DaveC schrieb:
3-terminal (well 4, including the tab) SOT-89/TO-243 (4.5 x 2.5 mm) package.

Marked:
2108A
2216/36

Thanks.

Well, €œBJT€� may be a misnomer. Dont know what it is...

Probably.

Maybe it's a MicrOne ME2108A - a switching regulator.
PDFs may be available only with chinese (or the like) text...

Tilmann

P.S. Google for SOT89 2108A to get some results...