Brochure

© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Surface Mount Fuses
Thin Film > 0603 Size > Fast-Acting > 494 Series
494 Series Fuse, NRA Special Series Integrated Circuit Protector
Description
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RANGE
®
E10480 0.25A - 5A
29862 0.25A - 5A
Electrical Characteristics for Series
Features
• Compatible with lead-
free solders and higher
temperature profiles
• High performance
materials provide
improved performance
in elevated ambient
temperature applications
• Marked on top surface
with code to allow ampere
rating identification
without testing
• Low profile for height
sensitive applications
• Flat top surface for pick-
and-place operations
• Element-covering material
is resistant to industry
standard cleaning
operations
• Mounting pad and
electrical performance are
identical to Littelfuse 431
and 434 Series products
• Alloy-based element
construction provides
superior inrush withstand
characteristics (I
2
t) over
ceramic or glass-based
0603 fuse products
% of Ampere
Rating
Opening Time at 25
O
C
100% 4 hours, Minimum
200% 5 sec., Maximum
300% 0.2 sec., Maximum
Applications
®
The 494 Series Fast-Acting SMF is an ultra small (0603
size) thin-film device designed for secondary protection
of circuits used in space constrained applications such
as hand-held portable electronic devices. This series is
100% lead-free and meets the requirements of the RoHS
directive. New Halide-Free 494 Series fuses are available
to order using the “HF” suffix. See Part Numbering section
for additional information.
• Cell phones
• Battery packs
• Digital cameras
• DVD players
• Hard disk
drives
Secondary protection for space constrained applications:
Ampere
Rating
(A)
Amp
Code
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I
2
t (A
2
sec)
Nom
Voltage
Drop
(mV)
Nom
Power
Dissipation
(W)
Agency Approvals
®
0.250 .250 32
50A @32V AC/DC
0.5900 0.0014 158.56 0.0396 x x
0.375 .375 32 0.3100 0.0035 128.03 0.0480 x x
0.500 .500 32 0.1895 0.0087 138.50 0.0693 x x
0.750 .750 32 0.1185 0.0171 123.30 0.0925 x x
1. 0 0 0 01. 32 0.0780 0.0212 67.40 0.0674 x x
1.25 1.25 32
35A @32V AC/DC
0.0615 0.0518 84.32 0.1054 x x
1.40 01. 4 32 0.0475 0.05529 74.84 0.1048 x x
1.50 01.5 32 0.0405 0.0766 71.60 0.1074 x x
1.75 1.75 32 0.0340 0.0903 78.75 0.1378 x x
2.00 002. 32 0.0270 0.1891 78.22 0.1564 x x
2.50 02.5 32 0.0220 0.2066 76.10 0.1903 x x
3.00 003. 32 0.0185 0.2403 75.04 0.2251 x x
3.15 3.15 32 0.0150 0.27405 63.78 0.2009 x x
3.50 03.5 32 0.0105 0.4306 65.30 0.2286 x x
4.00 004. 32 0.0130 0.8410 63.10 0.2524 x x
5.00 005. 32 0.0090 0.9000 61.20 0.3060 x x
Electrical Specifications by Item
1. Measured at 10% of rated current, 25ºC. 2. Measured at rated voltage.
RoHS
Pb
Specifications are subject to change without notice. Application testing is strongly recommended.
Additional Information
Datasheet
Samples
Resources