Design & Reliability
How to Check a MOSFET on a Motherboard
Check a motherboard MOSFET safely with the board unpowered, a verified pinout, and diode-mode measurements across drain, source, and gate. Learn how to interpret in-circuit…
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Thermal, avalanche, qualification and lifetime engineering practices.
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Design & Reliability
How to Calculate Heat Sink Size for a MOSFET
Calculate the required MOSFET heatsink thermal resistance from power loss, maximum ambient temperature, target junction temperature, package resistance, and interface resistance, then validate the result…
Design & Reliability
Do MOSFETs Get Hot? Causes, Limits, and Cooling
MOSFETs normally produce heat from conduction and switching losses. Learn how to estimate junction temperature, recognize abnormal heating, and improve gate drive, layout, and cooling.
Design & Reliability
How to Check a MOSFET: A Practical Fault-Finding Guide
Use a structured workflow to check a MOSFET for shorts, gate damage, drive faults, abnormal waveforms, and thermal problems in or out of circuit.
Design & Reliability
How to Test a MOSFET With a Multimeter Step by Step
Test N-channel and P-channel MOSFETs with a digital multimeter by checking gate insulation, body-diode direction, shorts, and gate-controlled conduction.
Design & Reliability
How to Test a MOSFET: Multimeter and Circuit Methods
Learn how to test an N-channel or P-channel MOSFET for shorts, body-diode behavior, gate control, leakage, and switching faults using safe multimeter and powered methods.
Design & Reliability
Single-Pulse vs Repetitive Avalanche: What MOSFET Ratings Mean
Why a MOSFET that survives one unclamped inductive event may still need substantial derating for repetitive avalanche operation.
Design & Reliability
Designing the PCB Thermal Path for Power MOSFETs
Turn package loss into a realistic junction-temperature estimate by designing and validating copper spreading, vias, interfaces, and airflow together.