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© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/03/17
Surface Mount Fuses
Ceramic Fuse > 437 Series
Materials
Body: Advanced Ceramic
Terminations: Ag / Ni / Sn (100% Lead-free)
Element Cover Coating: Ceramic/Lead-free
Glass
Moisture
Sensitivity Level
IPC/JEDEC J-STD-020, Level 1
Solderability IPC/EIC/JEDEC J-STD-002, Condition B
Humidity Test MIL-STD-202, Method 103, Condition D
Resistance to
Solder Heat
MIL-STD-202, Method 210, Condition B
Moisture
Resistance
MIL-STD-202, Method 106
Product Characteristics
Thermal Shock
MIL-STD-202, Method 107,
Condition B
Mechanical Shock
MIL-STD-202, Method 213,
Condition A
Vibration MIL-STD-202, Method 201
Vibration,
High Frequency
MIL-STD-202, Method 204,
Condition D
Dissolution of
Metallization
IPC/EIC/JEDEC J-STD-002,
Condition D
Terminal Strength IEC 60127-4
Dimensions
0.520 ± 0.200
[0.020 ± 0.008]
3.200 ± 0.1778
[0.126 ± 0.007]
1. 000
[0.039]
1.63 +0.10 / -0.2
[0.064 +0.004 / -0.008]
1.500
[0.059]
1.800
[0.071]
3.500
[0.138]
1. 000
[0.039]
0.8179 +0.046 / -0.076
[0.0322 +0.0018 / -0.003]
3.200 ± 0.1778
[0.126 ± 0.007]
1.63 +0.10 / -0.2
[0.064 +0.004 / -0.008]
N
H
Packaging
Part Marking System
Packaging
Option
Packaging
Specification
Quantity
Quantity &
Packaging Code
8mm Tape
and Reel
EIA-481, IEC
60286-3
3000 WR
Part Numbering System
0437 008. W R
SERIES
AMP CODE
QUANTITY CODE
PACKING CODE
W = 3000 pcs
R = Reel Pack
Amp Code Marking Code
.250 D
.375 E
.500 F
.750 G
0 01. H
1.25 J
01. 5 K
1.75 L
Amp Code Marking Code
002. N
02.5 O
003. P
03.5 R
004. S
005. T
0 0 7. W
008. X
O
N
P
R
S
T
W
X
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