"Jeff Duce" <jefe_de_estado@...> writes:
It uses a p-type mosfet with a zener diode.
I haven't bothered putting polarity protection on my sbitx yet,
but my TeleLaunch rocket launch control system products that run on a
nominal-12V SLA battery use the Infineon IPD068P03L3G which is a
p-channel FET in an TO252 SMT package for reverse polarity protection.
Nearly no drop when things are hooked up correctly since the channel on
resistance is only 7 milliOhms typical. The parts are spec'ed for up to
70A at 30V, but we have a self-resetting 30A circuit breaker upstream of
them. Works great.
73 - Bdale, KB0G
Bdale Garbee