Brochure

© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
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 AMPERE RANGE
E10480 0.250A – 6A
29862 0.250A – 6A
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
% of Ampere
Rating
Ampere Rating Opening Time at 25ºC
100% 0.250A – 6A 4 Hours, Minimum
250% 0.250A – 6A 5 Seconds, Maximum
Applications
Ampere
Rating
(A)
Amp
Code
Max.
Voltage
Rating (V)
Interrupting Rating
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 63VDC
50A @ 63VDC
50A @ 32VAC
2.218 0.0017 0.550 0.138 x x
0.375 .375 63VDC 1.247 0.0041 0.488 0.183 x x
0.5 .500 63VDC 0.829 0.010 0 0.486 0.243 x x
0.75 .750 63VDC 0.466 0.0281 0.378 0.284 x x
1 0 01. 63VDC 0.310 0.0593 0.351 0.351 x x
1.25 1.25 63VDC 0.200 0.0510 0.365 0.456 x x
1. 5 01. 5 63VDC 0.174 0.0902 0.368 0.552 x x
1.75 1.75 63VDC 1.405 0.1440 0.360 0.540 x x
2 002. 32
50A @ 32VDC/12VAC
0.051 0.1490 0.107 0.214 x x
2.5 02.5 32 0.0324 0.1977 0.095 0.238 x x
3 003. 32 0.0255 0.2922 0.093 0.279 x x
3.5 03.5 32 0.0205 0.4752 0.082 0.287 x x
4 004. 32 0.0170 0.6920 0.079 0.316 x x
5 005. 32 0.0115 0.7398 0.074 0.370 x x
6 006. 24 50A @ 24VDC/12VAC 0.0085 1.3838 0.072 0.432 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.
RoHS
Pb
• Handheld Electronics
• LCD Displays
• Battery Packs
• Hard Disk Drives
• SD Memory Cards
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
Re-rating Curve”for additional re-rating information.
Devices designed to be mounted with marking code facing up.
Specifications are subject to change without notice. Application testing is strongly recommended.
Additional Information
Datasheet
Samples
Resources