MIL-PRF-19500/371H
* 4.3.3 Dielectric withstanding voltage.
a.
Magnitude of test voltage....................................900 V dc.
b.
Duration of application of test voltage....................15 seconds (min).
c.
Points of application of test voltage........................All leads to case (bunch connection).
d.
Method of connection.........................................Mechanical.
e.
Kilovolt-ampere rating of high voltage source..........1,200 V/1.0 mA (min).
f.
Maximum leakage current....................................1.0 mA.
g.
Voltage ramp up time...................................................500 V/second.
4.4 Conformance inspection. Conformance inspection shall be in accordance with MIL-PRF-19500.
4.4.1 Group A inspection. Group A inspection shall be conducted in accordance with MIL-PRF-19500, and table I
herein. Electrical measurements (end-points) shall be in accordance with applicable inspections of table I,
subgroup 2 herein. Delta measurements shall be in accordance with table II herein.
4.4.2 Group B inspection. Group B inspection shall be conducted in accordance with the conditions specified for
subgroup testing in table E-VIB (JAN, JANTX, and JANTXV) of MIL-PRF-19500 and herein. Electrical measurements
(end-points) shall be in accordance with the applicable inspections of table I, subgroup 2 herein.
Subgroup
Method
Condition
B3
1037
VCB = 10-30 V dc, ton = toff = 3 minutes, 2,000 cycles.
4.4.3 Group C inspection. Group C inspection shall be conducted in accordance with the conditions specified for
subgroup testing in table E-VII of MIL-PRF-19500, and as follows. Electrical measurements (end-points) shall be in
accordance with table I, subgroup 2 herein.
Subgroup
Method
Condition
C2
2036
Test condition A, weight = 10 pounds, t = 15 s.
See 4.5.2, RθJC = 1.25°C/W for 2N3902, 2N5157; RθJC = 1.0°C/W for 2N3902T1,
C5
3131
2N5157T1; and RθJC = 1.30°C/W for 2N3902T3 and 2N5157T3.
VCB = 10-30 V dc, ton = toff = 3 minutes, 6,000 cycles.
C6
1037
4.4.4 Group E inspection. Group E inspection shall be conducted in accordance with the conditions specified for
subgroup testing in table E-IX of MIL-PRF-19500 and as specified in table II herein. Electrical measurements (end-
points) shall be in accordance with table I, subgroup 2 herein.
4.5 Method of inspection. Methods of inspection shall be as specified in the appropriate tables and as follows:
4.5.1 Pulse measurements. Conditions for pulse measurement shall be as specified in section 4 of MIL-STD-750.
4.5.2 Thermal resistance. The thermal resistance measurements shall be performed in accordance with method
3131 of MIL-STD-750 using the guidelines in that method for determining IM, IH, tH, tSW (and VH where appropriate).
Measurement delay time (tMD) = 70 µs max. See MIL-PRF-19500, table E-IX, group E, subgroup 4.
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