MIL-PRF-19500/580C
4.5.3 Thermal resistance. Thermal resistance measurements shall be conducted in accordance with method
3131 of MIL-STD-750. Maximum limit of RθJC shall be 29°C/W. The following test conditions shall apply:
a. Heating power shall be chosen such that the calculated junction to reference point temperature difference is
greater than +50°C.
*
b. Collector to emitter voltage magnitude shall be --20 V dc.
c. Reference temperature measuring point shall be the case.
d. Reference point temperature shall be + 25°C ≤ TR ≤ +35°C and recorded before the test is started.
e. Mounting arrangement shall be with heat sink to case.
f. Maximum limit shall be RθJC = 29°C/W.
*
4.5.4 Delta requirements. Delta requirements shall be as specified below:
Step
Inspection
Symbol
Limits
Method
Conditions
Min
Max
ĆICBO
1.
Collector to base cutoff
3036
Bias condition D
100 percent of initial
current
value or
(1)
10 nA dc whichever is
2N4234
greater.
VCB = -40 V dc
2N4235
VCB = -60 V dc
2N4236
VCB = -80 V dc
± 25 percent change
ĆhFE2
2.
Forward current transfer
3076
IC = -250 mA dc
ratio
from initial recorded
(1)
VCE = -1.0 V dc;
value.
pulsed (see 4.5.1)
(1) Devices which exceed the table I limits for this test shall not be shipped.
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