438 Datasheet, PDF (1/4 Pages) Littelfuse – Surface Mount Fuses

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.
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E10480
LR29862
AMPERE RANGE
0.250A – 6A
0.250A – 6A
Electrical Characteristics for Series
% of Ampere
Rating
100%
250%
Ampere Rating
0.250A – 6A
0.250A – 6A
Opening Time at 25ºC
4 Hours, Minimum
5 Seconds, Maximum
Features
t
0QFSBUJOH
5FNQFSBUVSF

from -55ºC to +150ºC
t

-FBEGSFF
3P)4

compliant and Halogen-
free
t
4VJUBCMF
GPS
CPUI
MFBEFE

and lead-free reflow /
wave soldering
Applications
t
)BOEIFME
&MFDUSPOJDT
t
-$%
%JTQMBZT
t
#BUUFSZ
1BDLT
t
)BSE
%JTL
%SJWFT
t
4%
.FNPSZ
$BSET
t
"VUPNPUJWF
&MFDUSPOJDT
Electrical Specifications by Item
Ampere
Rating
(A)
Amp
Code
Max.
Voltage
Rating (V)
Interrupting Rating
Nominal Nominal Nominal Voltage Nominal Power ^{Agency Approvals}
Resistance Melting I²t Drop At Rated Dissipation At
(Ohms)² (A²Sec.)³
Current (V)⁴ Rated Current (W)
0.25 .250
32
0.375 .375
32
0.5 .500
32
0.75 .750
32
1
001.
32
1.25 1.25
32
1.5 01.5
32
1.75 1.75
32
2
002.
32
2.5 02.5
32
3
003.
32
3.5 03.5
32
4
004.
32
5
005.
32
6
006.
24
50 A @ 32 VDC
50 A @ 24 VDC
2.024
1.247
0.829
0.466
0.310
0.200
0.174
0.125
0.051
0.0324
0.0252
0.0203
0.0169
0.0113
0.0087
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
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 1 msec. 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
Rerating Curve”for additional rerating information.
Devices designed to be mounted with marking code facing up.
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/438.html for current information.
21
Revised: August 21, 2009
438 Series