How can I test a MOSFET for Forward Gate Body Leakage Current on my curve tracer?

Question:

How can I test a MOSFET for Forward Gate Body Leakage Current on my curve tracer?

Answer:

Zero Gate Voltage Drain Current - IDSS

 

What It Is:

Zero gate voltage drain current is the ID that flows when VGS=0.  It’s the on-state current in a depletion mode MOSFET and the off-state current in an enhancement mode MOSFET.

On the curve tracer, the Collector Supply drives the drain and the gate is shorted to the source so that VGS=0.

What The Display Shows:

The display shows VDS on the horizontal axis, and the resulting ID on the vertical axis.  The specification is met when with VGS=0 and the specified VDS applied, ID is less than or equal to the specified maximum.

How To Do It:

1. Set controls:

            A:Max Peak Volts to the lowest setting above the specified VDS

            B: Max Peak Power Watts to the lowest setting that satisfies (ID x VDS)

            C: Horizontal Volts/Div to display VDS between the 5th and 10th horizontal divisions

            D: Vertical Current/Div to display the ID between the 5th and 10thvertical divisions

            E: Collector Supply Polarity to (+DC) for N-channel or (-DC) for P-channel

            F: Configuration to (Base/Short, Emitter/Common)

            G: Variable Collector Supply to minimum % (full ccw)

            H: DotCursor ON

2. Apply power to the MOSFET:

            A: Position the Left/Right switch as appropriate

            B: Slowly increase the Variable Collector Supply % until the specified VDS is reached

3. Compare to data sheet specifications:

            Check that at the specified VDS, ID is less than or equal to the specified maximum

FAQ ID : 53911

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