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Old Jan 26, 2014, 02:00 PM
Dave the Rave
dmccormick001's Avatar
Joined Jun 2007
875 Posts
Outboard Pass Transistor

I need to increase the current output of an LM338T Voltage regulator. I've found some circuits that suggest an "outboard pass transistor", and they look like they will do the job, but they don't list an actual part number for the transistor, just the schematic symbol that shows a PNP transistor.

My question is this, I have some NPD6020P transistors availible, would they work OK in this application? They are logic-level MOSFETs, here's the data sheet , but I don't know enough theory to know if they would be suitable. Or would I be better off with something else?

Thanks for any help, guys!
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Old Jan 26, 2014, 02:59 PM
Registered User
Joensuu, Finland
Joined Mar 2002
1,477 Posts
Nope, FET doesn't work, it needs to be bipolar. Just about any power PNP will do.
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Old Jan 29, 2014, 08:24 AM
Acetronics's Avatar
Le Treport, France
Joined Jun 2004
1,408 Posts
try a MJ 4502 ... or TIP 36 or BD 250

that should do it ...

or also use 2 or 3 338 in // ( see 338 or 350 datasheet for the balancing circuit )

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