Littelfuse 440 Series User Manual
Surface mount fuses, T fuse, Ceramic fuse > 440 series
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
Surface Mount Fuses
Ceramic Fuse > 440 Series
440 Series, 1206 High I
2
t Fuse
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
2
t fuse series
is designed to have ultra high inrush current withstand
capability to avoid nuisance fuse open.
Agency Approvals
AgeNCy
AgeNCy FIle NumbeR
AmpeRe RANge
e10480
.25A - 8A
lR 29862
.25A - 8A
Features
Electrical Characteristics for Series
• Operating Temperature
from -55ºC to +150ºC
• 100% Lead-free, RoHS
compliant and Halogen-free
• Suitable for both leaded
and lead-free reflow / wave
soldering
• Ultra high I
2
t values
% of Ampere
Rating
Ampere Rating
Opening Time at 25ºC
100%
0.25A - 8A
4 hours, Minimum
350%
0.25A - 8A
5 secs., Maximum
Applications
Ampere
Rating
(A)
Amp
Code
max.
Voltage
Rating (V)
Interrupting Rating
(AC/DC)
1
Nominal
Resistance
(Ohms)
2
Nominal
melting I
2
t
(A
2
Sec.)
3
Nominal Voltage
Drop At Rated
Current (V)
4
Nominal power
Dissipation At
Rated Current (W)
Agency Approvals
0.25
.250
125
50 A @ 125 V AC/DC
2.140
0.00649
0.5260
0.132
x
X
0.375
.375
125
1.216
0.01455
0.4993
0.187
x
X
0.5
.500
63
50 A @ 63 V AC/DC
0.8140
0.02642
0.4831
0.242
x
X
0.75
.750
63
50 A @ 63 V AC/DC
0.4624
0.09312
0.3983
0.299
x
X
1
001.
50
50 A @ 50 V DC
50 A @ 50 V AC
0.3096
0.21054
0.3457
0.346
x
X
1.25
1.25
50
0.2268
0.40200
0.3240
0.405
x
X
1.5
01.5
50
0.1759
0.50652
0.3215
0.482
x
X
1.75
1.75
32
50 A @ 32 V AC/DC
0.04518
0.3312
0.0777
0.136
x
X
2
002.
32
0.03802
0.4326
0.0792
0.158
x
X
2.5
02.5
32
0.02850
0.8191
0.0747
0.187
x
X
3
003.
32
0.02252
1.232
0.0742
0.223
x
X
3.5
03.5
32
0.01845
1.789
0.0757
0.265
x
X
4
004.
32
0.01553
2.601
0.0709
0.284
x
X
5
005.
32
0.01164
4.761
0.0654
0.327
x
X
7
007.
32
0.00753
8.464
0.0696
0.487
x
X
8
008.
32
0.00634
12.95
0.0655
0.524
x
X
Electrical Specifications by Item
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.
• LCD Displays
• Servers
• Notebook Computers
• Printers
• Scanners
• Data Modems
• Hard Disk Drives
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.
Additional Information