MIL-PRF-19500/358F
4.5.7 Reverse current. The specified reverse voltage shall be applied to the terminals and the reverse current
measured.
* 4.5.8 DC intermittent operation life. A cycle shall consist of an "on" period, when forward current is applied
suddenly, not gradually, to the device for the time necessary to achieve an increase (delta) case temperature of
+85°C +15°C, -5°C followed by an "off" period, when the current is suddenly removed for cooling the case through a
similar delta temperature. Auxiliary (forced) cooling is permitted during the "off" period only. Forward current and
"on" time, within specific limits, and "off" time may be adjusted to achieve the delta case temperature. Heat sinks
shall only be used, if and to the degree necessary, to maintain test samples within the desired delta temperature
tolerance. The heating time shall be such that 30 s < theating < 180 s. The forward current may be steady-state dc,
full-wave rectified dc, or the equivalent half-sine wave dc of the specified value. Alternately, Iz may be used to
achieve heating. The test duration shall be the specified number of cycles. Within the time interval of 50 cycles
before and 500 cycles after the termination of the test, the sample units shall be removed from the specified test
conditions and allowed to reach room ambient conditions. Specified end-point measurements for qualification and
quality conformance inspections shall be completed within 96 hours after removal of sample units from the specified
test conditions. Additional readings may be taken at the discretion of the manufacturer.
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