I'm trying to find a replacement for a 2SK2131 MOSFET. This particular MOSFET has been obsolete since 2009. It has a protection diode built in from the Gate to the Source and it doesn't have a metal tab to attach a heat sink to. There are more than a dozen of these on the x-y axis circuit board (at least one of the original MOSFETS is bad). I was told that the IRL640A is a replacement, but the IRL640A has a metal tab that is in common with the Drain. There is a large aluminum heat sink that would make all of the Drains common to each other and this will not work with the existing circuitry. Is there a similar MOSFET that doesn't have the metal tab on it in order to keep all of my drains electrically isolated from each other? Any advice will be greatly appreciated. <SNIP>

 

try IRFP460, fqpf50n06, irfi540npbf

 

STP30NS15LFP is a direct STmicro replacement.

I found this pdf a few months back and it has come in handy.