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Surface Mount Fuses Datasheet  
438A Series  
AEC-Q200 Qualified > Ceramic Fuse  
RoHS Pb  
Description  
The 438A series AEC-Q200 Qualified 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 & Benefits  
■ OperatingTemperature from  
■ Conforms to EN 60127-1 and  
-55ºC to +150ºC  
EN 60127-7  
■ 100% Lead-free, RoHS  
compliant and Halogen-free  
■ CE Mark indicates suitability  
for the European Market  
■ Suitable for both leaded and  
■ UKCA Mark indicates suitability  
lead-free reflow/wave soldering for the UK Market  
Additional Information  
■ Recognized to UL/CSA/NMX  
248-1 and UL/CSA/NMX 248-  
14  
■ AEC-Q200 Qualified  
Applications  
■ Li-ion Battery  
Resources  
Accessories  
Samples  
■ TFT Display  
■ LED Head-Lights  
■ Battery Management System  
(BMS)  
Agency Approvals  
■ Automotive Navigation  
System  
■ Clusters  
Agency  
Agency File Number  
Ampere Range  
E10480  
29862  
J50489122  
N/A  
0.25A – 6A  
0.25A – 6A  
0.25A – 6A  
0.25A – 6A  
0.25A – 6A  
Electrical Characteristics for Series  
% of Ampere Rating Ampere Rating  
OpeningTime at 25ºC  
100%  
250%  
0.250A – 6A  
0.250A – 6A  
4 Hours, Minimum  
N/A  
5 Seconds, Maximum  
Electrical Specifications by Item  
Ampere  
Rating  
(A)  
Max.  
Voltage  
Rating (V)  
Nominal  
Nominal NominalVoltage Nominal Power  
Agency Approvals  
Amp  
Code  
Interrupting Rating  
(AC/DC)1  
Resistance Melting I2t Drop At Rated  
Dissipation At  
Rated Current (W)  
(Ohms)2  
2.218  
1.247  
0.829  
0.466  
0.310  
0.200  
(A2Sec.)3  
0.0017  
0.0041  
0.0100  
0.0281  
0.0593  
0.0510  
0.1440  
0.181  
0.240  
0.439  
0.647  
0.730  
Current (V)4  
0.550  
0.488  
0.486  
0.378  
0.351  
0.365  
0.360  
0.107  
0.095  
0.093  
0.082  
0.079  
0.074  
0.25 .250 63VDC  
0.375 .375 63VDC  
0.5  
0.138  
0.183  
0.243  
0.284  
0.351  
0.456  
0.540  
0.214  
0.238  
0.279  
0.287  
0.316  
0.370  
0.432  
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
.500 63VDC  
50A @ 63VDC  
50A @ 32VAC  
0.75 .750 63VDC  
1
1.25  
1.75  
2
2.5  
3
3.5  
4
5
001. 63VDC  
1.25 63VDC  
1.75 32VDC 50A@32VAC/32VDC 0.1405  
002.  
02.5  
003.  
03.5  
004.  
005.  
006.  
32  
32  
32  
32  
32  
32  
24  
0.0490  
0.0364  
0.0264  
0.0210  
0.0177  
0.0127  
50A @ 32VDC/12VAC  
0.747  
6
50A @ 24VDC/12VAC 0.0086  
1.444  
0.072  
Notes:  
4. Nominal Voltage Drop measured at rated current after temperature has stabilized.  
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.  
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.  
3. Nominal Melting I²t measured at 1 msec. opening time.  
Devices designed to be mounted with marking code facing up.  
© 2023 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Revised: GD. 07/18/23  
6
Surface Mount Fuses Datasheet  
438A Series  
AEC-Q200 Qualified > Ceramic Fuse  
Temperature Re-rating Curve  
AverageTime Current Curves  
140  
120  
100  
80  
100  
10  
60  
1
40  
-65 -45  
-25  
-5  
15  
35  
55  
75  
95  
115 135 155  
TEMPERATURE (°C)  
0.1  
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)In = (0.68)In  
0.01  
0.001  
0.1  
1
10  
100  
CURRENT IN AMPERES  
Soldering Parameters  
Pb – free  
assembly  
Reflow Condition  
tP  
-Temperature Min (Ts(min)  
-Temperature Max (Ts(max)  
-Time (Min to Max) (ts)  
)
150°C  
TP  
TL  
Critical Zone  
Ramp-up  
T
L to TP  
Pre Heat  
)
200°C  
60 – 180 seconds  
3°C/second max.  
5°C/second max.  
217°C  
tL  
Average Ramp-up Rate (LiquidusTemp (TL) to peak)  
TS(max) toTL - Ramp-up Rate  
TS(max)  
Ramp-down  
-Temperature (TL) (Liquidus)  
Preheat  
Reflow  
TS(min)  
-Temperature (tL)  
60 – 150 seconds  
260+0/-5 °C  
tS  
PeakTemperature (TP)  
Time within 5°C of actual peakTemperature (tp)  
Ramp-down Rate  
10 – 30 seconds  
6°C/second max.  
8 minutes max.  
260°C  
25  
time to peak temperature  
(t 25ºC to peak)  
Time  
Time 25°C to peakTemperature (TP)  
Do not exceed  
Wave Soldering  
260°C, 10 seconds max.  
© 2023 Littelfuse, Inc.  
Specifications are subject to change without notice.  
7
Revised: GD. 07/18/23  
Surface Mount Fuses Datasheet  
438A Series  
AEC-Q200 Qualified > Ceramic Fuse  
Product Characteristics  
Body: Advanced Ceramic  
Terminations: Ag/Ni/Sn (100% Lead-free)  
Element Cover Coating: Lead-free Glass  
IPC/JEDEC J-STD-020, Level 1  
High Temperature Storage MIL-STD-202 Method 108 with exemptions  
Materials  
JESD22 Method JA-104,  
Test Conditions B and N  
Thermal ShockTest  
Moisture Sensitivity Level  
Solderability  
MIL-STD-202 Method 103, 85°C/85% RH  
with 10% operating power for 1000 hrs  
Biased Humidity  
IPC/EIC/JEDEC J-STD-002, Condition C  
MIL-STD-202, Method 103, Conditions D  
MIL-STD-202, Method 210, Condition B  
MIL-STD-202, Method 106  
HumidityTest  
Operational Life  
MIL-STD-202 Method 108, Test Condition D  
MIL-STD-202 Method 215  
Resistance to Solder Heat  
Moisture Resistance  
ResistanceTo Solvents  
Mechanical Shock  
MIL-STD-202 Method 213, Test Condition C  
High FrequencyVibration  
MIL-STD-202, Method 204  
Thermal Shock  
MIL-STD-202, Method 107, Condition B  
MIL-STD-202, Method 213, Condition A  
MIL-STD-202, Method 201  
ResistanceTo Soldering  
Heat  
Mechanical Shock  
Vibration  
MIL-STD-202 Method 210, Test Condition B  
Solderability  
JESD22-B102E Method 1  
Vibration, High Frequency  
Dissolution of Metallization  
MIL-STD-202, Method 204, Condition D  
IPC/EIC/JEDEC J-STD-002, Condition D  
Terminal Strength For SMD AEC-Q200-006  
Board Flex  
AEC-Q200-005  
Conducted at minimum, ambient, and  
maximum temperatures  
Electrical Characterization  
Dimensions mm [in]  
Part Marking System  
1.582 +/- 0.152  
[0.062 +/- 0.006]  
Amp Code  
Marking Code  
.250  
.375  
.500  
.750  
001.  
1.25  
1.75  
002.  
02.5  
003.  
03.5  
004.  
005.  
006.  
D
E
F
G
H
J
0.828 +/- 0.152  
[0.033 +/- 0.006]  
0.530 +/- 0.150  
[0.021 +/- 0.006]  
L
N
O
P
R
S
T
(0.250A - 1.25A, 1.75A)  
0.5156 +/- 0.0635 [0.0203 +/- 0.0025]  
(1.5A, 2A - 6A)  
0.508 +/- 0.102 [0.02 +/- 0.004]  
U
Part Numbering System  
0.432 +/- 0.150  
[0.017 +/- 0.006]  
0438 005. W R  
A
0.60  
[0.024]  
0.74  
[0.029]  
AEC-Q200 Qualified  
Series  
Packing Code  
R = Reel Pack  
Amp Code  
1.00  
[0.039]  
Quantity Code  
1.94  
[0.076]  
Packaging  
Packaging Option  
Packaging Specification  
Quantity  
Quantity & Packaging Code  
8mmTape and Reel  
EIA-481, IEC 60286-3  
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.  
© 2023 Littelfuse, Inc.  
Specifications are subject to change without notice.  
8
Revised: GD. 07/18/23