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Revision: February 13, 2008
Surface Mount Fuses
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for the most current information
Thin Film > 1206 Size > Very Fast Acting > 433 Series
433 Series
433 Series Fuse
Description
The 433 series fast-acting surface mount fuse series
is a small (1206 size) thin-film device designed for
secondary protection of circuits used in space constrained
applications such as hand-held portable electronic devices.
For RoHS compliant and lead-free design, please refer to
the Littelfuse 466 series thin film fuse. For new designs of
7 amp please refer to Littelfuse 429 series thin film fuse.
Agency Approvals
®
®
Agency Agency File Number Ampere Range
®
E10480 125mA - 5A
®
LR29862 125mA - 5A
Features
Electrical Characteristics for Series
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fuse is an extremely
small, low profile design
(1206 chip size) utilizing
thin-film technology to
achieve precise control of
electrical characteristics.
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produces a flat surface for
improved performance in
pick-and-place operations
and an alternate solution
for height critical
application.
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electrical specification are
identical to the popular
429 Series specifications.
% of Ampere
Rating
Opening Time at 25
O
C
100% 4 hours, Minimum
200% 5 sec., Maximum
300% 0.2 sec., Maximum
Applications
Ampere
Rating
(A)
Amp
Code
Max
Voltage Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I
2
t (A
2
sec)
Agency Approvals
®
0.125 .125 125
50A @125 V AC/DC
3.45000 0.00040 x x
0.200 .200 125 0.93800 0.00055 x x
0.250 .250 125 0.62500 0.00100 x x
0.375 .375 125 0.37500 0.00280 x x
0.50 .500 63
50A @63 V AC/DC
0.24050 0.00600 x x
0.60 .600 63 0.21000 0.01310 x x
0.75 .750 63 0.13700 0.01700 x x
0.80 .800 63 0.12250 0.03050 x x
1.00 001. 63 0.09950 0.03500 x x
1.25 1.25 63 0.07475 0.06500 x x
1.50 01.5 63 0.06250 0.12500 x x
1.75 1.75 63 0.05000 0.15000 x x
2.00 02.0 63 0.03975 0.23000 x x
2.50 02.5 32
50A @32 V AC/DC
0.03065 0.50000 x x
3.00 03.0 32 0.02625 0.70000 x x
4.00 04.0 24
50A @24 V AC/DC
0.01400 1.0240 x x
5.00 05.0 24 0.01100 1.6000 x x
Electrical Specifications by Item
1. Measured at 10% of rated current, 25ºC.
2. Measured at rated voltage.
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Secondary protection for space constrained applications
such as:
