2N6306 Temperature-Power Derating Curve
NPN Power Transistor. Package, TO-3 Metal Can [TO-254AA, TO-257AA].
2N6306 applications; High voltage inverters, Switching regulators, Amplifiers

2N6306 Transistor Temperature-Power Derating Curve
2N6306 Transistor Derating Curve

The above chart details the maximum allowable power dissipation with increasing case [Tc] temperature. Maximum operational power dissipation is achievable at 25C. 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 [or case temperature] is increased the lower the allowable power dissipation, as depicted in the curves. Decreasing a devices operational limits as temperature is increased is called derating, in this case derating a devices operational power dissipation vs increasing case [ambient] temperature. This particular graph depicts the derating of a 2N6306 transistor in a TO-3 package.

Attach a heat sink to increase the device's operating temperature range. Or apply forced air cooling to dissipate the heat, the chart is for still air.

Refer to MIL-PRF-19500/498E; Semiconductor Device, Transistor, NPN, Silicon, Power, Types 2N6306, 2N6306T1, 2N6306T3, 2N6308, 2N6308T1, 2N6308T3, JAN, JANTX, and JANTXV [TO-3, TO-254AA, TO-257AA]

2N6306 Maximum Ratings:
Collector Emitter Voltage = 250 volts
Collector Base Voltage = 500 volts
Emitter Base Voltage = 8.0 volts
Power Dissipation 250C = 5 Watts
Operating Temperature = -65 to +2000C
Storage Temperature = -65 to +2000C


Case mount device. A type of package (outline) which provides a method of readily attaching one surface of the semiconductor device to a heat dissipater to achieve thermal management of the case temperature.

How to Derate; Guideline for Derating Electronic Components

Department of Defense Specifications:
MIL-PRF-19500: Semiconductor Devices, General Specification
MIL-STD-750: Test Methods for Semiconductor Devices

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2N6306 TO-3 Diagram
TO-3 Metal Package

Related Devices of
NPN 2N6306T1 Transistor
NPN 2N6306T3 Transistor

Complete list of
Component Derating Curves
Transistor Derating Curves
Transistor Packages

Complete Listing of
Transistor Manufacturers, BJT vendors.

Engineering Key Words:
Transistor, Component Derating, reliability,
Sizing, Derate, Semiconductor, 2N6306,
Insulation, Rated Temp, Temperature,
Guide, How To, Guideline, Example,
Burn-Out, Design, Failure, MTBF, NPN.

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Last Modified 7/10/09
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