2N6546T3 Temperature-Power Derating Curve
NPN Medium Power Transistor. Package, TO-257, [TO-3, TO-254].
2N6546T3 Applications; Suited for 115 and 220 volt line operated
Switching regulators, PWM inverters, Motor controls, Solenoid, relay drivers, and
Deflection circuits
2N6546T3 Derating Curve
The chart indicates the maximum power dissipation with increasing case temperature. Maximum operational power dissipation is achievable at 250C. However above 25C the maximum package dissipation, or power, must be reduce to insure that the devices junction temperature remains constant.
The higher the ambient temperature is increased the lower the allowable power dissipation, as depicted in the curves. Derating is the method of decreasing a devices operational limits as temperature is increased, in this case derating a devices operational power dissipation vs increasing case temperature.
This particular graph depicts the derating of a 2N6546T3 transistor in a TO-257 package. The graph relates to free-air, use forced air cooling to increase the power dissipation of the 2N6546T2. Attach a heat sink to the tab of the 2N6546T3 to dissipate more heat.
Additional Transistor Derating Curves, a common design practice for electrical engineers.
Refer to MIL-PRF-19500/525D; Semiconductor Device, Transistor, NPN, Silicon, Power, Type 2N6546, 2N6546T1, 2N6546T3, 2N6547, 2N6547T1, AND 2N6547T3 JAN, JANTX, AND JANTXV, [TO-257]
2N6546T3 Maximum Operation Ratings:
Collector Emitter Voltage VCEO = 300 volts dc [2N6546T3]
Collector Emitter Voltage VCEO = 400 volts dc [2N6547T3]
Emitter Base Voltage VEBO = 8.0 volts dc
Base Current IB = 10.0 amps dc
Collector Current IC = 15.0 amps dc
Power Dissipation 250C = 125 Watts
Operating Temperature = -65 to +2000C
Storage Temperature = -65 to +2000C
Device Pinout; Terminal 1; Emitter, Terminal 2; Base, Terminal 3; Collector.
Attach a Heat Sink to the components tab for higher temperature operation.
Otherwise follow the recommendations in the curve or consult the data sheet.
