MIL-PRF-19500/567E
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 measurements shall be as specified in section 4 of
4.5.2 Peak reverse energy test. The peak reverse energy test is to be performed as shown on figure 4 or
equivalent. The diode under test must be capable of absorbing the reverse energy, as defined, and meet the
electrical requirements of table I, subgroup 4 herein.
4.5.3 Thermal resistance. Thermal resistance shall be measured in accordance with method 4081 of
MIL-STD-750. The case reference temperature shall be held to equilibrium within the range of +20°C to +70°C
during the power application, and shall be measured at the hottest part of the case. The following measurements
shall apply: IF1 = 1 A, at 97 percent minimum duty factor; IF2 = 10 mA dc.
4.5.4 Reverse current at peak reverse voltage, alternate test. The reverse current at peak reverse voltage test
may be satisfied by performing the reverse energy test of 4.5.2 and measuring breakdown voltage to ensure V(BR) ≥
4.5.5 Scope display evaluation. Scope display evaluation shall be sharp and stable in accordance with method
4023 of MIL-STD-750. Scope display evaluation may be performed on ATE (automatic test equipment) for screening
only with the approval of the qualifying activity. Scope display evaluation in group A shall be performed on an
oscilloscope. One hundred percent scope test is required in the event of a group A failure, however group A
resubmission criteria applies.
4.5.6 Operational power cycling (qualification only). One complete cycle for this test shall consist of the following
two steps: Step 1, heat the case to the Tc(high) specified, by passing forward current through the diode under test.
The reverse voltage shall be only enough to permit the reverse current to flow, and should be a maximum of 5 volts.
Step 2, remove the applied current and allow the case temperature to cool to the TC(LOW) specified. Forward current
shall be chosen to achieve the Tc(high) condition in 75 ±50 seconds. The cycling must be continuous until the
required number of cycles has been completed. It is permissible to force cool the device during step 2.
8
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business