MIL-PRF-19500/356L
4.5.3 Voltage regulation (VZ(reg)). The breakdown voltage shall be measured at IZ = 10 percent of column 8 of
table IV and at IZ = 50 percent of column 8 of table IV. The difference between these voltages shall then be
determined and shall not exceed column 9 of table IV. The voltage measurement at IZ = 10 percent of column 8 of
table IV shall be a pulse measurement in accordance with 4.5.1. The measurement at IZ = 50 percent of column 8 of
table IV shall be made after current has been applied for 30 ±3 seconds. For this time interval, the device shall be
suspended in free air by its leads with mounting clips with inside edge .375 inch (9.53 mm) from the body, and the
point of connection shall be maintained at a temperature of +25°C, +8°C, -2°C. No forced air across the device shall
be permitted. US suffix devices shall be mounted with the end-caps maintained at +25°C, +8°C, -2°C. For JANHC
and JANKC, the die shall be stabilized at +25°C and the test shall be performed utilizing pulse conditions. The ĆVZ
measurement may be performed after a shorter time interval following application of the test current if correlation can
be established to the satisfaction of the qualifying activity.
4.5.4 Temperature coefficient of regulator voltage (αVZ). The device shall be temperature stabilized with current
applied prior to reading regulator voltage at the specified ambient temperature.
4.5.5 Free-air burn-in. The use of a current limiting or ballast resistors is permitted provided that each DUT still
sees at least the IZ (minimum) described in 4.3.2 and that the minimum applied voltage, where applicable, is
maintained throughout the burn-in period. Use method 3100 of MIL-STD-750 to measure TJ.
4.5.6 Scope display evaluation. Scope display evaluation shall be sharp and stable in accordance with method
4023 of MIL-STD-750. Scope display in table I, subgroup 4 shall be performed on a scope. The reverse current
(IBR) over the knee shall be 500 µA peak.
4.5.6.1 Scope display option. At the suppliers option, 100 percent scope display evaluation may be discontinued
after three consecutive lots are 100 percent tested with zero failures. Any group A failure shall require 100 percent
scope display to be reinvoked.
4.5.7 Surge current (IZSM). The peak currents specified in column 10 of table IV shall be applied in the reverse
direction and shall be superimposed on the current (IZ = column 5 of table IV) a total of five surges at 1 minute
intervals. Each individual surge shall be at one-half square wave pulse of 8.3 millisecond duration or an equivalent
sine wave with the same effective (rms) current.
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