> The black
plastic SOT-23 package is marked with 5A followed by a K
> rotated 90deg counter-clockwise.
This says to me "five-amp rectifier pair", especially if the K is next
Are you suggesting a 5A diode (or diode pair) in an SOT23 package? I
would be _very_ suprised.
More like the '5A' is a code for the diode type. IIRC, every manufacturer
did his own thing with this codes (at least for transistors) which makes
life 'interesting. It could also be a zener of some unknown voltage.
Can you figure out what it's connected to (do any of the connections go
to supply lines or ground, for example). That may give soem clue.
-tony