This part is a kind of semiconductor called SFH6156-3.

Function of this product has Optocouplers.

Manufacturers : Infineon Technologies AG

Image and pinout :

Some of the text within the PDF file :

5.3 kV TRIOS High Reliability Optocouplers SFH6106 SFH6156 SFH6186 SFH6206 SFH6286  FEATURES • SMD Versions of SFH610, 615, 618, 620, 628 • Available on Tape and Reel To Order Use Suffix “T” • Field Effect Stable by TRIOS (TRansparent IOn Shield) V • VDE 0884 Available with Option 1 • U.L. Approval, File #E52744 D E Package Dimensions in Inches (mm) pin one ID .255 (6.48) .268 (6.81) 3 4 DESCRIPTION The SFH6106, 6116, 6156, 6186, 6206, 6286 families of optocouplers are lead bent for SMD applications. They are electrically equivalent to the SFH610, 615, 618, 620, and 628 families of optocouplers. CROSS REFERENCE SMD SFH6106-1 SFH6106-2 SFH6106-3 SFH6106-4 SFH6156-1 SFH6156-2 SFH6156-3 SFH6156-4 SFH6186-2 SFH6186-3 SFH6186-4 SFH6186-5 SFH6206-1 SFH6206-2 SFH6206-3 [ ... ]

SFH6156-3 PDF Datasheet Download