JFET Calculator

Calculate JFET drain current, transconductance, and other parameters with this free online calculator.

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About This Tool

This JFET Calculator helps electronics engineers, students, and hobbyists compute key JFET parameters including drain current (Id), transconductance (gm), and more. Simply input the gate-source voltage (Vgs), drain-source saturation current (Idss), and pinch-off voltage (Vp) to get accurate calculations. The tool supports both n-channel and p-channel JFETs and provides detailed results with formulas used.

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How to Use

Enter the gate-source voltage (Vgs) in volts
Enter the drain-source saturation current (Idss) in milliamps
Enter the pinch-off voltage (Vp) in volts
Select the calculation type (Drain Current or Transconductance)
Click 'Calculate' to see results
Use 'Reset' to clear all inputs

Frequently Asked Questions

Find Quick Answers

What is a JFET?

A Junction Field-Effect Transistor (JFET) is a three-terminal semiconductor device used for amplification and switching. It operates by controlling current flow through a channel using an electric field.

What do Vgs, Idss, and Vp mean?

Vgs is gate-source voltage, Idss is drain-source saturation current (maximum current when Vgs=0), and Vp is pinch-off voltage (voltage where channel closes).

Can this calculator handle both n-channel and p-channel JFETs?

Yes, the calculator works for both types. For p-channel JFETs, enter Vgs and Vp as positive values (the tool handles the sign internally).

What formulas are used in the calculations?

Drain current: Id = Idss * (1 - Vgs/Vp)² Transconductance: gm = (2*Idss/|Vp|) * (1 - Vgs/Vp) These are standard JFET equations for the saturation region.

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