Littelfuse 494 Series - Manual (Page 3)

© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/19/13
Surface Mount Fuses
Thin Film > 0603 Size > Fast-Acting > 494 Series
Materials
Body: Advanced High Temperature Substrate
Terminations: 100% Tin over Nickel over Copper
Element Cover Coat: Conformal Coating
Operating
Temperature
– 55°C to 90°C. Consult temperature rerating
curve chart. For operation above 90°C contact
Littelfuse.
Humidity MIL-STD-202F, Method 103B, Condition D
Thermal Shock Withstands 5 cycles of – 55°C to 125°C
Vibration Per MIL-STD-202F
Insulation Resistance
(After Opening)
Greater than 10,000 ohms
Resistance to
Soldering Heat Withstands 60 seconds above 200°C
and up to 260°C, maximum
Product Characteristics
Dimensions Part Marking System
1.09
(.043")
REFLOW SOLDER
1.60
(.063")
.305
(.012")
.279
(.011")
.18
(.007")
.127
(.005")
MARKING CODE VARIES
WITH AMPERAGE RATING
(SEE CHART)
R
REF.
1.02
(.040")
.762
(.030")
2.54
(.100")
1.09
(.043")
WAVE SOLDER
3.20
(.126")
1.09
(.043")
1.02
(.040")
.813
(.032")
Sn
Sn
Cu
Sn
Coating
Amp
Code
marking
Code
.250 D
.375 E
.500 F
.750 G
001. H
1.25 J
01.5 K
1.75 L
002. N
02.5 O
003. P
03.5 R
004. S
005. T
Part Numbering System
Packaging
packaging Option packaging Specification Quantity
Quantity &
packaging Code
8mm Tape and Reel EIA RS-481-2 (IEC 286, part 3) 5000 NR
0494002.NRHF
SERIES
AMP Code
‘HF’ SUFFIX HALIDE
FREE ITEM
PACKAGING Code
Refer to Amp Code column in the
Electrical Specifications table.
NOTE: The dot is poisitioned before
the Packaging Suffix with whole
ratings and within the numbering
sequence for fractional ratings.
NR = Tape and Reel, 5000 pcs