MIL-PRF-19500/118L
4.4.5 Thermal impedance (ZθJX measurements). Thermal impedance measurements shall be in accordance with
method 3101 of MIL-STD-750, and as follows.
a. IH = 500 mA to 1,000 mA.
b. tH = 10 ms.
c. IM = 1 mA to 10 mA.
d. tMD = 70 s maximum.
4.4.6 Thermal resistance. Thermal resistance measurement shall be performed in accordance with method 3101
or 4081 of MIL-STD-750. Read and record data and information shall be included in the qualification report. Forced
moving air or draft shall not be permitted across the devices during test. See 1.3 for maximum limits. The following
conditions shall apply:
a. IH = 75 mA to 300 mA.
b. tH = 25 seconds minimum.
c. IM = 1 mA to 10 mA.
d. tMD = 70 s maximum.
LS = lead spacing = .375 inch (9.53 mm) as defined on figure 5.
LS = 0 for 'UR' and "US" versions.
4.5 Methods of inspection. Methods of inspection shall be as specified in the appropriate tables and as follows.
4.5.1 Free air power burn-in and life tests. The use of a current limiting or ballast resistor is permitted provided
that each device under test is still subject to the full Pt (minimum) 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.
4.5.2 Pulse measurements. Conditions for pulse measurements shall be as specified in section 4 of
MIL-STD-750.
9
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business