MIL-PRF-19500/554E
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 measurements shall be as specified in section 4 of
MIL-STD-750.
4.5.2 Peak reverse energy test. The peak reverse energy test is to be performed as on figure 4. The Schottky
rectifier 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 Scope display evaluation. A curve trace visual display of the reverse characteristics (voltage versus current)
shall be made using a calibration of 10 mA per division vertical sensitivity, and 10 V dc per division horizontal
sensitivity. Increase the reverse voltage until the reverse current reaches 50 mA minimum to 70 mA maximum.
Observe the curve characteristics. Any device with an erratic pattern, such as double trace, other than capacitance
effects, intermittence, discontinuities other than zener noise at the knee of the curve, or shorts shall be removed from
the lot. Time limit for this test shall be 5 seconds minimum. This test shall be the last test performed on the device in
the 100 percent screening tests. The percent defective result for evaluation against the percent defective allowed
(PDA) shall be determined prior to the results of this test.
4.5.4 Reverse current at peak reverse voltage, alternate test. The reverse current at peak reverse voltage test
requirement may be satisfied by performing the reverse energy test of 4.5.2 and measuring breakdown voltage to
ensure VBR ≥ 54 V (pk) with IRM = 2.0 A (pk).
* 4.5.5 DC intermittent operation life. Method 1037 of MIL-STD-750. 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 the specified forward current
through the diode under test. The reverse voltage shall be only enough to permit the reverse current to flow, and in
any event should be a maximum of 5 V dc. Step 2, remove the applied current and allow the case temperature to
cool to the TC (low) specified. No time limit is applicable to the steps, but 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.
This test shall be considered a qualification test only, and needs to be performed during the initial qualification and as
applicable to verify the adequacy of a design change.
4.5.6 Inspection conditions. Unless otherwise specified in MIL-PRF-19500 or herein, all inspections shall be
conducted at a case temperature (TC) of +25°C ± 3°C.
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