MIL-PRF-19500/402F
Temperature-Power Derating Curve
TC=25°C 2N3739
25
20
15
10
5
0
25
50
75
100
125
150
175
200
225
DC Operation
Tc (ºC) (Case)
Thermal Resistance Junction to Case = 7.5ºC/W
Note: Max Finish-Alloy Temp = 175.0ºC
NOTES:
1. Maximum theoretical derate design curve. This is the true inverse of the worst case thermal resistance
value. All devices are capable of operating at TJ specified on this curve. Any parallel line to this curve will
intersect the appropriate power for the desired maximum TJ allowed.
2. Derate design curve constrained by the maximum junction temperature (TJ +200C) and power rating
specified. (See 1.3 herein.)
3. Derate design curve chosen at TJ +150C where the maximum temperature of electrical test is performed.
4. Derate design curves chosen at TJ +125C and +110C to show power rating where most users want to
limit TJ in their application.
FIGURE 2. Temperature-power derating graph.
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