# TVS Varistor, 14 V, 16 V, AV Series, 40 V, 1812 [4532 Metric], Multilayer Varistor (MLV) ![Product image](https://novapart.co/image/farnell:3380641RL/) **URL**: https://novapart.co/products/AV14K1812801NIR1/tvs-varistor-14-v-16-av-series-40-1812-4532-metric **SKU**: AV14K1812801NIR1 **Manufacturer**: BOURNS **Category**: Circuit Protection || TVS - Transient Voltage Suppressors || TVS Varistors **Price**: €0.2440 **Stock**: 1000+ **Lead Time**: 64 days (indicative) ## Specifications | Parameter | Value | |---|---| | Svhc | No SVHC (04-Feb-2026) | | Product Range | AV Series | | Varistor Type | Multilayer Varistor (MLV) | | Voltage Rating Vac | 14V | | Voltage Rating Vdc | 16V | | Varistor Case Style | 1812 [4532 Metric] | | Clamping Voltage Vc Max | 40V | | Peak Energy (10/1000Us) | 2.4J | | Operating Temperature Max | 125°C | | Operating Temperature Min | -55°C | | Peak Surge Current @ 8/20Μs | 800A | | Automotive Qualification Standard | AEC-Q200 | ## Datasheet 📄 [Download PDF](https://novapart.co/datasheet/farnell:3380641RL/) ## **Features** - Formerly a KEKOV/\)2ICON product - ■ Five model sizes available - 0805, 1206, 1210, 1812 and 2220 - Supply voltages: 12 V, 24 V and 42 V - Broad range of current and energy handling capabilities - Low clamping voltage - Vc - Non-sensitive to mildly activated fluxes - Non-plastic coating for better flammability rating - +125 °C maximum continuous operating temperature - Load Dump Energy up to 50 J available upon request - RoHS compliant* - AEC-Q200 Grade 1 upon request ## **AV Series – Automotive Grade Varistors** BOURNS ~~Ei~~ ## ~~**General Information**~~ Almost all electronic systems in an automobile, e.g., anti-lock brake system, direct ignition system, airbag control system, wiper motors, etc. are susceptible to damage from destructive voltage transients. Bourns[®] AV Series multilayered varistors are transient suppressors with temperature independent suppression characteristics enabling protection from -55 °C to +125 °C. AV Series varistors offer excellent transient energy distribution. AV varistors require significantly less space and pad area than silicon TVS diodes, offering greater circuit board layout flexibility for the designer. ## ~~**Additional Information**~~ Click these links for more information: PRODUCT TECHNICAL INVENTORY SAMPLES CONTACT SELECTOR LIBRARY ## ~~**Multilayered Varistor Symbol**~~ ## ~~**Absolute Maximum Ratings**~~ **==> picture [317 x 153] intentionally omitted <==** **----- Start of picture text -----**
|||| |---|---|---| |Parameter|Value|Units| |Continuous:| |Steady State Applied Voltage| |DC Voltage Range (Vdc)|16 to 56|V| |Transient:| |Load Dump Energy (WLD)|1 to 25 **|J| |Jump Start Capability (5 minutes), (Vjump)|24.5 to 65|V| |Peak Single Pulse Surge Current, 8/20 μs Waveform (Imax)|120 to 1200|A| |Single Pulse Surge Energy, 10/1000 μs Waveform (Wmax)|0.3 to 30|J| |Operating Ambient Temperature|-55 to +125|°C| |Storage Temperature Range|-55 to +150|°C| |Threshold Voltage Temperature Coefficient|< +0.05|%/°C| |Response Time|< 2|ns| |Climatic Category|55 / 125 / 56| **----- End of picture text -----**
** Load Dump Energy (WLD) up to 50 J available upon request. ## _**U**_ ## ~~**Index**~~ **==> picture [155 x 216] intentionally omitted <==** **----- Start of picture text -----**
||| |---|---| |Features ......................................................|1| |General Information ....................................|1| |Multilayered Varistor Symbol ......................|1| |Absolute Maximum Ratings ........................|1| |Device Ratings ............................................|2| |Product Dimensions ....................................|3| |How to Order ...............................................|4| |Typical Part Marking ...................................|4| |Protection Level/| |Pulse Rating Curves ................................|5-7| |Soldering Pad Configuration .......................|8| |Packaging Specifications ........................|8-9| |Soldering Recommendations for| |SMD Components ................................10-12| |Reliability - Lifetime ...................................|13| |Reliability Testing Procedures ..............|14-15| |Terminology ...............................................|16| |Legal Disclaimer........................................|17| **----- End of picture text -----**
**Asia-Pacific:** Tel: +886-2 2562-4117 • Email: asiacus@bourns.com **EMEA:** Tel: +36 88 885 877 • Email: eurocus@bourns.com **The Americas:** Tel: +1-951 781-5500 • Email: americus@bourns.com **www.bourns.com** *RoHS Directive 2015/863, Mar 31, 2015 and Annex. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. **WARNING Cancer and Reproductive Harm** www.P65Warnings.ca.gov ## **AV Series – Automotive Grade Varistors** ~~**Device Ratings**~~ **==> picture [506 x 41] intentionally omitted <==** **----- Start of picture text -----**
Model Vrms Vdc @ 1 mAVn V5 min.jump Vc 8/20 μsIc 8/20 μsImax 10/1000 μsWmax 10 timesWLD max.P @ 1 kHzCtyp
V V V V V A A J J W nF
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|**Model**|**Vrms**|**Vdc**|**Vn**
**@ 1 mA**|**Vjump**
**5 min.**|**Vc**|**Ic**
**8/20 μs**|**Imax**
**8/20 μs**|**Wmax**
**10/1000 μs**|**WLD**
**10 times**|**P**
**max.**|**Ctyp**
**@ 1 kHz**| |---|---|---|---|---|---|---|---|---|---|---|---| ||V|V|V|V|V|A|A|J|J|W|nF| ||||||||||||| |**12 V Power Supply**|||||||||||| |AV 14 K 0805 121|14|16|24|24.5|40|1|120|0.3|1|0.008|0.44| |AV 14 K 1206 201|14|16|24|24.5|40|1|200|0.6|1.5|0.008|1.00| |AV 14 K 1210 401|14|16|24|24.5|40|2.5|400|1.6|3|0.010|2.23| |AV 14 K 1812 801|14|16|24|24.5|40|5|800|2.4|6|0.015|4.50| |AV 14 K 2220 122|14|16|24|24.5|40|10|1200|5.8|12|0.030|10.00| |AV 17 K 0805 121|17|20|27|30|44|1|120|0.5|1|0.008|0.37| |AV 17 K 1206 201|17|20|27|30|44|1|200|1.1|1.5|0.008|0.81| |AV 17 K 1210 401|17|20|27|30|44|2.5|400|1.8|3|0.010|2.00| |AV 17 K 1812 801|17|20|27|30|44|5|800|2.9|6|0.015|3.80| |AV 17 K 2220 122|17|20|27|30|44|10|1200|7.2|12|0.030|8.00| |**24 V Power Supply**|||||||||||| |AV 20 K 1206 201|20|26|33|30|54|1|200|1.6|1.5|0.008|0.78| |AV 20 K 1210 401|20|26|33|30|54|2.5|400|1.9|3|0.010|1.65| |AV 20 K 1812 801|20|26|33|30|54|5|800|3.0|6|0.015|3.30| |AV 20 K 2220 122|20|26|33|30|54|10|1200|8.0|12|0.030|7.00| |AV 30 K 1206 201|30|34|47|50|77|1|200|2.0|1.5|0.008|0.53| |AV 30 K 1210 401|30|34|47|50|77|2.5|400|2.3|3|0.010|1.10| |AV 30 K 1812 801|30|34|47|50|77|5|800|3.8|6|0.015|2.20| |AV 30 K 2220 122|30|34|47|50|77|10|1200|10.0|12|0.030|6.50| |**42 V Power Supply**|||||||||||| |AV 40 K 1206 201|40|56|68|65|110|1|200|2.2|1.5|0.008|0.40| |AV 40 K 1210 401|40|56|68|65|110|2.5|400|2.6|3|0.010|0.90| |AV 40 K 1812 801|40|56|68|65|110|5|800|4.8|6|0.015|1.80| |AV 40 K 2220 122|40|56|68|65|110|10|1200|10.5|12|0.030|5.50| Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Product Dimensions**~~ **==> picture [330 x 38] intentionally omitted <==** **----- Start of picture text -----**
Dimension
Size
L W t (Max.)
2.0 ± 0.25 1.25 ± 0.20 1.0
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|**Size**|**Dimension**|**Dimension**|**Dimension**|**Dimension**|**Dimension**| |---|---|---|---|---|---| ||**L**||**W**||**t**(Max.)| ||2.0 ± 0.25||1.25 ± 0.20||1.0| |0805||(.079 ± .010)||(.049 ± .008)|(.039)| |1206||3.2 ± 0.30
(.126 ± .012)||1.60 ± 0.20
(.063 ± .008)|1.2
(.047)| |1210||3.2 ± 0.30
(.126 ± .012)||2.50 ± 0.25
(.098 ± .010)|1.3
(.051)| |1812||4.7 ± 0.40
(.185 ± .016)||3.20 ± 0.30
(.126 ± .012)|1.3
(.051)| |2220||5.7 ± 0.50
(.224 ± .020)||5.00 ± 0.40
(.197 ± .016)|1.4
(.055)| **==> picture [100 x 105] intentionally omitted <==** **----- Start of picture text -----**
0.5 ± 0.25
(.020 ± .010)
W
t
L
MM
DIMENSIONS:
(INCHES)
**----- End of picture text -----**
Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** |~~**How to Order**~~
**AV20K1210401NIR1**
Series Designator
AV = AV Series
Maximum Continuous Working Voltage (Vrms)
• 20 = 20 VAC
Vn Tolerance
K = 10 %
Model Size
• 0805
• 1206
• 1210
• 1812
• 2220
Maximum Surge Current
• 121 = 120 A
• 401 = 400 A • 122 = 1200 A
• 201 = 200 A
• 801 = 800 A
End Terminations
• NI = NiSn barrier type end terminations suitable for Pb and Pb-free reflow soldering
Packaging
R1 = 180 mm (7-inch) reel
R2 = 330 mm (13-inch) reel
**Instructions for Creating Orderable Part Number:**
1) Start with base part number in characteristics table (example:AV20K1210401).
2) Add End Termination: NI standard (example part number becomes
AV20K1210401NI).
3) Add Packaging: (example part number becomes AV20K1210401NIR1).
4) Part number can have no spaces or lower case letters.|~~**Typical Part Marking**~~
No marking.| |---|---| Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Seri** ~~**e**~~ **s – Automotive Grade Varistors** ## ~~**Protection Level**~~ **Model Size 0805 - (AV 14 K 0805 121 ~ AV 17 K 0805 121)** **==> picture [182 x 227] intentionally omitted <==** **----- Start of picture text -----**
400
200
100
80
60
40 17
14
20
17 14
10
8
6
4
10 [-5] 10 [-4] 10 [-3] 10 [-2] 10 [-1] 10 [0] 10 [1] 10 [2] 10 [3] 10 [4]
I (Amps)
V (Volts)
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## ~~**Pulse Rating Curves**~~ ## **Model Size 0805 - (AV 14 K 0805 121 ~ AV 17 K 0805 121)** **==> picture [246 x 157] intentionally omitted <==** **----- Start of picture text -----**
10 [3]
5
10 [2]
5
10 [1]
5
10 [0]
5
10 [-1]
5
10 [-2]
10 [1] 5 10 [2] 5 10 [3] 5 10 [4]
tp (µs)
6
10
3
4
10
10
10
2
5
10
10
1x
2
8
(Amps)
Imax
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**Model Size 1206 - (AV 14 K 1206 201 ~ AV 40 K 1206 201)** **==> picture [184 x 227] intentionally omitted <==** **----- Start of picture text -----**
400
200
100
80 40
60 30
40
40 30 20 17
20 14
20
17 14
10
8
6
4
10 [-5] 10 [-4] 10 [-3] 10 [-2] 10 [-1] 10 [0] 10 [1] 10 [2] 10 [3] 10 [4]
I (Amps)
V (Volts)
**----- End of picture text -----**
## **Model Size 1206 - (AV 14 K 1206 201 ~ AV 40 K 1206 201)** **==> picture [249 x 158] intentionally omitted <==** **----- Start of picture text -----**
10 [3]
5
10 [2]
5
10 [1]
5
10 [0]
5
10 [-1]
5
10 [-2]
10 [1] 5 10 [2] 5 10 [3] 5 10 [4]
tp (µs)
106
105 4
10
10
3102
10
2
1x
8
Imax (Amps)
**----- End of picture text -----**
Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Protection Level**~~ **Model Size 1210 - (AV 14 K 1210 401 ~ AV 40 K 1210 401)** **==> picture [184 x 228] intentionally omitted <==** **----- Start of picture text -----**
400
200
100
80 40
60 30
40
40 30 20 17
20 14
20
17 14
10
8
6
4
10 [-5] 10 [-4] 10 [-3] 10 [-2] 10 [-1] 10 [0] 10 [1] 10 [2] 10 [3] 10 [4]
I (Amps)
V (Volts)
**----- End of picture text -----**
## ~~**Pulse Rating Curves**~~ ## **Model Size 1210 - (AV 14 K 1210 401 ~ AV 40 K 1210 401)** **==> picture [249 x 158] intentionally omitted <==** **----- Start of picture text -----**
10 [4]
5
10 [3]
5
10 [2]
5
10 [1]
5
10 [0]
5
10 [-1]
10 [1] 5 10 [2] 5 10 [3] 5 10 [4]
tp (µs)
6
5
10
10 104
3 10
10 2
10
2
1x
Imax (Amps) 8
**----- End of picture text -----**
**Model Size 1812 - (AV 14 K 1812 801 ~ AV 40 K 1812 801)** **==> picture [184 x 228] intentionally omitted <==** **----- Start of picture text -----**
400
200
100
80 40
60 30
40
40 30 20 17
20 14
20
17 14
10
8
6
4
10 [-5] 10 [-4] 10 [-3] 10 [-2] 10 [-1] 10 [0] 10 [1] 10 [2] 10 [3] 10 [4]
I (Amps)
V (Volts)
**----- End of picture text -----**
## **Model Size 1812 - (AV 14 K 1812 801 ~ AV 40 K 1812 801)** **==> picture [249 x 158] intentionally omitted <==** **----- Start of picture text -----**
10 [4]
5
10 [3]
5
10 [2]
5
10 [1]
5
10 [0]
5
10 [-1]
10 [1] 5 10 [2] 5 10 [3] 5 10 [4]
tp (µs)
10 6
105
104
103
102
10
2
1x
8
Imax (Amps)
**----- End of picture text -----**
Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Protection Level**~~ ## ~~**Pulse Rating Curves**~~ **Model Size 2220 - (AV 14 K 2220 122 ~ AV 40 K 2220 122) Model Size 2220 - (AV 14 K 2220 122 ~ AV 40 K 2220 122)** **==> picture [472 x 229] intentionally omitted <==** **----- Start of picture text -----**
400 10 [4]
5
10 [3]
200
5
10 [2]
100 5
80 40
10 [1]
60 30 5
40
40 30 20 17 10 [0]
14 5
20 20 17 10 [-1]
14 10 [1] 5 10 [2] 5 10 [3] 5 10 [4]
tp (µs)
10
8
6
4
10 [-5] 10 [-4] 10 [-3] 10 [-2] 10 [-1] 10 [0] 10 [1] 10 [2] 10 [3] 10 [4]
I (Amps)
4
106
5
3
10 10
10 10
2
10
1x
2
8
Imax (Amps)
V (Volts)
**----- End of picture text -----**
Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Soldering Pad Configuration**~~ **==> picture [367 x 84] intentionally omitted <==** **----- Start of picture text -----**
0.5 ± 0.25 B C B
(.020 ± .010)
W
A A MM
DIMENSIONS:
(INCHES)
t
L
D
**----- End of picture text -----**
**==> picture [506 x 32] intentionally omitted <==** **----- Start of picture text -----**
Dimension
Size
L W t (Max.) A (Max.) B C D
**----- End of picture text -----**
|**Size**|**Dimension**|**Dimension**|**Dimension**|**Dimension**|**Dimension**|**Dimension**|**Dimension**|**Dimension**|**Dimension**| |---|---|---|---|---|---|---|---|---|---| ||**L**||**W**||**t**(Max.)|**A**(Max.)|**B**|**C**|**D**| ||||||||||| |0805||2.0 ± 0.25
(.079 ± .010)||1.25 ± 0.20
(.049 ± .008)|1.1
(.043)|1.4
(.055)|1.2
(.047)|1.0
(.039)|3.4
(.134)| |1206||3.2 ± 0.30
(.126 ± .012)||1.60 ± 0.20
(.063 ± .008)|1.6
(.063)|1.8
(.071)|1.2
(.047)|2.1
(.083)|4.5
(.177)| |1210||3.2 ± 0.30
(.126 ± .012)||2.50 ± 0.25
(.984 ± .010)|1.8
(.071)|2.8
(.110)|1.2
(.047)|2.1
(.083)|4.5
(.177)| |1812||4.7 ± 0.40
(.185 ± .016)||3.20 ± 0.30
(.126 ± .012)|1.9
(.075)|3.6
(.142)|1.5
(.059)|3.2
(.126)|6.2
(.244)| |2220||5.7 ± 0.50
(.224 ± .020)||5.00 ± 0.40
(.197 ± .016)|1.9
(.075)|5.5
(.217)|1.5
(.059)|4.2
(.165)|7.2
(.283)| ## ~~**Packaging Specifications**~~ Conforms to IEC Publication 286-3 Ed. 4: 2007-06 ## **Tape** **==> picture [330 x 151] intentionally omitted <==** **----- Start of picture text -----**
0.6 4 ± 0.1
MAX. (.024) (.157 ± .004) DIA. 1.75 ± 0.1
10 ° MAX. P2 (.059 +.004/-0)1.5 +0.1/-0 (.069 ± .004)
COVER W +0.3/-0.1
TAPE (W +.012/-.004)
E2
0.1 B1
MAX. (.004) (NOTE A) A0 D1 B0 F ± 0.05
T2 K0 (P1 P1 ±± .004) 0.1 (F ± .002)
(NOTE A)
8 12
20 ° MAX: W = &
10 ° MAX: W > (.315)12 (.472) DIMENSIONS: (INCHES)MM
(.472)
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Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Packaging Specifications (Continued)**~~ ## **Reel** **==> picture [385 x 168] intentionally omitted <==** **----- Start of picture text -----**
2 ± 0.5
21 ± 0.8
(.079 ± .020)
(.827 ± .315)
W1
12.80 + 0.5
(.504 + .020)
A - 2.0
(A - 0.79)
60 + 2.0 MM
(2.362 + .079) DIMENSIONS: (INCHES)
W2
W3
**----- End of picture text -----**
**==> picture [506 x 32] intentionally omitted <==** **----- Start of picture text -----**
Model Size Model Size
Dimension Dimension
0805 1206 1210 1812 2220 0805 1206 1210 1812 2220
**----- End of picture text -----**
|**Dimension**|**Model Size**|**Model Size**|**Model Size**|**Model Size**|**Model Size**|**Model Size**|**Model Size**|**Model Size**|**Dimension**|**Model Size**|**Model Size**|**Model Size**|**Model Size**|**Model Size**| |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| ||**0805**||**1206**||**1210**|**1812**|**2220**|||**0805**|**1206**|**1210**|**1812**|**2220**| |||||||||||||||| |A0|1.6
(.063)|||1.9
(.075)|2.9
(.114)|3.75
(.148)|5.6
(.220)||F|3.5
(.138)|||5.5
(.217)|| |B0|2.4
(.094)|||3.75
(.148)|3.7
(.146)|5
(.197)|6.25
(.246)||W|8.0
(.315)|||12.0
(.480)|| |K0 MAX.||1.1|||1.8
(.071)|2
(.079)|||T2 MAX.|3.5
(.138)|||6.5
(.256)|| |||(.043)||||||||||||| |B1 MAX.||||4.35
(.171)||8.2
(.323)|||W1|8.4 ± 1.5
(.331 ± .059)|||12.
(.488|4 ± 2
± .079)| |D1 DIA. MIN.||||0.3
(.012)||1.5
(.059)|||W2 MAX.|14.4
(.567)|||18.4
(.724)|| |E2 MIN.||||6.25
(.246)||10.25
(.404)|||W3|7.9 to 10.9
(.311 to .429)|||11.9 to 15.4
(.469 to .606)|| |P1||||4
(.157)||8
(.315)|||A DIA.|||180/330
(7.087/12.992)||| ## ~~**Packaging Quantities**~~ |**Series**|**Voltage Range (V)**|**Model Size**|**Model Size**|**Model Size**|**Model Size**|**Model Size**| |---|---|---|---|---|---|---| |||**0805**|**1206**|**1210**|**1812**|**2220**| |AV|14|3500|2500|2500|1000|1000| ||17|3500|2500|2500|1000|1000| ||20 to 40||2500|2500|1000|1000| Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Soldering Recommendations for SMD Components**~~ Popular soldering techniques used for surface mounted components are Wave and Infrared Reflow processes. Both processes can be performed with Pb-containing or Pb-free solders. The terminations for these soldering techniques are NiSn Barrier Type End Terminations. |**End Termination**|**Designation**|**Recommended and Suitable for**|**RoHS Compliant**| |---|---|---|---| |NiSn End Termination|AV Series ...Ni|Pb-containing and Pb-free soldering|Yes| ## **Wave Soldering** This process is generally associated with discrete components mounted on the underside of printed circuit boards, or for large top-side components with bottom-side mounting tabs to be attached, such as the frames of transformers, relays, connectors, etc. SMD varistors to be wave soldered are first glued to the circuit board, usually with an epoxy adhesive. When all components on the PCB have been positioned and an appropriate amount of time is allowed for adhesive curing, the completed assembly is then placed on a conveyor and run through a single, double wave process. ## **Infrared Reflow Soldering** These reflow processes are typically associated with top-side component placement. This technique utilizes a mixture of adhesive and solder compounds (and sometimes fluxes) that are blended into a paste. The paste is then screened onto PCB soldering pads specifically designed to accept a particular sized SMD component. The recommended solder paste wet layer thickness is 100 to 300 μm. Once the circuit board is fully populated with SMD components, it is placed in a reflow environment, where the paste is heated to slightly above its eutectic temperature. When the solder paste reflows, the SMD components are attached to the solder pads. ## **Solder Fluxes** Solder fluxes are generally applied to populated circuit boards to keep oxides from forming during the heating process and to facilitate the flowing of the solder. Solder fluxes can be either a part of the solder paste compound or separate materials, usually fluids. Recommended fluxes are: - non-activated (R) fluxes, whenever possible - mildly activated (RMA) fluxes of class L3CN - class ORLO Activated (RA), water soluble or strong acidic fluxes with a chlorine content > 0.2 wt. % are NOT RECOMMENDED. The use of such fluxes could create high leakage current paths along the body of the varistor components. When a flux is applied prior to wave soldering, it is important to completely dry any residual flux solvents prior to the soldering process. ## **Thermal Shock** To avoid the possibility of generating stresses in the varistor chip due to thermal shock, a preheat stage to within 100 °C of the peak soldering process temperature is recommended. Additionally, SMD varistors should not be subjected to a temperature gradient greater than 4 °C/sec., with an ideal gradient being 2 °C/sec. Peak temperatures should be controlled. Wave and Reflow soldering conditions for SMD varistors with Pb-containing solders are shown on the next page in Fig. 1 and 2 respectively, while Wave and Reflow soldering conditions for SMD varistors with Pb-free solders are shown in Fig. 1 and 3. Whenever several different types of SMD components are being soldered, each having a specific soldering profile, the soldering profile with the least heat and the minimum amount of heating time is recommended. Once soldering has been completed, it is necessary to minimize the possibility of thermal shock by allowing the hot PCB to cool to less than 50 °C before cleaning. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Soldering Recommendations for SMD Components (Continued)**~~ **==> picture [298 x 117] intentionally omitted <==** **==> picture [155 x 114] intentionally omitted <==** ## **Inspection Criteria** When Wave or Infrared Reflow processes are used, the inspection criteria to determine acceptable solder joints will depend on several key variables, principally termination material process profiles. ## **Pb-containing Wave and IR Reflow Soldering** Typical “before” and “after” soldering results for NiSn End Terminations can be seen in Fig. 4. NiSn sType varistors form a reliable electrical contact and metallurgical bond between the end terminations and the solder pads. The bond between these two metallic surfaces is exceptionally strong and has been tested by both vertical pull and lateral (horizontal) push tests. The results exceed established industry standards for adhesion. **==> picture [73 x 8] intentionally omitted <==** **----- Start of picture text -----**
NiSn End Terminations
**----- End of picture text -----**
**==> picture [208 x 111] intentionally omitted <==** **==> picture [184 x 18] intentionally omitted <==** **----- Start of picture text -----**
Fig. 4 Soldering Criteria for Wave and IR Reflow
Pb-containing Soldering
**----- End of picture text -----**
**==> picture [73 x 8] intentionally omitted <==** **----- Start of picture text -----**
NiSn End Terminations
**----- End of picture text -----**
**==> picture [210 x 111] intentionally omitted <==** **==> picture [184 x 18] intentionally omitted <==** **----- Start of picture text -----**
Fig. 5 Soldering Criteria for Wave and IR Reflow
Pb-free Soldering
**----- End of picture text -----**
## **Pb-free Wave and IR Reflow Soldering** Solder forms a metallurgical junction with the entire volume of the end termination, i.e., it diffuses from pad to end termination across the inner side, forming a “mirror” or “negative meniscus. The height of the solder penetration can be clearly seen on the end termination and is always 30 % higher than the chip height. Since NiSn end terminations on Bourns[®] chips do not require the use of sometimes problematic nickel and tin-alloy electroplating processes, these varistors are truly considered environmentally friendly. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Soldering Recommendations for SMD Components (Continued)**~~ ## **Solder Test and Retained Samples** Reflow soldering test based on J-STD-020D.1 and soldering test by dipping based on IEC 60068- 2 for Pb-free solders are performed on each production lot as shown in the following chart. Test results and accompanying samples are retained for a minimum of two (2) years. The solderability of a specific lot can be checked at any time within this period, should a customer require this information. **==> picture [506 x 28] intentionally omitted <==** **----- Start of picture text -----**
Test Resistance to Flux Solderability Static Leaching (Simula- Dynamic Leaching (Simu-
tion of Reflow Soldering) lation of Wave Soldering)
**----- End of picture text -----**
|**Test**|**Resistance to Flux**|**Solderability**|**Static Leaching (Simula-**
**tion of Reflow Soldering)**|**Dynamic Leaching (Simu-**
**lation of Wave Soldering)**| |---|---|---|---|---| |||||| |Solderingmethod|Dipping|Dipping|Dipping|Dippingwith Agitation| |Flux|L3CN,ORL0|L3CN,ORL0,R|L3CN,ORL0,R|L3CN,ORL0,R| |Pb Solder|62Sn / 36Pb / 2Ag|||| |Pb Soldering
Temperature(°C)|235 ± 5|235 ± 5|260 ± 5|235 ± 5| |Pb-Free Solder|Sn96 / Cu0,4-0,8 / 3-4Ag|||| |Pb-Free Soldering
Temperature(°C)|250 ± 5|250 ± 5|280 ± 5|250 ± 5| |SolderingTime(sec.)|2|210|10|> 15| |Burn-in Conditions|Vdcmax,48 hours|-|-|-| |Acceptance Criterion|dVn < 5 %, idcmust stay
unchanged|> 95 % of end termination
must be covered by solder|> 95 % of end termination
must be intact and
covered by solder|> 95 % of end termination
must be intact and
covered by solder| ## **Rework Criteria - Soldering Iron** Unless absolutely necessary, the use of soldering irons is NOT recommended for reworking varistor chips. If no other means of rework is available, the following criteria must be strictly followed: - Do not allow the tip of the iron to directly contact the top of the chip - Do not exceed the following soldering iron specifications: Output Power .......................................30 Watts Maximum Temperature of Soldering Iron Tip .......280 °C Maximum Soldering Time .....................................10 Seconds Maximum ## **Storage Conditions** SMD varistors should be used within 1 year of purchase to avoid possible soldering problems caused by oxidized terminals. The storage environment should be controlled, with humidity less than 40 % and temperature between -25 and +45 °C. Varistor chips should always be stored in their original packaged unit. When varistor chips have been in storage for more than 1 year, and when there is evidence of solderability difficulties, Bourns can “refresh” the terminations to eliminate these problems. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Reliability - Lifetime**~~ ## **Pb-free Wave and IR Reflow Soldering** In general, **reliability** is the ability of a component to perform and maintain its functions in routine circumstances, as well as in hostile or unexpected circumstances. The Mean life of the AV series is a function of: - Factor of Applied Voltage - Ambient Temperature Mean life is closely related to Failure rate (formula). Mean life (ML) is the arithmetic mean (average) time to failure of a component. **Failure rate** is the frequency with which an engineered system or component fails, expressed, for example, in failures per hour. Failure rate is usually time dependent, and an intuitive corollary is that the rate changes over time versus the expected life cycle of a system. ## **Failure rate formula - calculation** **==> picture [55 x 20] intentionally omitted <==** ## **FAV - Factor of Applied Voltage** FAV =[V] apl Vmax Vapl .............applied voltage Vmax ...........maximum operating voltage ## **AV Series Mean Life on Arrhenius Model** **==> picture [225 x 176] intentionally omitted <==** **----- Start of picture text -----**
10 [8]
Years
10 [7] 1000
10 [6] 100
10 [5] 10
10 [4] 1
120 100 80 60 40 20
Ta (°C)
Mean Life (ML)
**----- End of picture text -----**
Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Reliability Testing Procedures**~~ Varistor test procedures comply with CECC 42200, IEC 1051-1/2 and AEC-Q200. Test results are available upon customer request. Special tests can be performed upon customer request. **==> picture [505 x 35] intentionally omitted <==** **----- Start of picture text -----**
Condition to be
Reliability Parameter Test Tested According to Satisfied after
Testing
**----- End of picture text -----**
|**Reliability Parameter**|**Test**|**Tested According to**|**Condition to be**
**Satisfied after**
**Testing**| |---|---|---|---| ||||| |**AC/DC Bias Reliability**|AC/DC Life Test|CECC 42200, Test 4.20 or
IEC 1051-1, Test 4.20,
AEC-Q200 Test 8 - 1000 h at UCT||δVn (1 mA)| < 10 %| |**Pulse Current Capability**|Imax 8/20 μs|CECC 42200, Test C 2.1 or
IEC 1051-1, Test 4.5
10 pulses in the same direction at
2pulsesper minute at maximumpeak current for 10pulses||δVn (1 mA)| < 10 %
no visible damage| |**Pulse Energy Capability**|Wmax 10/1000 μs|CECC 42200, Test C 2.1 or
IEC 1051-1, Test 4.5
10 pulses in the same direction at
1 pulse every 2 minutes at maximum peak current for 10
pulses||δVn (1 mA)| < 10 %
no visible damage| |**WLD Capability**|WLD x 10|ISO 7637, Test pulse 5, 10 pulses at rate of 1 per minute||δVn (1 mA)| < 15 %
no visible damage| |**Vjump Capability**|Vjump 5 min.|Increase of supply voltage to V ≥ Vjump for 1 minute||δVn (1 mA)| < 15 %
no visible damage| |**Environmental and**
**Storage Reliability**|Climatic Sequence|CECC 42200, Test 4.16 or
IEC 1051-1, Test 4.17
a) Dry heat, 16h, UCT, Test Ba, IEC 68-2-2
b) Damp heat, cyclic, the first cycle: 55 °C, 93 % RH, 24 h,
Test Db 68-2-4
c) Cold, LCT, 2 h, Test Aa, IEC 68-2-1
d) Damp heat cyclic, remaining 5 cycles: 55 °C, 93 % RH,
24 h/cycle, Test Bd, IEC 68-2-30||δVn (1 mA)| < 10 %| ||Thermal Shock|CECC 42200, Test 4.12, Test Na, IEC 68-2-14,
AEC-Q200 Test 16,5||δVn (1 mA)| < 10 %
no visible damage| ||Steady State
Damp Heat|CECC 42200, Test 4.17, Test Ca, IEC 68-2-3,
AEC-Q200 Test 6, 56 days, 40 °C, 93 % RH,
AEC-Q200 Test 7: Bias,Rh,T all at 85.||δVn (1 mA)| < 10 %| ||Storage Test|IEC 68-2-2, Test Ba, AEC-Q200 Test 3, 1000 h at maximum
storage temperature||δVn (1 mA)| < 5 %| ||_Continued on Next Page_||| Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Reliability Testing Procedures (Continued)**~~ **==> picture [505 x 35] intentionally omitted <==** **----- Start of picture text -----**
Condition to be
Reliability Parameter Test Tested According to Satisfied after
Testing
**----- End of picture text -----**
|**Reliability Parameter**|**Test**|**Tested According to**|**Condition to be**
**Satisfied after**
**Testing**| |---|---|---|---| ||||| |**Mechanical Reliability**|Solderability|CECC 42200, Test 4.10.1, Test Ta, IEC 68-2-20 solder bath
and reflow method|Solderable at
shipment and after
2 years of storage,
criteria: >95% must
be covered by solder
for reflow meniscus| ||Resistance to
SolderingHeat|CECC 42200, Test 4.10.2, Test Tb, IEC 68-2-20 solder bath
nad reflow method||δVn (1 mA)| < 5 %| ||Terminal Strength|JIS-C-6429, App. 1, 18N for 60 sec. - same for AEC-Q200
Test 22|No visual damage| ||Board Flex|JIS-C-6429, App. 2, 2 mm min.
AEC-Q200 test 21 - Board flex: 2 mm flex min.||δVn (1 mA)| < 2 %
No visible damage| ||Vibration|CECC 42200, Test 4.15, Test Fc, IEC 68-2-6,
AEC-Q200 Test 14
Frequency range 10 to 55 Hz (AEC: 10-2000 Hz)
Amplitude 0.75 m/s2or 98 m/s2(AEC: 5 g for 20 minutes) To-
tal duration 6 h (3x2 h) (AEC: 12 cycles each of 3 directions)
Waveshape - half sine||δVn (1 mA)| < 2 %
No visible damage| ||Mechanical Shock|CECC 42200, Test 4.14, Test Ea, IEC 68-2-27, AEC-Q200
Test 13.
Acceleration = 490 m/s2(AEC: MIL-STD-202-Method 213),
Pulse duration = 11 ms,
Waveshape - half sine;Number of shocks = 3x6||δVn (1 mA)| < 10 %
No visible damage| |**Electrical Transient**
**Conduction**|ISO-7637-1 Pulses|AEC-Q200 Test 30: Test pulses 1 to 3.
Also other pulses - freestyle.||δVn (1 mA)| < 10 %
No visible damage| Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ## **AV Series – Automotive Grade Varistors** ## ~~**Terminology**~~ |**Term**
**Symbol**
**Definition**| |---| |Rated AC Voltage .........................Vrms..................Maximum continuous sinusoidal AC voltage (<5 % total harmonic distortion) which may be| |applied to the component under continuous operation conditions at +25 °C| |Rated DC Voltage .........................Vdc....................Maximum continuous DC voltage (<5 % ripple) which may be applied to the component| |under continuous operating conditions at +25 °C| |Supply Voltage..............................V ........................The voltage by which the system is designated and to which certain operating| |characteristics of the system are referred; Vrms= 1.1 x V| |Leakage Current ...........................Idc......................The current passing through the varistor at Vdcand at +25 °C or at any other specified| |temperature| |Varistor Voltage ............................Vn......................Voltage across the varistor measured at a given reference current (In)| |Reference Current ........................In.......................Reference current = 1 mA DC| |Clamping Voltage .........................Vc......................The peak voltage developed across the varistor under standard atmospheric conditions,| |Protection Level
when passing an 8/20 μs class current pulse| |Class Current................................Ic........................A peak value of current which is 1/10 of the maximum peak current for 100 pulses at two| |per minute for the 8/20 μs pulse| |Voltage Clamping Ratio ................Vc/Vapp.............A figure of merit measure of the varistor clamping effectiveness as defined by the symbols
Vc/Vapp, where (Vapp= Vrmsor Vdc)| |Jump Start Transient ....................Vjump.................The jump start transient results from the temporary application of an overvoltage in excess
of the rated battery voltage. The circuit power supply may be subjected to a temporary| |overvoltage condition due to the voltage regulation failing or it may be deliberately generated| |when it becomes necessary to boost start the car.| |Rated Single Pulse .......................Wmax.................Energy which may be dissipated for a single 10/1000 μs pulse of a maximum rated| |Transient Energy
current, with rated AC voltage or rated DC voltage also applied, without causing device| |failure| |Load Dump Transient ...................WLD ..................Load Dump is a transient which occurs in automotive environments. It is an exponentially| |decaying positive voltage which occurs in the event of a battery disconnect while the alter-| |nator is still generating charging current with other loads remaining on the alternator circuit| |at the time of battery disconnect.| |Rated Peak Single Pulse ..............Imax...................Maximum peak current which may be applied for a single 8/20 μs pulse, with rated line| |Transient Current
voltage also applied, without causing device failure| |Rated Transient Average ..............P ........................Maximum average power which may be dissipated due to a group of pulses occurring| |Power Dissipation
within a specified isolated time period, without causing device failure at 25 °C| |Capacitance..................................C........................Capacitance between two terminals of the varistor measured @ 1 kHz| |Non-linearity Exponent .................α........................A measure of varistor nonlinearity between two given operating currents, Inand I1as| |described by I = k V exp(a), where:| |- k is a device constant,| |- I1< I < Inand| |- a log (I1/In)/log(V1/Vn) = 1/log (V1/Vn), where:| |- Iris reference current (1 mA) and Vnis varistor voltage| |- I1= 10 In, V1is the voltage measured at I1| |Response Time.............................tr ........................The time lag between application of a surge and varistor’s “turn-on” conduction action| |Varistor Voltage Temperature .......TC .....................(Vn@ 85 °C - Vn@ 25 °C) / (Vn@ 25 °C) x 60 °C) x 100| |Coefficient| |Insulation Resistance ...................IR.......................Minimum resistance between shorted terminals and varistor surface| |Isolation Voltage ......................................................The maximum peak voltage which may be applied under continuous operating conditions| |between the varistor terminations and any conducting mounting surface| |Operating Temperature ..............................................The range of ambient temperature for which the varistor is designed to operate continuously| |as defined by the temperature limits of its climatic category| |Climatic Category .........................LCT/UCT/DHD ..LCT & UCT = Lower and Upper Category Temperature - the minimum and maximum| |ambient temperatures for which a varistor has been designed to operate continuously.| |DHD = Dump Heat Test Duration| |Storage Temperature ...............................................Storage temperature range without voltage applied| |Current/Energy Derating..........................................Derating of maximum values when operated above UCT| ## REV. D 09/20 Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. ® ## **Legal Disclaimer Notice** This legal disclaimer applies to purchasers and users of Bourns[®] products manufactured by or on behalf of Bourns, Inc. and Unless otherwise expressly indicated in writing, Bourns[®] products and data sheets relating thereto are subject to change and complete before placing orders for Bourns[®] products. The characteristics and parameters of a Bourns[®] product set forth in its data sheet are based on laboratory conditions, and statements regarding the suitability of products for certain types of applications are based on Bourns’ knowledge of typical requirements in generic applications. The characteristics and parameters of a Bourns[®] product in a user application may ® product with other components ® the actual performance of the Bourns[®] ® product as meeting the requirements of a particular industry failure of an individual Bourns ® product to meet the requirements of such industry standard or particular qualification. Users of Bourns[®] products are responsible for ensuring compliance with safety-related requirements and standards applicable to Bourns[®] on a case-by-case basis, use of any Bourns[®] ® ® ® Bourns[®] ® standard products that are suitable for use in aircraft “Applications.” Unless expressly and specifically ® standard the user’s sole risk. and the user for which such Bourns[®] custom and the user regarding the use and level of also apply to such Bourns[®] custom products. ® custom products shall be negotiated on a case-by-case basis by Bourns are specially designed. Absent a written agreement between Bourns testing, the above provisions applicable to Bourns ® standard products shall Users shall not sell, transfer, export or re-export any Bourns[®] Bourns[®] regulations. Further, Bourns ® products and Bourns technology and technical data may not under any circumstance be exported or re-exported to countries subject to international sanctions or embargoes. 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