© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Notes:
1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting
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.
Please refer to www.littelfuse.com/series/440.html for current information.
Ampere
% of Ampere
Agency Approvals
Electrical Characteristics for Series
Electrical Specifications by Item
Rating
Rating tested at rated voltage with time constant < 0.8 msec.
AGENCY
0.375
0.25
0.75
1.25
1.75
(A)
0.5
2.5
3.5
1.5
1
2
3
4
5
7
8
Rating
100%
350%
Code
Amp
.250
.375
.500
.750
002.
02.5
003.
03.5
004.
005.
008.
001.
1.25
01.5
1.75
007 .
440 Series,
AGENCY FILE NUMBER
Ampere Rating
Rating (V)
Voltage
0.25A - 8A
0.25A - 8A
Max.
125
125
63
63
50
50
50
32
32
32
32
32
32
32
32
32
LR 29862
E10480
50 A @ 125 V AC/DC
Interrupting Rating
50 A @ 63 V AC/DC
50 A @ 63 V AC/DC
50 A @ 32 V AC/DC
50 A @ 50 V DC
50 A @ 50 V AC
(AC/DC)
1206 High I
Opening Time at 25ºC
5 secs., Maximum
4 hours, Minimum
1
AMPERE RANGE
Surface Mount Fuses
Ceramic Fuse > 440 Series
.25A - 8A
.25A - 8A
Resistance
2
Nominal
(Ohms)
t Fuse
0.04518
0.03802
0.02850
0.02252
0.00753
0.00634
0.01845
0.01553
0.01164
0.4624
0.3096
0.2268
0.8140
0.1759
2.140
1.216
Revised: January 24, 2011
2
Melting I
Nominal
(A
0.00649
0.02642
0.40200
0.50652
0.01455
0.09312
0.21054
1
0.3312
0.4326
0.8191
8.464
12.95
1.232
1.789
2.601
4.761
2
Sec.)
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
Derating Curve”for additional derating information.
Devices designed to be mounted with marking code facing up.
Description
The 440 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 temperatures up to 150ºC and high inrush
currents.
The general design ensures excellent temperature stability
and performance reliability.
This high I
inrush current withstand capability to avoid nuisance fuse
open.
Features
Applications
3
2
t
from -55ºC to +150ºC
compliant and Halogen-
free
Nominal Voltage
Drop At Rated
Current (V)
2
0.5260
0.4993
0.4831
0.3983
0.3457
0.3240
0.3215
0.0777
0.0792
0.0747
0.0742
0.0757
0.0709
0.0654
0.0696
0.0655
t fuse series is designed to have ultra high
4
Rated Current (W)
Nominal Power
Dissipation At
0.132
0.187
0.242
0.299
0.346
0.405
0.482
0.136
0.158
0.187
0.223
0.265
0.284
0.327
0.487
0.524
and lead-free reflow /
wave soldering
Agency Approvals
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
2
t values
440 Series
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X