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Surface Mount Fuses  
Ceramic Fuse > 438A Series  
RoHS Pb  
438A Series – 0603 Fast-Acting Fuse  
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  
• OperatingTemperature  
from -55ºC to +150ºC  
• Meets Littelfuse's  
Automotive qualifications*  
• 100% Lead-free, RoHS  
compliant and Halogen-  
free  
• Recognized to UL/CSA/  
NMX 248-1 and UL/CSA/  
NMX 248-14  
Agency Approvals  
Agency  
Agency File Number  
E10480  
Ampere Range  
0.25A – 6A  
• Suitable for both leaded  
and lead-free reflow/wave  
soldering  
29862  
0.25A – 6A  
* Largely based on Littelfuse internal AECQ-200 test plan.  
Applications  
• Li-ion Battery  
• TFT Display  
Electrical Characteristics for Series  
• LED Head-Lights  
• Battery Management  
System (BMS)  
% of Ampere  
Ampere Rating  
Rating  
• Automotive Navigation  
System  
OpeningTime at 25ºC  
• Clusters  
100%  
250%  
0.250A – 6A  
0.250A – 6A  
4 Hours, Minimum  
Additional Information  
5 Seconds, Maximum  
Datasheet  
Resources  
Samples  
Electrical Specifications by Item  
Agency Approvals  
Ampere  
Rating  
(A)  
Max.  
Voltage  
Rating (V)  
Nominal  
Nominal  
Melting I2t  
(A2Sec.)3  
NominalVoltage  
Nominal Power  
Dissipation At Rated  
Current (W)  
Amp  
Code  
Interrupting Rating  
Resistance  
Drop At Rated  
(AC/DC)1  
(Ohms)2  
Current (V)4  
0.25  
0.375  
0.5  
0.75  
1
.250  
.375  
.500  
.750  
001.  
1.25  
1.75  
002.  
02.5  
003.  
03.5  
004.  
005.  
006.  
63VDC  
63VDC  
63VDC  
63VDC  
63VDC  
63VDC  
32VDC  
32  
2.218  
1.247  
0.0017  
0.0041  
0.0100  
0.0281  
0.0593  
0.0510  
0.1440  
0.181  
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  
0.072  
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
0.829  
50A @ 63VDC  
50A @ 32VAC  
0.466  
0.310  
1.25  
1.75  
2
0.200  
50A@32VAC/32VDC  
50A @ 32VDC/12VAC  
50A @ 24VDC/12VAC  
0.1405  
0.0490  
0.0364  
0.0264  
0.0210  
0.0177  
0.0127  
0.0086  
2.5  
3
32  
0.240  
0.439  
0.647  
0.730  
0.747  
32  
3.5  
4
32  
32  
5
32  
6
24  
1.444  
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.  
© 2019 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Revised: 10/11/19  
Surface Mount Fuses  
Ceramic Fuse > 438A Series  
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)IRAT = (0.68)IRAT  
0.01  
0.001  
0.1  
1
10  
100  
CURRENT IN AMPERES  
Soldering Parameters  
Reflow Condition  
-Temperature Min (Ts(min)  
-Temperature Max (Ts(max)  
-Time (Min to Max) (ts)  
Pb – free assembly  
150°C  
tP  
)
TP  
TL  
Critical Zone  
Pre Heat  
)
200°C  
Ramp-up  
T
L to TP  
60 – 180 seconds  
tL  
Average Ramp-up Rate (LiquidusTemp (TL) to peak) 3°C/second max.  
TS(max)  
T
S(max) toTL - Ramp-up Rate  
5°C/second max.  
217°C  
Ramp-down  
-Temperature (TL) (Liquidus)  
-Temperature (tL)  
Preheat  
Reflow  
TS(min)  
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.  
© 2019 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Revised: 10/11/19  
Surface Mount Fuses  
Ceramic Fuse > 438A Series  
Product Characteristics  
Body: Advanced Ceramic  
Terminations: Ag/Ni/Sn (100% Lead-free)  
Element Cover Coating: Lead-free Glass  
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  
IPC/JEDEC J-STD-020, Level 1  
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  
MIL-STD-202, Method 204, Condition D  
Terminal Strength For SMD AEC Q200-006  
Dissolution of Metallization IPC/EIC/JEDEC J-STD-002, Condition D  
Board Flex  
AEC Q200-005  
Terminal Strength  
IEC 60127-4  
Electrical Characterization  
3Temperature Electrical Characterization  
Dimensions  
Part Marking System  
1.575±±.15ꢀ2  
[±.±6ꢀ2±2±.±±6ꢁ  
Amp Code  
Marking Code  
.250  
.375  
.500  
.750  
001.  
1.25  
1.75  
002.  
02.5  
003.  
03.5  
004.  
005.  
006.  
D
E
±.852±2±.15±2  
[±.±332±2±.±±6ꢁ  
F
G
H
J
±.53±2+/-2±.15±2  
[±.±ꢀ12+/-2±.±±6ꢁ  
L
N
O
P
±.5±8±±.1±ꢀ  
[±.±ꢀ±±.±±4ꢁ  
R
S
T
U
Part Numbering System  
±.43ꢀ2+/-2±.15±  
[±.±172+/-2±.±±6ꢁ  
0438 005. W R  
A
±.6±  
[±.±ꢀ4ꢁ  
±.74  
[±.±ꢀ9ꢁ  
AEC-Q200 Qualified  
Series  
Packing Code  
R = Reel Pack  
Amp Code  
1.±±  
[±.±39ꢁ  
Quantity Code  
1.94  
[±.±76ꢁ  
Packaging  
Packaging Option  
Packaging Specification  
Quantity  
Quantity & Packaging Code  
8mmTape 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.  
© 2019 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Revised: 10/11/19