This part is a kind of semiconductor called D1815.

Function of this product has 2SD1815.

Manufacturers : Sanyo

Image and pinout :

Some of the text within the PDF file :

Ordering number:EN2539B PNP/NPN Epitaxial Planar Silicon Transistors 2SB1215/2SD1815 High-Current Switching Applications Applications · Relay drivers, high-speed inverters, converters, and other general high-current switching applications. Features · Low collector-to-emitter saturation voltage. · Excllent linearity of hFE. · Small-sized package permitting 2SB1215/2SD1815- applied sets to be made small and slim. · High fT. · Fast switching time. Package Dimensions unit:mm 2045B [2SB1215/2SD1815] unit:mm 2044B [2SB1215/2SD1815] 1 : Base 2 : Collector 3 : Emitter 4 : Collector SANYO : TP 1 : Base 2 : Collector 3 : Emitter 4 : Collector SANYO : TP-FA Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extre [ ... ]

D1815 PDF Datasheet Download