This part is a kind of semiconductor called RSN24.

Function of this product has DC to DC Converter.

Manufacturers : SPEC LIN Enterprise

Image and pinout :

Some of the text within the PDF file :

R/S S N 48 --5 / 2 A Part Number SPECLIN Package A:2*1*0.4 B:2*2*0.4 C:1*1*0.4 Load : Io: 0

RSN24 PDF Datasheet Download