0438002.WRGT

Surface Mount Fuses **Datasheet** 

**438GT Series** 0603 Fast-Acting Fuse 

## [_1@ **RoHS Pb** HF Aku G, 

## **Description** 

The 438GT Series is a 100% Lead-free, RoHS compliant and Halogen-free fuse series designed specifically to provide overcurrent protection to circuits that operate under high working ambient temperature up to 150ºC. 

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** 

## **Additional Information** 

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

- ■ 100% Lead-free, soldering RoHS compliant and Halogen■ Recognized to UL/CSA/NMX free 248-1 and UL/CSA/NMX 24814 

## **Applications** 

- Handheld Electronics ■ Hard Disk Drives 

- LCD Displays ■ SD Memory Cards 

- Battery Packs 

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## **Agency Approvals** 

|**Agency**<br>cWAd us|**Agency File Number**<br>E10480|**Ampere Range**<br>2A – 6A|
|---|---|---|
|G,|29862|2A – 6A|



## **Electrical Characteristics for Series** 

|**% of Ampere**<br>**Rating**<br>100%|**Ampere Rating**<br>2A – 6A|**Opening Time at 25ºC**<br>4 Hours,Minimum|
|---|---|---|
|250%|2A – 6A|5 Seconds,Maximum|



## **Electrical Specifications by Item** 

|**Ampere**<br>**Rating**<br>**(A)**<br>2|**Amp**<br>**Code**<br>002.|**Max.**<br>**Voltage**<br>**Rating (V)**<br>32|**Interrupting Rating**<br>**(AC/DC)1**<br>50A @ 32VDC/12VAC|**Nominal**<br>**Resistance**<br>**(Ohms)2**<br>0.0490|**Nominal**<br>**Melting I2t **<br>**(A2Sec.)3**<br>0.181|**Nominal Voltage**<br>**Drop At Rated**<br>**Current (V)4**<br>0.110|**Nominal Power**<br>**Dissipation At Rated**<br>**Current (W)**<br>0.220|**Agency Approvals**|**Agency Approvals**|
|---|---|---|---|---|---|---|---|---|---|
|||||||||x|x|
|2.5|02.5|32||0.0364|0.240|0.094|0.235|x|x|
|3|003.|32||0.0264|0.439|0.082|0.246|x|x|
|3.5|03.5|32||0.0210|0.647|0.078|0.273|x|x|
|4|004.|32||0.0164|0.739|0.075|0.300|x|x|
|5|005.|32||0.0127|0.747|0.072|0.360|x|x|
|6|006.|24|50A @ 24VDC/12VAC|0.0086|1.444|0.070|0.420|x|x|



## **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 1msec. opening time. 

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

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 02/22/21 

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Surface Mount Fuses **Datasheet** 

**438GT Series** 0603 Fast-Acting Fuse 

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## **Temperature Re-rating Curve** 

## **Average Time Current Curves** 

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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>


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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>2A 2.5A 3A 3.5A 4A 5A 6A<br>TIME IN SECONDS<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 

## **Soldering Parameters** 

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


© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 02/22/21 

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Surface Mount Fuses **Datasheet** 

**438GT Series** 0603 Fast-Acting Fuse 

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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 Sensitivity Level**|IPC/JEDEC J-STD-020, Level 1|
|**Solderability**|IPC/EIC/JEDEC J-STD-002, Condition B|
|**Humidity**|MIL-STD-202, Method 103, Conditions D|
|**Resistance to Solder Heat**|MIL-STD-202, Method 210, Condition B|



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Dimensions<br>1.582 ± 0.152<br>[0.062 ± 0.006]<br>0.83 ± 0.152<br>[0.033±0.006]<br>0.508±0.102<br>[0.020±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>


**Moisture Resistance** MIL-STD-202, Method 106 **Thermal Shock** MIL-STD-202, Method 107, Condition B-3 **Mechanical Shock** MIL-STD-202, Method 213, Condition A **Vibration** MIL-STD-202, Method 201 **Vibration, High Frequency** MIL-STD-202, Method 204, Condition D **Dissolution of Metallization** IPC/EIC/JEDEC J-STD-002, Condition D **Terminal Strength** IEC 60127-4 

## **Part Marking System** 

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Amp Code Marking Code<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** 

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0438     005.   W    R    GT<br>SERIES<br>PACKING CODE<br>R = Reel Pack<br>AMP CODE<br>QUANTITY CODE<br>W = 3000 pcs<br>**----- End of picture text -----**<br>


## **Packaging** 

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Quantity &<br>Packaging Option Packaging Specification Quantity<br> Packaging Code<br>8mm Tape and Reel EIA-481, IEC 60286, Part 3  3000 WR<br>**----- End of picture text -----**<br>


**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. 

© 2021 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 02/22/21 

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