FET Derating Curve

FET Design, Thermal Considerations

2N6758 FET [TO-204AA package]
IRF230; 200V Single N-Channel Hi-Rel MOSFET in a TO-204AA package

2N6758 FET Maximum Case Temperature Vs Drain Current Derating Graph
2N6758 Maximum Drain Current vs Case Temperature

Use the graph to determine how to derate a 2N6758 based on Drain current and maximum case temperature. The chart is based on still air [free air]. With out forced air cooling the maximum drain current for the 2N6758 is 9 amps at 250C. Decrease the maximum drain current with increasing temperature as depicted in the chart. Never exceed a junction temperature of 150C or damage will result. Consult a data sheet for additional specifications.

2N6758 Maximum Ratings
Voltage Gate to Source = 20 volts dc
Voltage Drain to Source = 200 volts dc
Voltage Drain to Gate = 200 volts dc
Junction Temperature = -55 to +150oC

MIL-PRF-19500/542; Semiconductor Device, Transistor, Field Effect, N-Channel:
JAN qualified types 2N6756, 2N6758, 2N6760, and 2N6762.
The 2N6758 Field Effect Transistor is available in the TO-204AAAA package, which was previously designated as a TO-3.

FET Derating Compensation, Transistor Derating Guidelines

TO-204 Case mount. The 2N6758 uses a diamond shape flange to achieve thermal management of the case temperature, by providing a large metal surface to act as either a dissipator of heat or as an attachment point to a larger heat sink. The Drain is electrically connected to the case.

Compensating for case temperature; Electronic Component Derating

2N6758 TO-204 Package Drawing
TO-204 Case Diagram

Manufacturers & Vendors:
FET Manufacturers
Thermal Test Chambers
Thermal Imager Manufacturers
Thermal Sensor Manufacturers

Temperature Derating increases MTBF
Failure rates decrease with temperature.
Reliability decreases with temperature.
The chart represents Thermal design

These components are still in production.

PC motherboard

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Modified 12/31/11
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