Re: Need help locating Transistor or equiv

On Thu, 22 May 2008 13:41:16 -0700, dplatt@xxxxxxxxxxxx (Dave Platt)
wrote:

In article <4BjZj.5269$mz3.4560@xxxxxxxxxxxxxxxxxxxxxx>,
Gary L. Woodruff <woodruffrepair@xxxxxxxxxxxxxxx> wrote:

Dave, I guess this is where my confusion starts. I see diode E -C
in the http://www.onsemi.com/pub_link/Collateral/MJH11017-D.PDF circuit
diagram. Am I correct that I would NOT need to add a diode to this?

I believe you are correct. This family of Darlingtons does include a
reverse diode, and would not need an external one.

HOWEVER: the MJH11017 is a PNP Darlington! If I recall correctly,
the one you're seeking to replace is an NPN Darlington. Not compatible!

You're right. Boot to the head.

You'd want to use an MJH11018, which is the NPN equivalent of the
MJH11017, to replace an existing NPN part.

MJH11022 is the closest in-stock item on the Digikey site. It shows up
on the same data *** as the 017. Possibly where the mix-up started.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=MJH11022GOS-ND

Sorry about that.

RL
.