MIL-PRF-19500/420M
* 4.4.3 Group C inspection. Group C inspection shall be conducted in accordance with the tests and conditions
specified for subgroup testing in table VII of MIL-PRF-19500. Electrical measurements (end-points) requirements
shall be in accordance with table I, subgroup 2 herein. Delta measurements shall be as specified in table III herein.
* 4.4.3.1 Group C inspection, table VII of MIL-PRF-19500.
Subgroup
Method
Condition
Axial devices - Tension: Test condition A; weight = 20 pounds; t = 15 seconds.
C2
2036
Lead fatigue: Test condition E; weight 2 pounds. (Lead fatigue is not applicable
to US diodes).
C2
2036
US devices Tension: Test condition A; weight = 20 pounds; t = 15 seconds.
Suitable fixtures may be used to pull the end-caps in a manner which does not
aid construction. Reference to axial lead may be interpreted as end-cap with
fixtures used for mounting (see figure 10 herein). (Lead fatigue is not applicable
to US diodes).
RθJL(maximum) < 22°C/W, L = .375 inch (9.53 mm). For surface mount devices
C5
4081
*
C6
1026
an end-point measurement.
* 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. Electrical measurements
(end-points) requirements shall be in accordance with table I, subgroup 2 herein and delta requirements of table III
herein.
4.5 Methods of inspection. Methods of inspection shall be as specified in 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 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.
4.5.2.1 Burn-in and life tests The use of a current limiting or ballast resistor is permitted provided that each DUT
still sees the required TJ and full rated Io and that the minimum required voltage VRWM is maintained throughout the
burn-in period. Use method 3100 of MIL-STD-750 to measure TJ. With the approval of the qualifying activity, the
supplier may apply TJ = 200°C max during burn-in test.
4.5.3 Scope display evaluation. Scope display evaluation shall be sharp and 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 curve tracer. The
reverse current (IBR) over the knee shall be 500 µA peak.
4.5.4 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 =
14
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