# TVS Diode, SM15T, Bidirectional, 28.2 V, 59 V, DO-214AB (SMC), 2 Pins
**URL**: https://novapart.co/products/SM15T33CAY/tvs-diode-sm15t-bidirectional-282-v-59-do-214ab
**SKU**: SM15T33CAY
**Manufacturer**: STMICROELECTRONICS
**Category**: Circuit Protection || TVS - Transient Voltage Suppressors || TVS Diodes
**Price**: €0.4030
**Stock**: 1000+
**Lead Time**: 127 days (indicative)
## Description
Product Range:SM15T Series; TVS Polarity:Bidirectional; Reverse Stand-Off Voltage Vrwm:28.2V; Clamping Voltage Vc Max:59V; Diode Case Style:DO-214AB; No. of Pins:2Pins; Breakdown Voltage Mi
## Specifications
| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| No. Of Pins | 2Pins |
| Tvs Polarity | Bidirectional |
| Product Range | SM15T |
| Qualification | AEC-Q101 |
| Diode Mounting | Surface Mount |
| Diode Case Style | DO-214AB (SMC) |
| Clamping Voltage Max | 59V |
| Reverse Standoff Voltage | 28.2V |
| Maximum Breakdown Voltage | 34.7V |
| Minimum Breakdown Voltage | 31.4V |
| Operating Temperature Max | 150°C |
| Peak Pulse Power Dissipation | 1.5kW |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:2327812/)
**SM15TY**
**==> picture [61 x 39] intentionally omitted <==**
## Automotive 1500 W Transil™
**==> picture [123 x 9] intentionally omitted <==**
**----- Start of picture text -----**
Datasheet − production data
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## **Features**
- Peak pulse power:
- 1500 W (10/1000 µs)
- 10 kW (8/20 µs)
- Stand-off voltage range: from 5.8 V to 70 V
- Unidirectional and bidirectional types
- Low leakage current:
- 0.2 µA at 25 °C
**==> picture [144 x 107] intentionally omitted <==**
**----- Start of picture text -----**
A
K
Unidirectional Bidirectional
SMC
(JEDEC DO-214AB)
**----- End of picture text -----**
- 1 µA at 85 °C
- Operating Tj max: 150 °C
- High power capability at Tjmax: – 1250 W (10/1000 µs)
- JEDEC registered package outline
- Resin meets UL 94, V0
- AEC-Q101 qualified
## **Complies with the following standards**
- ISO 10605, C = 150 pF - R = 330 Ω:
- 30 kV (air discharge)
- 30 kV (contact discharge)
-
- ISO 10605 - C = 330 pF, R = 330 Ω:
## **Description**
The SM15TY Transil series has been designed to protect sensitive automotive circuits against surges defined in ISO 7637-2 and against electrostatic discharges according to ISO 10605.
The Planar technology makes it compatible with high-end circuits where low leakage current and high junction temperature are required to provide reliability and stability over time. SM15TY are packaged in SMC (SMC footprint in accordance with IPC 7531 standard).
- 30 kV (air discharge)
- 30 kV (contact discharge)
- ISO 7637-2[(a)]
- Pulse 1: VS = -100 V
- Pulse 2a: VS = +50 V
- Pulse 3a: VS = -150 V
- Pulse 3b: VS = +100 V
- a. Not applicable to parts with stand-off voltage lower than the average battery voltage (13.5 V)
**TM** : Transil is a trademark of STMicroelectronics
1/12
March 2012
Doc ID 17865 Rev 3
This is information on a product in full production.
_www.st.com_
**Characteristics**
**SM15TY**
## **1 Characteristics**
**Table 1. Absolute maximum ratings (Tamb = 25** °C **)**
|**Table 1.**|**Absolute maximum ratings (Tamb = 25**°C**)**|**Absolute maximum ratings (Tamb = 25**°C**)**|**Absolute maximum ratings (Tamb = 25**°C**)**|||
|---|---|---|---|---|---|
|**Symbol**|**Parameter**|||**Value**|**Unit**|
|VPP|Peak pulse voltage|ISO 10605 (C = 330 pF, R = 330Ω):
Contact discharge
Air discharge
ISO 10605 (C = 150 pF, R = 330Ω):
Contact discharge
Air discharge||30
30
30
30|kV|
|PPP|Peak pulse power dissipation(1)||Tj initial= Tamb|1500|W|
|Tstg|Storage temperature range|||-65 to + 150|°C|
|Tj|Operating junction temperature range|||-40 to + 150|°C|
|TL|Maximum lead temperature for soldering during 10 s.|||260|°C|
1. For a surge greater than the maximum values, the diode will fail in short-circuit.
## **Figure 1. Electrical characteristics - definitions**
**==> picture [401 x 131] intentionally omitted <==**
**----- Start of picture text -----**
I I
Symbol VRM Parameter Stand-off voltage Unidirectional IF IPP
VBR Breakdown voltage
VIRMCL Leakage current @ VClamping voltage RM VCLVBR VRM VF V VCLVBR VRM IIRMR V
IαPPT Peak pulse currentVoltage temperature coefficient IRMIR IRMIR VRMVBR VCL
VF Forward voltage drop
RD Dynamic resistance IPP IPP Bidirectional
**----- End of picture text -----**
## **Figure 2. Pulse definition for electrical characteristics**
**==> picture [185 x 103] intentionally omitted <==**
**----- Start of picture text -----**
%IPP
100
Pulse waveform
50 tr = rise time (µs)
tp = pulse duration time (µs)
0 t
tr tp
**----- End of picture text -----**
2/12
Doc ID 17865 Rev 3
**SM15TY**
**Characteristics**
**Table 2. Electrical characteristics, typical values unless otherwise stated (Tamb = 25 °C)**
|**Order code**|**IRM max@VRM**|**IRM max@VRM**|**IRM max@VRM**|**VBR @IR (1)**|**VBR @IR (1)**|**VBR @IR (1)**|**VBR @IR (1)**|**VCL @IPP**
**10/1000 µs**|**VCL @IPP**
**10/1000 µs**|**RD**
**10/1000**
**µs**|**VCL @IPP**
**8/20 µs**|**VCL @IPP**
**8/20 µs**|**RD**
**8/20**
**µs**|α**T(2)**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||**25 °C **|**85 °C**||**min**|**typ**|**max**||**max**|||**max**|||**max**|
||**µA**||**V**|**V**|||**mA**|**V(3)**|**A(4)**|Ω|**V(3)**|**A(4)**|Ω|**10-4/**
**°C**|
|SM15T6V8AY/CAY|500|2000|5.8|6.45|6.8|7.14|10|10.5|143|0.023|13.4|746|0.008|5.7|
|SM15T7V5AY/CAY|250|1000|6.4|7.13|7.5|7.88|10|11.3|132|0.026|14.5|690|0.01|6.1|
|SM15T10AY/CAY|10|50|8.55|9.5|10|10.5|1|14.5|103|0.039|18.6|538|0.015|7.3|
|SM15T12AY/CAY|0.2|1|10.2|11.4|12|12.6|1|16.7|90|0.046|21.7|461|0.02|7.8|
|SM15T15AY/CAY|0.2|1|12.8|14.3|15|15.8|1|21.2|71|0.076|27.2|368|0.031|8.4|
|SM15T18AY/CAY|0.2|1|15.3|17.1|18|18.9|1|25.2|59.5|0.106|32.5|308|0.044|8.8|
|SM15T22AY/CAY|0.2|1|18.8|20.9|22|23.1|1|30.6|49|0.153|39.3|254|0.064|9.2|
|SM15T24AY/CAY|0.2|1|20.5|22.8|24|25.2|1|33.2|45|0.178|42.8|234|0.075|9.4|
|SM15T27AY/CAY|0.2|1|23.1|25.7|27|28.4|1|37.5|40|0.228|48.3|207|0.096|9.6|
|SM15T30AY/CAY|0.2|1|25.6|28.5|30|31.5|1|41.5|36|0.278|53.5|187|0.12|9.7|
|SM15T33AY/CAY|0.2|1|28.2|31.4|33|34.7|1|45.7|33|0.333|59|169|0.14|9.8|
|SM15T36AY/CAY|0.2|1|30.8|34.2|36|37.8|1|49.9|30|0.403|64.3|156|0.17|9.9|
|SM15T39AY/CAY|0.2|1|33.3|37.1|39|41.0|1|53.9|28|0.461|69.7|143|0.2|10|
|SM15T47AY/CAY|0.2|1|40.2|44.7|47|49.4|1|64.5|23.2|0.653|84|119|0.291|10.1|
|SM15T56AY/CAY|0.2|1|48|53.3|56|58.9|1|77.4|20|0.925|100|100|0.411|10.3|
|SM15T68AY/CAY|0.2|1|58.1|64.6|68|71.4|1|92|16.3|1.26|121|83|0.6|10.4|
|SM15T75AY/CAY|0.2|1|64.1|71.3|75|78.8|1|103|14.6|1.66|134|75|0.74|10.5|
|SM15T82AY/CAY|0.2|1|70|77.8|82|86.0|1|113|13.9|1.94|146|69|0.87|10.5|
1. Pulse test: t < 50 ms p
2. To calculate maximum clamping voltage at other surge level, use the following formula: VCLmax = VCL - RD x (IPP - IPPappli) where IPPappli is the surge current in the application
3. To calculate VBR or VCL versus junction temperature, use the following formulas: VBR @ TJ = VBR @ 25 °C x (1 + αT x (TJ - 25)) VCL @ TJ = VCL @ 25 °C x (1 + αT x (TJ - 25))
4. Surge capability given for both directions for unidirectional and bidirectional types.
3/12
Doc ID 17865 Rev 3
**Characteristics**
**SM15TY**
**==> picture [462 x 182] intentionally omitted <==**
**----- Start of picture text -----**
Figure 3. Peak pulse power dissipation Figure 4. Peak pulse power versus
versus initial junction temperature exponential pulse duration
(typical values) (Tj initial = 25 °C)
2000 PPP(W) 100.0 PPP(kW)
10/1000 µs
1500
10.0
1000
1.0
500
0 T (°C)j 0.1 tp (ms)
0 25 50 75 100 125 150 175 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01
**----- End of picture text -----**
**Figure 5. Clamping voltage versus peak pulse current (exponential waveform, maximum values)**
**Figure 6. Junction capacitance versus reverse applied voltage for unidirectional types (typical values)**
**==> picture [462 x 372] intentionally omitted <==**
**----- Start of picture text -----**
1000.0 IPP(A) 10000 C(pF)
Tj initial = 25 °C F = 1 MHz
VOSC = 30 mVRMS
100.0 SM15T6V8AY Tj = 25 °C
8/20 µs
10/1000 µs
10.0 1000
SM15T30AY
1.0
SM15T82AY
0.1 VCL(V) 100 VR(V)
1 10 100 1000 1 10 100 1000
Figure 7. Junction capacitance versus Figure 8. Thermal resistance junction to
reverse applied voltage for ambient versus copper surface
bidirectional types (typical values) under each lead
10000 C(pF) 100 Rth(j-a)(°C/W)
F = 1 MHz
SM15T6V8CAY VOSC = 30 mVRMS 90 Printed circuit board FR4,
Tj = 25 °C 80 copper thickness = 35 µm
70
60
SM15T30CAY
1000 50
40
30
SM15T82CAY
20
10
100 VR(V) 0 SCu(cm²)
1 10 100 1000 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
SM15T6V8AY/CAY SM15T30AY/CAY SM15T82AY/CAY
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4/12
Doc ID 17865 Rev 3
**SM15TY**
**Characteristics**
**Figure 9. Leakage current versus junction Figure 10. Peak forward voltage drop versus temperature (typical values) peak forward current (typical values)**
**==> picture [462 x 307] intentionally omitted <==**
**----- Start of picture text -----**
IR(nA) IFM(A)
1.E+04 100.0
VR = VRM
VRM < 10 V
1.E+03
10.0
1.E+02
Tj = 125 °C Tj = 25 °C
1.0
1.E+01 VRM [≥] 10 V
1.E+00 T (°C)j 0.1 VFM(V)
25 50 75 100 125 150 0.0 0.5 1.0 1.5 2.0 2.5
Figure 11. Relative variation of thermal impedance junction to ambient versus pulse duration
1.00 Zth(j-a)/Rth(j-a)
Recommended pad layout
printed circuit board,
copper thickness = 35 µm
0.10
Single pulse
0.01 tp(s)
1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
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5/12
Doc ID 17865 Rev 3
**Characteristics**
**SM15TY**
## **Figure 12. ISO7637-2 pulse 1 response (VS = -100 V)**
**==> picture [296 x 261] intentionally omitted <==**
**----- Start of picture text -----**
Voltage (V)
Voltage
10
0
-10
-20
-30
SM15T39AY
-40
SM15T39CAY
-50
-0.5 0.0 0.5 1.0 1.5 2.0 2.5
Time (ms)
5 Current (A)
Current
0
SM15T39AY
-5
SM15T39CAY
-10
-15
-0.5 0.0 0.5 1.0 1.5 2.0 2.5
Time (ms)
**----- End of picture text -----**
## **Figure 13. ISO7637-2 pulse 2 response (VS = 50 V)**
**==> picture [300 x 256] intentionally omitted <==**
**----- Start of picture text -----**
50 Voltage (V)
Voltage
40
SM15T39AY
30
SM15T39CAY
20
10
0
-20 0 20 40 60 80 100
Time (µs)
Current (A)
12
Current
8
SM15T39AY
4 SM15T39CAY
0
-4
-20 0 20 40 60 80 100
Time (µs)
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6/12
Doc ID 17865 Rev 3
**SM15TY**
**Characteristics**
## **Figure 14. ISO7637-2 pulse 3a response (VS = -150 V)**
**==> picture [292 x 254] intentionally omitted <==**
**----- Start of picture text -----**
Voltage (V)
20 Voltage
0.0 SM15T39AY
-20 SM15T39CAY
-40
-60
-0.5 0.0 0.5 1.0 1.5 2.0
Time (µs)
1 Current (A)
Current
0.0 SM15T39AY
SM15T39CAY
-1
-2
-0.2 0.8 1.8 0.0 0.0 0.0
Time (µs)
**----- End of picture text -----**
## **Figure 15. ISO7637-2 pulse 3b response (VS = 100 V)**
**==> picture [323 x 266] intentionally omitted <==**
**----- Start of picture text -----**
Voltage (V)
50
Voltage
40
SM15T39AY
30
SM15T39CAY
20
10
0
-0.2 0.8 1.8
Time (µs)
1.2 Current (A)
Current
0.8
SM15T39AY
0.4
SM15T39CAY
0
-0.4
-0.2 0.8 1.8
Time (µs)
**----- End of picture text -----**
_Note: ISO7637-2 pulses responses are not applicable for product with a stand off voltage lower than the average battery voltage (13.5 V)._
7/12
Doc ID 17865 Rev 3
**SM15TY**
**Application and design guidelines**
## **2 Application and design guidelines**
More information is available in the Application note AN2689 “Protection of automotive electronics from electrical hazards, guidelines for design and component selection”.
## **3 Ordering information scheme**
**==> picture [198 x 11] intentionally omitted <==**
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Figure 16. Ordering information scheme
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**==> picture [290 x 170] intentionally omitted <==**
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SM 15T XX CA Y
Surface mount
Surge rating
15 = 1500 W Transil in SMC
Breakdown voltage
Type s
CA = Bidirectional
A = Unidirectional
Automotive grade
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8/12
Doc ID 17865 Rev 3
**SM15TY**
**Package information**
## **4 Package information**
- Case: JEDEC DO-214AB molded plastic over planar junction
- Terminals: solder plated, solderable as per MIL-STD-750, Method 2026
- Polarity: for unidirectional types the band indicates cathode
- Flammability: epoxy is rated UL 94, V0
- RoHS package
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK[®] packages, depending on their level of environmental compliance. ECOPACK[®] specifications, grade definitions and product status are available at: www.st.com. ECOPACK[®] is an ST trademark.
|**Table 3.**|**Table 3.**|**Table 3.**|**SMC dimensions**|**SMC dimensions**|**SMC dimensions**||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|**C**||||||||**b**||**Ref.**|**Dimensions**||||
||||||||||||**Millimeters**||**Inches**||
||||||||||||**Min.**|**Max.**|**Min.**|**Max.**|
||||**E1**||**L**
**D**
**A1**
**A2**||||||||||
|||||||||||A1|1.90|2.45|0.075|0.096|
||||||||||||||||
|||||||||||A2|0.05|0.20|0.002|0.008|
|||||||||||b|2.90|3.20|0.114|0.126|
||||**E**||||||||||||
|||||||||||c|0.15|0.40|0.006|0.016|
|||||||||||D|5.55|6.25|0.218|0.246|
||||||||||||||||
|||||||||||E|7.75|8.15|0.305|0.321|
||||||||||||||||
||||**E2**||**L**|||**b**||E1|6.60|7.15|0.260|0.281|
|||||||||||E2|4.40|4.70|0.173|0.185|
|||||||||||L|0.75|1.50|0.030|0.059|
**Figure 17. SMC footprint dimensions in Figure 18. Marking layout[(1)] mm (inches)**
**==> picture [406 x 146] intentionally omitted <==**
**----- Start of picture text -----**
1.54 5.11 1.54
(0.061) (0.201) (0.061) Cathode bar (unidirectional devices only )
3.14 ECOPACK compliance
(0.124) XXX: Marking
x x x Z:Y: ManufacturingYear location
WW: week
z y w w
8.19
(0.322)
**----- End of picture text -----**
1. Marking layout can vary according to assembly location.
9/12
Doc ID 17865 Rev 3
**SM15TY**
**Package information**
**Table 4.**
**Marking**
|**Table 4.**
**Marking**||||
|---|---|---|---|
|**Order code**|**Marking**|**Order code**|**Marking**|
|SM15T6V8AY|MDEY|SM15T6V8CAY|BDEY|
|SM15T7V5AY|MDGY|SM15T7V5CAY|BDGY|
|SM15T10AY|MDPY|SM15T10CAY|BDPY|
|SM15T12AY|MDTY|SM15T12CAY|BDTY|
|SM15T15AY|MDXY|SM15T15CAY|BDXY|
|SM15T18AY|MEEY|SM15T18CAY|BEEY|
|SM15T22AY|MEKY|SM15T22CAY|BEKY|
|SM15T24AY|MEMY|SM15T24CAY|BEMY|
|SM15T27AY|MEPY|SM15T27CAY|BEPY|
|SM15T30AY|MERY|SM15T30CAY|BERY|
|SM15T33AY|METY|SM15T33CAY|BETY|
|SM15T36AY|MEVY|SM15T36CAY|BEVY|
|SM15T39AY|MEXY|SM15T39CAY|BEXY|
|SM15T47AY|MFAY|SM15T47CAY|BFAY|
|SM15T56AY|MFBY|SM15T56CAY|BFBY|
|SM15T68AY|MFPY|SM15T68CAY|BFPY|
|SM15T75AY|MFOY|SM15T75CAY|BFOY|
|SM15T82AY|MFRY|SM15T82CAY|BFRY|
10/12
Doc ID 17865 Rev 3
**SM15TY**
**Ordering information**
## **5 Ordering information**
## **Table 5. Ordering information**
|**Order code**|**Marking**|**Package**|**Weight**|**Base qty**|**Delivery mode**|
|---|---|---|---|---|---|
|SM15TxxxAY/CAY(1)|See_Table 4 on page 10_|SMC|0.25 g|2500|Tape and reel|
1. Where xxx is nominal value of VBR and A or CA indicates unidirectional or bidirectional version. See _Table 2_ for list of available devices and their order codes
## **6 Revision history**
**Table 6. Document revision history**
|**Date**|**Revision**|**Changes**|
|---|---|---|
|15-Sep-2010|1|Initial release.|
|09-Nov-2011|2|Added order codes in_Table 2_and_Table 4_.
Updated_Figure 5_,_6_,_7_, and_Table 1._Added_Figure 11_.
Deleted old Table 2. Thermal parameter. Updated_ISO_
_10605, C = 150 pF - R = 330_Ω_: on page 1_|
|27-Mar-2012|3|Added footnote on page 1.|
11/12
Doc ID 17865 Rev 3
**SM15TY**
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12/12
Doc ID 17865 Rev 3
## Links
- [View this product on Novapart](https://novapart.co/products/SM15T33CAY/tvs-diode-sm15t-bidirectional-282-v-59-do-214ab)
- [Request a quote for this part](https://novapart.co/quote/)
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---
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