Surface Mount Fuses
Thin Film > 0603 Size > Fast-Acting > 494 Series
494 Series Fuse, NRA Special Series Integrated Circuit Protector
®
Description
5IFꢀꢂ94ꢀ4FSJFTꢀ'BTUꢁ"DUJOHꢀ4.'ꢀJTꢀBOꢀVMUSBꢀTNBMMꢀꢅꢇꢈꢇꢃꢀ
TJ[FꢆꢀUIJOꢁåMNꢀEFWJDFꢀEFTJHOFEꢀGPSꢀTFDPOEBSZꢀQSPUFDUJPOꢀ
PGꢀDJSDVJUTꢀVTFEꢀJOꢀTQBDFꢀDPOTUSBJOFEꢀBQQMJDBUJPOTꢀTVDIꢀ
BTꢀIBOEꢁIFMEꢀQPSUBCMFꢀFMFDUSPOJDꢀEFWJDFTꢍꢀ5IJTꢀTFSJFTꢀJTꢀ
ꢄꢇꢇꢉꢀMFBEꢁGSFFꢀBOEꢀNFFUTꢀUIFꢀSFRVJSFNFOUTꢀPGꢀUIFꢀ3P)4ꢀ
EJSFDUJWFꢍꢀ/FXꢀ)BMJEFꢁ'SFFꢀꢂꢎꢂꢀ4FSJFTꢀGVTFTꢀBSFꢀBWBJMBCMFꢀ
UPꢀPSEFSꢀVTJOHꢀUIFꢀi)'wꢀTVGåYꢍꢀ4FFꢀ1BSUꢀ/VNCFSJOHꢀTFDUJPOꢀ
GPSꢀBEEJUJPOBMꢀJOGPSNBUJPOꢍ
Features
tꢀ $PNQBUJCMFꢀXJUIꢀMFBEꢁ
GSFFꢀTPMEFSTꢀBOEꢀIJHIFSꢀ
UFNQFSBUVSFꢀQSPåMFT
tꢀ &MFNFOUꢁDPWFSJOHꢀNBUFSJBMꢀ
JTꢀSFTJTUBOUꢀUPꢀJOEVTUSZꢀ
TUBOEBSEꢀDMFBOJOHꢀ
Agency Approvals
PQFSBUJPOT
tꢀ )JHIꢀQFSGPSNBODFꢀ
NBUFSJBMTꢀQSPWJEFꢀ
AGENCY
AGENCY FILE NUMBER
AMPERE RANGE
250mA - 5A
tꢀ .PVOUJOHꢀQBEꢀBOEꢀ
JNQSPWFEꢀQFSGPSNBODFꢀ
JOꢀFMFWBUFEꢀBNCJFOUꢀ
UFNQFSBUVSFꢀBQQMJDBUJPOT
FMFDUSJDBMꢀQFSGPSNBODFꢀBSFꢀ
JEFOUJDBMꢀUPꢀ-JUUFMGVTFꢀꢂꢃꢄꢀ
BOEꢀꢂꢃꢂꢀ4FSJFTꢀQSPEVDUT
E10480
®
LR29862
250mA - 5A
tꢀ .BSLFEꢀPOꢀUPQꢀTVSGBDFꢀ
tꢀ "MMPZꢁCBTFEꢀFMFNFOUꢀ
XJUIꢀDPEFꢀUPꢀBMMPXꢀBNQFSFꢀ DPOTUSVDUJPOꢀQSPWJEFTꢀ
SBUJOHꢀJEFOUJåDBUJPOꢀ
XJUIPVUꢀUFTUJOH
TVQFSJPSꢀJOSVTIꢀXJUITUBOEꢀ
DIBSBDUFSJTUJDTꢀꢅ*2UꢆꢀPWFSꢀ
DFSBNJDꢀPSꢀHMBTTꢁCBTFEꢀ
ꢇꢈꢇꢃꢀGVTFꢀQSPEVDUT
Electrical Characteristics for Series
tꢀ -PXꢀQSPåMFꢀGPSꢀIFJHIUꢀ
TFOTJUJWFꢀBQQMJDBUJPOT
% of Ampere
OpeningTime at 25OC
ꢂꢀIPVSTꢊꢀ.JOJNVN
Rating
tꢀ 'MBUꢀUPQꢀTVSGBDFꢀGPSꢀQJDLꢁ
BOEꢁQMBDFꢀPQFSBUJPOT
ꢄꢇꢇꢉ
ꢋꢇꢇꢉ
ꢃꢇꢇꢉ
ꢄꢌꢀTFDꢍꢊꢀ.BYJNVN
ꢇꢍꢋꢀTFDꢍꢊꢀ.BYJNVN
Applications
4FDPOEBSZꢀQSPUFDUJPOꢀGPSꢀTQBDFꢀDPOTUSBJOFEꢀBQQMJDBUJPOTꢏ
tꢀ $FMMꢀQIPOFT
tꢀ %JHJUBMꢀDBNFSBT tꢀ )BSEꢀEJTLꢀ
ESJWFT
tꢀ #BUUFSZꢀQBDLT
tꢀ %7%ꢀQMBZFST
Electrical Specifications by Item
Max
Nom
Voltage
Drop
Nom
Power
Dissipation
(W)
Agency Approvals
Ampere
Rating
(A)
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
Amp
Code
Voltage
Rating
(V)
Interrupting
Rating
I2t (A2sec)
®
(mV)
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ꢇꢍꢃꢈꢃꢌ
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
ꢌꢇ"ꢀ!ꢃꢋ7ꢀ"$ꢐ%$
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ꢃꢌ"ꢀ!ꢃꢋ7ꢀ"$ꢐ%$
1. Measured at 10% of rated current, 25ºC.
© 2009 Littelfuse, Inc.
2. Measured at rated voltage.
494 Series
1
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/494.html for current information.
Revised: July 6, 2009