转到网站首页
转为中文步骤：
1、请用电脑端360浏览器打开本页地址，如您电脑未安装360浏览器，请点这里下载;
2、点击360浏览器右上角的翻译插件，如右图红圈中所示:
3、点击所弹出窗口里的右下角的按钮 “翻译当前网页”;
4、弹窗提示翻译完毕后关闭弹窗即可；
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  
• Suitable for both leaded  
and lead-free reflow/wave  
soldering  
Agency Approvals  
• 100% Lead-free, RoHS  
compliant and Halogen-  
free  
• Meets Littelfuse's  
Automotive qualifications*  
AGENCY  
AGENCY FILE NUMBER  
E10480  
AMPERE RANGE  
0.250A – 6A  
* Largely based on Littelfuse internal AECQ-200 test plan.  
29862  
0.250A – 6A  
Applications  
• Li-ion Battery  
• TFT Display  
Electrical Characteristics for Series  
• LED Head-Lights  
• Battery Management  
System (BMS)  
% of Ampere  
• Automotive Navigation  
System  
Ampere Rating  
OpeningTime at 25ºC  
Rating  
100%  
250%  
• Clusters  
0.250A – 6A  
0.250A – 6A  
4 Hours, Minimum  
Additional Information  
5 Seconds, Maximum  
ꢀatasꢁeet  
ꢀesources  
Saꢀꢁꢂes  
Electrical Specifications by Item  
Agency Approvals  
Ampere  
Rating  
(A)  
Max.  
Nominal  
Nominal Nominal Voltage Nominal Power  
Amp  
Code  
Interrupting Rating  
Voltage  
Resistance Melting I2t  
Drop At Rated  
Dissipation At  
(AC/DC)1  
Rating (V)  
(Ohms)2  
(A2Sec.)3  
Current (V)4  
Rated Current (W)  
0.25  
0.375  
0.5  
0.75  
1
1.25  
1.75  
2
2.5  
3
.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  
32  
32  
32  
32  
32  
24  
2.218  
1.247  
0.829  
0.466  
0.310  
0.200  
1.405  
0.0490  
0.0364  
0.0264  
0.0210  
0.0177  
0.0127  
0.0086  
0.0017  
0.0041  
0.0100  
0.0281  
0.0593  
0.0510  
0.1440  
0.181  
0.240  
0.439  
0.647  
0.730  
0.747  
1.444  
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
50A @ 63VDC  
50A @ 32VAC  
50A@32VAC/32VDC  
50A @ 32VDC/12VAC  
50A @ 24VDC/12VAC  
3.5  
4
5
6
Notes:  
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.  
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 be mounted with marking code facing up.  
3. Nominal Melting I²t measured at 1 msec. opening time.  
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 recommended.  
Revised: 12/06/17  
Surface Mount Fuses  
Ceramic Fuse > 438A Series  
Temperature Re-rating Curve  
AverageTime Current Curves  
140  
120  
100  
80  
100  
10  
1
60  
40  
-65 -45  
-25  
-5  
15  
35  
55  
75  
95  
115 135 155  
ꢀꢁMꢂꢁꢃꢄꢀꢅꢃꢁ ꢆꢇꢈꢉ  
0.1  
Note:  
1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for  
continuous operation.  
0.01  
Example:  
For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:  
I = (0.80)(0.85)IRAT = (0.68)IRAT  
0.001  
0.1  
1
10  
100  
ꢄꢇꢈꢈꢂꢃꢀ ꢁꢃ ꢉMꢊꢂꢈꢂS  
Soldering Parameters  
tP  
Reflow Condition  
-Temperature Min (Ts(min)  
Pb – free assembly  
TP  
Critical Zone  
Ramp-up  
TL to TP  
)
150°C  
TL  
TS(max)  
Pre Heat -Temperature Max (Ts(max)  
)
200°C  
tL  
-Time (Min to Max) (ts)  
60 – 180 seconds  
Ramp-down  
Average Ramp-up Rate (LiquidusTemp  
(TL) to peak)  
Preheat  
3°C/second max.  
5°C/second max.  
TS(min)  
tS  
TS(max) toTL - Ramp-up Rate  
-Temperature (TL) (Liquidus) 217°C  
25  
Reflow  
time to peak temperature  
(t 25ºC to peak)  
-Temperature (tL)  
60 – 150 seconds  
260+0/-5 °C  
Time  
PeakTemperature (TP)  
Time within 5°C of actual peak  
Temperature (tp)  
10 – 30 seconds  
Ramp-down Rate  
6°C/second max.  
8 minutes max.  
260°C  
Time 25°C to peakTemperature (TP)  
Do not exceed  
Wave Soldering  
260°C, 10 seconds max.  
© 2017 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Revised: 12/06/17  
Surface Mount Fuses  
Ceramic Fuse > 438A Series  
Product Characteristics  
Body: Advanced Ceramic  
Terminations: Ag/Ni/Sn (100% Lead-free)  
High Temperature  
Storage  
MIL-STD-202 Method 108 with exemptions  
Materials  
Element Cover Coating: Lead-free Glass  
Thermal Shock  
Test  
JESD22 Method JA-104,  
Test Conditions B and N  
Moisture  
IPC/JEDEC J-STD-020, Level 1  
Sensitivity Level  
MIL-STD-202 Method 103, 85°C/85% RH  
with 10% operating power for 1000 hrs  
Biased Humidity  
Operational Life  
Solderability  
HumidityTest  
IPC/EIC/JEDEC J-STD-002, Condition C  
MIL-STD-202, Method 103, Conditions D  
MIL-STD-202 Method 108, Test Condition D  
MIL-STD-202 Method 215  
ResistanceTo  
Solvents  
Mechanical  
Shock  
High Frequency  
Vibration  
Resistance to  
Solder Heat  
Moisture  
MIL-STD-202, Method 210, Condition B  
MIL-STD-202, Method 106  
MIL-STD-202 Method 213, Test Condition C  
MIL-STD-202, Method 204  
Resistance  
MIL-STD-202, Method 107,  
Condition B  
Thermal Shock  
Mechanical  
Shock  
ResistanceTo  
Soldering Heat  
MIL-STD-202, Method 213,  
Condition A  
MIL-STD-202 Method 210, Test Condition B  
JESD22-B102E Method 1  
Vibration  
MIL-STD-202, Method 201  
Solderability  
Vibration,  
High Frequency  
Terminal  
Strength For  
SMD  
MIL-STD-202, Method 204,  
Condition D  
AEC Q200-006  
Dissolution of  
Metallization  
IPC/EIC/JEDEC J-STD-002,  
Condition D  
Board Flex  
AEC Q200-005  
Terminal  
Strength  
Electrical  
Characterization  
IEC 60127-4  
3Temperature Electrical Characterization  
Dimensions  
Part Marking System  
1.575±±.152  
[±.±62 ± ±.±±6]  
Amp Code Marking Code  
.250  
.375  
.500  
.750  
001.  
1.25  
1.75  
002.  
02.5  
003.  
03.5  
004.  
005.  
006.  
D
E
±.85 ± ±.15±  
[±.±33 ± ±.±±6]  
F
G
H
J
±.53± +/- ±.15±  
[±.±21 +/- ±.±±6]  
L
N
O
P
±.5±8±±.1±2  
[±.±2±±.±±4]  
R
S
T
U
±.432 +/- ±.15±  
[±.±17 +/- ±.±±6]  
Part Numbering System  
±.6±  
[±.±24]  
±.74  
[±.±29]  
0438 005. W R  
A
AEC-Q200 QUALIFIED  
SERIES  
1.±±  
[±.±39]  
PACKING CODE  
R = Reel Pack  
AMP CODE  
QUANTITY CODE  
W = 3000 pcs  
1.94  
[±.±76]  
© 2017 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Revised: 12/06/17  
Surface Mount Fuses  
Ceramic Fuse > 438A Series  
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.  
© 2017 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Revised: 12/06/17