Brochure

© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
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
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 0 01. 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 0.2265 0.379 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
0.0450 0.3312 0.0777 0.136 x X
2 002. 32 0.0385 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 0.0120 4.761 0.0654 0.327 x X
7 0 0 7. 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. Contact Littelfuse if application transient surges are less than 1 ms.
4. Nominal Voltage Drop measured at rated current after temperature has stabilized.
RoHS
Pb
• 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.
Application testing is strongly recommended.
Additional Information
Datasheet
Samples
Resources