04381.25WRA

Ceramic Fuse > 438A Series 

## **Surface Mount Fuses** 

## 438A Series – 0603 Fast-Acting Fuse 

## **RoHS** ~~**Pb** [_IQHF cSAMus @.~~ 

## ~~**Description**~~ 

The 438A series AECQ-compliant fuses are specifically tested to cater secondary circuit protection needs of compact auto electronics application. 

The general design ensures excellent temperature stability and performance reliability. 

The high I²t values which is typical in the Littelfuse ceramic fuse family ensure high inrush current withstand capability. 

## ~~**Features**~~ 

## ~~**Agency Approvals**~~ 

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|---|---|---|
|AGENCY|AGENCY FILE NUMBER|AMPERE RANGE|
|E10480|0.250A – 6A|
|cWkus|
|29862|0.250A – 6A|

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- Operating Temperature • Suitable for both leaded from -55ºC to +150ºC and lead-free reflow/wave soldering 

- 100% Lead-free, RoHS compliant and Halogen• Meets Littelfuse's free Automotive qualifications* 

- Largely based on Littelfuse internal AECQ-200 test plan. 

## ~~**Applications**~~ 

- Li-ion Battery • TFT  Display 

## ~~**Electrical Characteristics for Series**~~ 

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|---|---|---|
|% of Ampere|
|Ampere Rating|Opening Time at 25ºC|
|Rating|
|100%|0.250A – 6A|4 Hours, Minimum|
|250%|0.250A – 6A|5 Seconds, Maximum|

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- LED Head-Lights 

   - Battery Management System  (BMS) 

- Automotive Navigation System • Clusters 

## **Additional Information** 

**Datasheet Resources Samples** 

## ~~**Electrical Specifcations by Item**~~ 

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Agency Approvals<br>Ampere  Max.  Nominal   Nominal  Nominal Voltage  Nominal Power<br>Rating Amp  Voltage  Interrupting Rating Resistance  Melting I [2] t  Drop At Rated  Dissipation At  PF<br>Code (AC/DC) [1]<br>(A) Rating (V) (Ohms) [2] (A [2] Sec.) [3] Current (V) [4] Rated Current (W)<br>0.25 .250 63VDC 2.218 0.0017 0.550 0.138 x x<br>0.375 | .375 | 63VDC a 1.247 0.0041 0.488 0.183 x x<br>0.5 a .500 63VDC ee 50A @ 63VDC a 0.829 ee 0.0100 0.486 0.243 x x<br>0.75 a .750 63VDC 50A @ 32VAC a 0.466 0.0281 es 0.378 0.284 x x<br>1 a 001. 63VDC a 0.310 0.0593 ee 0.351 0.351 x x<br>1.25 a 1.25 63VDC 0.200 0.0510 0.365 0.456 x x<br>a a es<br>1.75 a 1.75 QC 32VDC 50A@32VAC/32VDC 1.405 0.1440 0.360 0.540 x x<br>2 002. 32 0.0490 0.181 0.107 0.214 x x<br>| et a ee<br>2.5 02.5 32 0.0364 0.240 0.095 0.238 x x<br>| | es<br>3 003. 32 0.0264 0.439 0.093 0.279 x x<br>| | 50A @ 32VDC/12VAC a ee<br>3.5 | 03.5 ot 32 ee 0.0210 0.647 0.082 0.287 x x<br>4 004. 32 0.0177 0.730 0.079 0.316 x x<br>5 005. 32 a 0.0127 0.747 0.074 0.370 x x<br>| [tT] a<br>6 a 006. a 24 50A @ 24VDC a /12VAC 0.0086 ee 1.444 Ce 0.072 0.432 x x<br>**----- End of picture text -----**<br>


Notes: 

1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting Rating tested at rated voltage with time constant < 0.8 msec. 

2. Nominal Resistance measured with < 10% rated current. 

3. Nominal Melting I²t measured at 1 msec. opening time. 

Devices designed to carry rated current for 4 hours minimum. It is recommended that devices be operated continuously at no more than 80% rated current. See “Temperature Re-rating Curve”for additional re-rating information. 

Devices designed to be mounted with marking code facing up. 

4. Nominal Voltage Drop measured at rated current after temperature has stabilized. 

© 2017 Littelfuse, Inc. 

Specifications are subject to change without notice.  Application testing is strongly recommendedSpecifications are subject to change without notice **.** Revised: 12/06/17 

**Surface Mount Fuses** Ceramic Fuse > 438A Series 

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Temperature Re-rating Curve<br>**----- End of picture text -----**<br>


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140<br>120<br>100<br>80<br>60<br>40<br>-65     -45      -25       -5        15       35       55       75       95      115     135    155<br>TEMPERATURE (°C)<br>PERCENT OF RATING<br>**----- End of picture text -----**<br>


Note: 

1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for continuous operation. 

Example: 

- For continuous operation at 75 degrees celsius, the fuse should be rerated as follows: 

- I = (0.80)(0.85)IRAT = (0.68)IRAT 

## ~~**Average Time Current Curves**~~ 

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100<br>10<br>1<br>0.1<br>0.01<br>0.001<br>0.1 1 10 100<br>CURRENT IN AMPERES<br>.250A .375A .500A .750A 1A 1.25A  1.75A 2A 2.5A 3A 3.5A 4A 5A 6A<br>TIME IN SECONDS<br>**----- End of picture text -----**<br>


## ~~**Soldering Parameters**~~ 

|Refow Condition<br>Pre Heat<br>- Temperature Min (Ts(min))<br>- Temperature Max (Ts(max))<br>- Time (Min to Max) (ts)<br>Average Ramp-up Rate (Liquidus Temp<br>(TL) to peak)|Pb – free assembly<br>150°C<br>200°C<br>60 – 180 seconds<br>3°C/second max.|
|---|---|
|TS(max)to TL- Ramp-up Rate|5°C/second max.|
|Refow<br>- Temperature (TL) (Liquidus)<br>- Temperature (tL)|217°C<br>60 – 150 seconds|
|Peak Temperature (TP)|260+0/-5°C|
|Time within 5°C of actual peak<br>Temperature (tp)|10 – 30 seconds|
|Ramp-down Rate|6°C/second max.|
|Time 25°C to peak Temperature (TP)|8 minutes max.|
|Do not exceed|260°C|
|||
|Wave Soldering<br>260°C, 10 seconds max.||



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t P<br>T P<br>Critical Zone<br>Ramp-up TL to TP<br>T S(max) T L t L<br>Ramp-down<br>Preheat<br>T S(min)<br>t S<br>25<br>time to peak temperature Time<br>(t 25ºC to peak)<br>Temperature<br>**----- End of picture text -----**<br>


© 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/06/17 

**Surface Mount Fuses** Ceramic Fuse > 438A Series 

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## ~~**Product Characteristics**~~ 

|**Materials**|**Body:**Advanced Ceramic<br>**Terminations:**Ag/Ni/Sn (100% Lead-free)<br>**Element Cover Coating: **Lead-free Glass|
|---|---|
|**Moisture**<br>**Sensitivity Level**<br>**Solderability**|IPC/JEDEC J-STD-020, Level 1<br>IPC/EIC/JEDEC J-STD-002, Condition C|
|**Humidity Test**|MIL-STD-202, Method 103, Conditions D|
|**Resistance to**<br>**Solder Heat**|MIL-STD-202, Method 210, Condition B|
|**Moisture**<br>**Resistance**|MIL-STD-202, Method 106|
|**Thermal Shock**|MIL-STD-202, Method 107,<br>Condition B|
|**Mechanical**<br>**Shock**|MIL-STD-202, Method 213,<br>Condition A|
|**Vibration**|MIL-STD-202, Method 201|
|**Vibration,**<br>**High Frequency**|MIL-STD-202, Method 204,<br>Condition D|
|**Dissolution of**<br>**Metallization**|IPC/EIC/JEDEC J-STD-002,<br>Condition D|
|**Terminal**<br>**Strength**|IEC 60127-4|



## ~~**Dimensions**~~ 

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1.575±0.152<br>[0.062 ± 0.006]<br>0.85 ± 0.150<br>[0.033 ± 0.006]<br>0.530 +/- 0.150<br>[0.021 +/- 0.006]<br>0.508±0.102<br>[0.02±0.004]<br>0.432 +/- 0.150<br>[0.017 +/- 0.006]<br>0.60 0.74<br>[0.024] [0.029]<br>1.00<br>[0.039]<br>1.94<br>[0.076]<br>**----- End of picture text -----**<br>


|**High Temperature**<br>**Storage**|<br>MIL-STD-202 Method 108 with exemptions|
|---|---|
|**Thermal Shock**<br>**Test**|JESD22 Method JA-104,<br>Test Conditions B and N|
|**Biased Humidity**|MIL-STD-202 Method 103, 85°C/85% RH<br>with 10% operating power for 1000 hrs|
|**Operational Life**|MIL-STD-202 Method 108, Test Condition D|
|**Resistance To**<br>**Solvents**|MIL-STD-202 Method 215|
|**Mechanical**<br>**Shock**|MIL-STD-202 Method 213, Test Condition C|
|**High Frequency**<br>**Vibration**|MIL-STD-202, Method 204|
|**Resistance To**<br>**Soldering Heat**|MIL-STD-202 Method 210, Test Condition B|
|**Solderability**|JESD22-B102E Method 1|
|**Terminal**<br>**Strength For**<br>**SMD**|AEC Q200-006|
|**Board Flex**|AEC Q200-005|
|**Electrical**<br>**Characterization**|3 Temperature Electrical Characterization|



## ~~**Part Marking System**~~ 

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Amp Code Marking Code<br>.250 D<br>.375 E<br>.500 F<br>.750 G<br>001. H<br>1.25 J<br>1.75 L<br>002. N<br>02.5 O<br>003. P<br>03.5 R<br>004. S<br>005. T<br>006. U<br>**----- End of picture text -----**<br>


## ~~**Part Numbering System**~~ 

**0438 005. W   R A** 

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SERIES AEC-Q200 QUALIFIED<br>PACKING CODE<br>AMP CODE R = Reel Pack<br>QUANTITY CODE<br>W = 3000 pcs<br>**----- End of picture text -----**<br>


© 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/06/17 

**Surface Mount Fuses** Ceramic Fuse > 438A Series 

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||~~**Packaging**~~|||||
|---|---|---|---|---|---|
||Packaging Option|Packaging Specifcation|Quantity|Quantity & Packaging Code||
||8mm Tape and Reel|EIA-481, IEC 60286, Part 3|3000|WR||



**Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.** 

© 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/06/17