MIL-PRF-19500/498E
Temperature-Power Derating Curve
TC=25°C 2N6306T3, 2N6308T3
140
120
100
80
60
40
20
0
25
50
75
100
125
150
175
200
225
DC Operation
Tc (ºC) (Case)
Thermal Resistance Junction to Case = 1.3ºC/W
Note: Max Finish-Alloy Temp = 175.0ºC
NOTES:
1. Top curve is thermal runaway loci and cannot be used as a derate design curve since it exceeds the
maximum ratings for this part. Operating under this curve using these mounting conditions assures the
device will not have a thermal runaway. This is the true inverse of the worst case thermal resistance value
extrapolated out to the thermal runaway point.
2. Derate design curve constrained by the maximum junction temperature (TJ ≤ +200°C) and power rating
specified. (See 1.3 herein.)
3. Derate design curve chosen at TJ ≤ +150°C, where the maximum temperature of electrical test is performed.
4. Derate design curves chosen at TJ ≤ +125°C, and +110°C to show power rating where most users want to
limit TJ in their application.
* FIGURE 6. Temperature-power derating graph (2N6306T3, 2N6308T3, TO-257AA).
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