Trying to identify a Motorola part from a grab bag

[Ethan Dicks]

I have a small handful of these parts with a Motorola 'M' on them. 
They are 3-legged, seeming to be a transistor or similar device (I
don't think they are voltage regulators).  The case is plastic,
smaller than a 78M05 (T220?), especially since the metal thermal
transfer patch is integral to the body (not sticking up above the
epoxy like on a 78M05).

The markings are...

R927
S
AC823

I can't seem to find anything reasonable by googling Motorola and
either R927 or AC823.  Does this sound familiar to anyone here?

Thanks,

-ethan