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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Surface Mount Fuses
Thin Film > 1206 Size > Very Fast-Acting > 429 Series
Materials
Body: Epoxy Substrate
Terminations, RoHS Compliant Device (429L):
100% Tin over Nickel over Copper
Element Cover Coat: Conformal Coating
NOTE: Do not use alcohol-based cleaners or
solvents with 429 Series Thin-Film Fuses as it
may damage the coating.
Operating
Temperature
– 55
O
C to 90
O
C.
Consult temperature re-rating chart.
For operation above 90°C contact Littelfuse.
Thermal Shock Withstands 5 cycles of – 55
O
C to 125
O
C
Humidity
MIL-STD-202, Method 103
Condition D
Vibration
Withstands 10 – 55 Hz per MIL-
STD-202, Method 201 and 10-2000
Hz at 20 g’s per MIL-STD-202, Method
204, Condition D.
Insulation Resistance
(After Opening)
Greater than 10,000 ohms
Resistance to
Soldering Heat
MIL-STD-202, Method 210,
Condition D
Product Characteristics
Dimensions
REFLOW SOLDER
RECOMMENDED PAD LAYOUTS
3.81
(.150")
1.52
(.060")
2.03
(.080")
.635
(.025")
1.143+0.0/-0.152
(.045"+0.0/-0.006")
2.489±0.254
(0.098"±0.010")
1.52±0.127
(0.060"±0.005")
3.175±0.127
(0.125"±0.005")
1.14
(.045")
1.12
(.044")
REF.
Part Numbering System
Packaging
Part Marking System
Packaging Option Packaging Specification Quantity
Quantity &
Packaging Code
Tape & Reel – 8mm tape EIA-481 Rev. D (IEC 60286, part 3) 3000 WRM
Series
Marking
Code
429L 7
0429 007. WRM L HF
SERIES
AMP Code
QUANTITY Code
L = Lead-Free device and
RoHS compliant device
Refer to Amp Code Column of
Electrical characteristics table
WRM = 3000 pieces, Tape and Reel
‘HF’ SUFFIX
HALOGEN FREE ITEM
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.