0440005.WR Datasheet, PDF (1/3 Pages) Littelfuse – Surface Mount Fuses Ceramic Fuse > 440 Series

Surface Mount Fuses
Ceramic Fuse > 440 Series
440 Series, 1206 High I²t Fuse
Agency Approvals
Agency
Agency File Number
E10480
LR 29862
Ampere Range
.25A - 8A
.25A - 8A
Electrical Characteristics for Series
% of Ampere
Rating
100%
350%
Ampere Rating
0.25A - 8A
0.25A - 8A
Opening Time at 25ºC
4 hours, Minimum
5 secs., Maximum
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 I²t fuse series is designed to have ultra high
inrush current withstand capability to avoid nuisance fuse
open.
Features
• 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 I²t values
Applications
• Automotive Electronics
• LCD Displays
• Servers
• Notebook Computers
• Printers
• Scanners
• Data Modems
• Hard Disk Drives
Electrical Specifications by Item
Ampere
Rating
(A)
0.25
0.375
0.5
0.75
1
1.25
1.5
1.75
2
2.5
3
3.5
4
5
7
8
Amp
Code
.250
.375
.500
.750
001.
1.25
01.5
1.75
002.
02.5
003.
03.5
004.
005.
007.
008.
Max.
Voltage
Rating (V)
125
125
63
63
50
50
50
32
32
32
32
32
32
32
32
32
Interrupting Rating
(AC/DC)¹
Nominal
Resistance
(Ohms)²
50 A @ 125 V AC/DC
50 A @ 63 V AC/DC
50 A @ 63 V AC/DC
50 A @ 50 V DC
50 A @ 50 V AC
50 A @ 32 V AC/DC
2.140
1.216
0.8140
0.4624
0.3096
0.2268
0.1759
0.04518
0.03802
0.02850
0.02252
0.01845
0.01553
0.01164
0.00753
0.00634
Nominal Nominal Voltage Nominal Power ^{Agency Approvals}
Melting I²t Drop At Rated Dissipation At
(A²Sec.)³
Current (V)⁴ Rated Current (W)
0.00649
0.01455
0.02642
0.09312
0.21054
0.40200
0.50652
0.3312
0.4326
0.8191
1.232
1.789
2.601
4.761
8.464
12.95
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
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
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
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
Derating Curve”for additional derating 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/440.html for current information.
1
Revised: June 23, 2011
440 Series