M51976FP pinout?

Tony Duell ard at p850ug1.demon.co.uk
Tue Aug 10 14:26:16 CDT 2010

> Tony,
> This part is a bitch to find. I had the same results as you with the
> exception of the following;

I never found anything more on it either...

> Abstract: .. The M51996A is equivalent to the M51976 with externally
> resettable OVP overvoltage protection circuit.

Equivalent does not, alas, mean the smae pinout (as I disconvered when 
looking at some ancient dual tracking regulator ICs recently. 
> Not much help but it is a start.
> Best regards, Steven
> On 5/29/10, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
> >
> > I am looking for a pinout or datasheet for a chip labelled M51976FP. It
> > appears to be made by Mitsubishi, it's a SMPSU controller in a 20 pin
> > SOIC package.
> >
> > I have the data on the M51977, which is similar (I think), but some pins
> > are clearly different.

I think in the end I found that hte 51977 was a lot closer than I first 
thought. I'd mis-traced a coupld of pins (using multimeter probles on 
SOIC pacakges is not easy...)

I figured out enough to know that IC was not the problem anyhow...


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