Surface Mount Fuses
Ceramic Fuse > 438 Series
438 Series – 0603 Fast-Acting Fuse
Description
The 438 Series is a 100% Lead-free, RoHS compliant and
Halogen-free fuse series designed specifically to provide
over-current 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
Agency Approvals
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AGENCY
AGENCY FILE NUMBER
AMPERE RANGE
0.250A – 6A
from -55ºC to +150ºC
and lead-free reflow /
wave soldering
E10480
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compliant and Halogen-
free
LR29862
0.250A – 6A
Applications
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Electrical Characteristics for Series
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% of Ampere
Ampere Rating
OpeningTime at 25ºC
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Rating
100%
250%
0.250A – 6A
0.250A – 6A
4 Hours, Minimum
5 Seconds, Maximum
Electrical Specifications by Item
Agency Approvals
Ampere
Rating
(A)
Max.
Voltage
Rating (V)
Nominal
Nominal Nominal Voltage Nominal Power
Amp
Code
Interrupting Rating
Resistance Melting I2t
Drop At Rated
Dissipation At
(Ohms)2
(A2Sec.)3
Current (V)4
Rated Current (W)
0.25
0.375
0.5
0.75
1
1.25
1.5
1.75
2
2.5
3
3.5
4
.250
.375
.500
.750
001.
1.25
01.5
1.75
002.
02.5
003.
03.5
004.
005.
006.
32
32
32
32
32
32
32
32
32
32
32
32
32
32
24
2.024
1.247
0.829
0.466
0.310
0.0017
0.0041
0.0100
0.0281
0.0593
0.0510
0.0902
0.1440
0.1490
0.1977
0.2922
0.4752
0.6920
0.7398
1.3838
0.550
0.488
0.486
0.378
0.351
0.365
0.368
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
0.552
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
0.200
0.174
50 A @ 32 VDC
0.125
0.051
0.0324
0.0252
0.0203
0.0169
0.0113
0.0087
5
6
50 A @ 24 VDC
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
Rerating Curve”for additional rerating 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.
© 2009 Littelfuse, Inc.
438 Series
21
Revised: August 21, 2009
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/438.html for current information.
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