MIL-PRF-23419/8J
Verification: The following tests shall be conducted on 100 percent of the units, in the order shown,
prior to any tests referenced in MIL-PRF-23419. Nonconforming units shall be removed from the lot.
a. Seal - Immerse in a clear mineral oil bath at +125° C for 1 minute. No bubbles shall be
detected. (See method 112, MIL-STD-202, test condition A.)
b. Voltage drop - See table I.
c.
Resistance - See table I.
d. Visual and mechanical - Inspection shall be by 3X minimum magnification.
Extent of qualification: Qualification may be extended to style FM04 fuses to those qualified for style
FM08 fuses.
Solderability: Fuses shall be tested in accordance with MIL-PRF-23419. Gold plated leads shall
have the gold removed by single or double dipping into a flowing or nonflowing hot solder of sufficient
volume to assure complete gold removal.
Resistance to soldering heat: Fuses shall be tested in accordance with MIL-PRF-23419.
Marking: Fuses shall be marked with the manufacturer's name or trademark and current rating only.
Part or Identifying Number (PIN): The PIN is derived from table I and shall be as shown in table IV.
TABLE I. Style FM08 PIN designation, electrical parameters, and lead dimensions.
Cold resistance
Voltage drop
PIN designation 1/ 2/
Lead diameter
(ohms) 3/
(volts) 4/
Current
Characteristic Maximum
Inches
mm
Minimum
Maximum
Minimum
Maximum
rating
(± 0.002)
(± 0.05)
voltage
(amperes)
A
125 + 2V
1/8A
1.89
2.31
.850
1.15
.025
.64
A
125 + 2V
1/4A
.639
.781
.590
.800
.025
.64
A
125 + 2V
3/8A
.378
.462
.527
.713
.025
.64
A
125 + 2V
1/2A
.252
.308
.488
.660
.025
.64
A
125 + 2V
3/4A
.153
.187
.145
.197
.025
.64
A
125 + 2V
1A
.112
.138
.157
.213
.025
.64
A
125 + 2V
1 1/2A
.072
.088
.153
.207
.025
.64
A
125 + 2V
2A
.0495
.0605
.144
.196
.025
.64
A
125 + 2V
2 1/2A
.0378
.0462
.125
.169
.025
.64
A
125 + 2V
3A
.0315
.0388
.139
.187
.025
.64
A
125 + 2V
4A
.0207
.0253
.110
.150
.025
.64
A
125 + 2V
5A
.0126
.0154
.087
.118
.025
.64
A
125 + 2V
7A
.0090
.0110
.087
.118
.025
.64
A
125 + 2V
10A
.0059
.0070
.085
.110
.025
.64
A
32V
15A
.0036
.0044
.065
.087
.032
.82
1/
Add "T" suffix to PIN designation if optional solder coated leads are required.
2/
Example of complete PIN designation with optional lead finish: FM08A125V1/2AT.
3/
Cold resistance is measured at 10 percent or less of rated current.
4/
Voltage drop is measured after the fuse has been subjected to rated current for not less than one
minute.
3
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