Brochure
Table Of Contents
© 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
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 re-rating
curve chart. For operation above 90°C contact
Littelfuse.
Humidity MIL-STD-202, Method 103, Condition D
Thermal Shock Withstands 5 cycles of – 55°C to 125°C
Vibration Per MIL-STD-202
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±0.102
(.063"±0.004")
0.330±0.102
(.013"±0.004")
0.279±0.076
(.011"±0.003")
.18
(.007")
0.127±0.102
(.005"±0.004")
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")
0.813±0.076
(.032"±0.003")
Sn
Sn
Cu
Sn
Coating
Amp
Code
Marking
Code
.250 D
.375 E
.500 F
.750 G
0 01. H
1.25 J
01. 4
01.5 K
1.75 L
002. N
02.5 O
003. P
3.15
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
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.