27
• MOSFETs with large forward voltage protec-
tion diodes usually register as IGBTs.
• If a MOSFET has a protection diode with a
forward voltage that exceeds the tester’s test
voltages, the tester might show that the
MOSFET is bad.
IGBTs
The tester might incorrectly identify the collector
and emitter of an IGBT. If the tester is successful
in identifying the correct pin configuration, it will
show the pinout as it would for a MOSFET. If no pi-
nout is detected, the IGBT registers as a bad
MOSFET.
Note:
The tester cannot distinguish MOSFETs
from IGBTs with built-in protection diodes.
22-330.fm Page 27 Friday, August 6, 1999 12:34 PM
To Next Page
Loading...