© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/25/14
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 250mA - 5A
LR29862 250mA - 5A
Electrical Characteristics for Series
Features
• Compatiblewithlead-
freesoldersandhigher
temperatureproles
• Highperformance
materialsprovide
improvedperformance
inelevatedambient
temperatureapplications
• Markedontopsurface
withcodetoallowampere
ratingidentication
withouttesting
• Lowproleforheight
sensitiveapplications
• Flattopsurfaceforpick-
and-placeoperations
• Element-coveringmaterial
isresistanttoindustry
standardcleaning
operations
• Mountingpadand
electricalperformanceare
identicaltoLittelfuse431
and434Seriesproducts
• Alloy-basedelement
constructionprovides
superiorinrushwithstand
characteristics(I2t)over
ceramicorglass-based
0603fuseproducts
% of Ampere
Rating Opening Time at 25OC
100% 4hours,Minimum
200% 5sec.,Maximum
300% 0.2sec.,Maximum
Applications
The494SeriesFast-ActingSMFisanultrasmall(0603
size)thin-lmdevicedesignedforsecondaryprotection
ofcircuitsusedinspaceconstrainedapplicationssuch
ashand-heldportableelectronicdevices.Thisseriesis
100%lead-freeandmeetstherequirementsoftheRoHS
directive.NewHalide-Free494Seriesfusesareavailable
toorderusingthe“HF”sufx.SeePartNumberingsection
foradditionalinformation.
• Cellphones
• Batterypacks
• Digitalcameras
• DVDplayers
• Harddisk
drives
Secondaryprotectionforspaceconstrainedapplications:
Ampere
Rating
(A)
Amp
Code
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2sec)
Nom
Voltage
Drop
(mV)
Nom
Power
Dissipation
(W)
Agency Approvals
0.250 .250 32
50A@32VAC/DC
0.5450 0.0030 158.56 0.0396 x x
0.375 .375 32 0.2900 0.0053 128.03 0.0480 x x
0.500 .500 32 0.1870 0.0087 115.71 0.0579 x x
0.750 .750 32 0.1170 0.0171 107.33 0.0805 x x
1. 0 0 0 01. 32 0.0710 0.0212 89.10 0.0891 x x
1.25 1.25 32
35A@32VAC/DC
0.0530 0.0518 84.32 0.1054 x x
1.40 01. 4 32 0.049 0.05529 74.84 0.1048 x x
1.50 01.5 32 0.0410 0.0766 81.14 0.1217 x x
1.75 1.75 32 0.0320 0.0903 78.75 0.1378 x x
2.00 002. 32 0.0300 0.1103 78.22 0.1564 x x
2.50 02.5 32 0.0220 0.1440 76.10 0.1903 x x
3.00 003. 32 0.0180 0.2403 75.04 0.2251 x x
3.15 3.15 32 0.017 0.27405 63.78 0.2009 x x
3.50 03.5 32 0.0150 0.4306 74.25 0.2599 x x
4.00 004. 32 0.0130 0.5760 73.72 0.2949 x x
5.00 005. 32 0.0090 0.9000 72.71 0.3635 x x
Electrical Specifications by Item
1. Measured at 10% of rated current, 25ºC. 2. Measured at rated voltage.
RoHS
Pb
Additional Information
Datasheet Samples
Resources