Hi sar001us ,
If it offers any assistance, this is a surface mount TO-243AA package, sometimes known as SOT-89-3, 3-HSIP, PW-MINI, and SC-62. Easily identified by having 3 “flat leads” and a tab. The tab allows heat dissipation to the board.
Clicking above link will provide all the component types within that package DigiKey carries, unfortunately there is no way to search based on part markings other than manually searching within each datasheet. Performing an analysis of the circuit and parts around the component may steer you in the right direction of what kind of component this would be.
Resources:
Common Electronic Component Package Types
PCB Markings: Reference Designator Meanings (Part Identification)