MIL-PRF-19500/627C
* 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. See table III for delta limits when applicable.
* 4.4.3.1 Group C inspection, table E-VII of MIL-PRF-19500.
Subgroup
Method
Condition
-0°C to +100°C, 10 cycles.
C2
1056
-55°C to +175°C, 25 cycles.
C2
1051
Axial devices - Tension: Test condition A; weight = 12 pounds; t = 30 seconds.
C2
2036
Lead fatigue: Test condition E; weight 2 pounds, t = 15 s.
NOTE: Lead fatigue is not applicable for US devices.
*
C2
2038
US devices - Condition B, 12 pounds, t = 30s.
C5
4081
(maximum) ≤ 4°C/W; L = .375 inch (9.53 mm). For surface mount devices
(US version), RθJEC ≤ 3.5°C/W.
C6
1027
Delta shall not exceed 25 percent of initial reading.
* 4.4.4 Group E inspection. Group E inspection shall be conducted in accordance with the conditions specified for
subgroup testing in appendix E, table E-IX of MIL-PRF-19500 and as specified herein. See table III for delta limits
when applicable.
4.5 Methods of inspection. Methods of inspection shall be as specified in the appropriate tables 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 Inspection conditions. Unless otherwise specified, all inspections shall be conducted at TA = room ambient
4.5.3 Burn-in and life tests. These tests shall be conducted with a half-sine waveform of the specified peak voltage
impressed across the diode in the reverse direction followed by a half-sine waveform of the specified average
rectified current. The forward conduction angle of the rectified current shall be neither greater than 180 degrees, nor
less than 150 degrees.
4.5.3.1 Free air burn-in. The use of a current limiting or ballast resistor is permitted provided that each DUT still
sees the full Pt (minimum) and that the minimum applied voltage, where applicable, is maintained through-out the
burn-in period. TJ = +115°C minimum and +150°C maximum for screening, and TJ = +125°C minimum for 4.4.2.2
4.5.4 Scope display evaluation. Scope display evaluation shall be stable in accordance with method 4023 of
MIL-STD-750. Scope display may be performed on ATE (automatic test equipment) for screening only with the
approval of the qualifying activity. Scope display in table I, subgroup 4 shall be performed on a scope. Reverse
current (IBR) over the knee shall be 500 µA peak.
4.5.5 Thermal resistance. Thermal resistance measurement shall be performed in accordance with method 4081
of MIL-STD-750 using the guidelines in that method for determining IM, IH, and tH. Measurement delay time tMD = 100
µs max. See table E-IX of MIL-PRF-19500.
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