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MOSFET Conduction Loss Calculator

Use MOSFET Conduction Loss to the conduction loss calculation. The loaded example shows the arithmetic with practical electrical units.

Enter values for conduction loss

Use one consistent electrical operating case for all fields.

A

Enter drain current in A.

Ω

Enter on resistance in Ω.

How MOSFET Conduction Loss works

The numerical relationship is P = I²RDS(on). MOSFET Conduction Loss uses Drain current, On resistance to report Conduction loss. Use BJT Bias Calculator as the follow-up for base current.

With the loaded values, conduction loss evaluates to 4.05 W. Isolate a single uncertain input during sensitivity checks.

Inputs for MOSFET Conduction Loss

Drain current and On resistance belong to MOSFET Conduction Loss. Keep source units with drain current.

Replace every example value with data from one documented operating condition.

Drain current
Example entry: 15 A.
On resistance
Example entry: 0.018 Ω.

Reading the MOSFET Conduction Loss result

This output represents MOSFET Conduction Loss.

The worksheet isolates arithmetic; final ratings need a broader equipment check.

Measurement and units

Use component tolerances, voltage ratings, current limits, frequency behavior, and thermal data from the selected parts. Check prefixes on drain current.

Matching units and measurement locations prevent false differences.

Limits of this calculation

Use on-resistance at the expected junction temperature. For stored magnetic energy, use Inductor Energy Calculator.

The displayed formula isolates the stated electrical quantity. Unentered effects remain outside MOSFET Conduction Loss.

MOSFET Conduction Loss record notes

Record source and operating details for drain current. Remaining voltage belongs in the separate Capacitor Discharging worksheet.

Retain raw conduction loss beside its selected rating.

Questions about MOSFET Conduction Loss

What does MOSFET Conduction Loss calculate?

MOSFET Conduction Loss reports conduction loss.

Can Drain current be zero?

For MOSFET Conduction Loss, measure any zero drain current directly.

Why can conduction loss differ from measurement?

Use on-resistance at the expected junction temperature. Recheck drain current.