MIL-PRF-19500/590K
4.5.4 Scope display evaluation. Scope display evaluation shall be 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 scope. Reverse
current (IBR) over the knee shall be 500 µA peak.
4.5.5 Reverse recovery time.
* 4.5.5.1 Low current reverse recovery time (see figure 5). The low current reverse recovery time shall be 0.5 A
forward current to 1.0 A reverse current in the circuit of figure 5 or equivalent. The reverse recovery time is defined
as the time the rectifier begins to conduct in the reverse direction (crosses I = 0) until the reverse current decays to -
0.25 A. The point of contact on the leads shall be no less than .375 inch (9.52 mm) from the diode body.
4.5.5.2 High current reverse recovery time. The high current reverse recovery time shall be measured in the
circuit of figure 6 or equivalent. A pulse of forward current for the DUT is provided through S1 and controlled by V3,
RL1 and the timing input pulse V1. The duration of pulse, t1, should be sufficient to fully establish the stored charge
associated with the specified IF; it is suggested to be between 10 and 30 microseconds. The reverse voltage (V4) to
the DUT is applied through S2 at a rate determined by the rise time, t2 and magnitude of the input pulse, V2, which is
applied slightly before the end of t1. The negative supply, V4, is to be specified. It should be sufficiently low to prevent
the peak voltage, VRM(REC), from exceeding the rated reverse voltage, VRWM , of the device under test. For most
repeatable measurement, 30 V is recommended. The point of contact on the leads shall be no less than .375 inch
(9.52 mm) from the body.
10
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business