This part is a kind of semiconductor called EE13.
Function of this product has Rapid Transformer Sample Service.
Manufacturers : Power Integrations
Image and pinout :
Some of the text within the PDF file :
Rapid Transformer Sample Service EE13(H), 8 pin Bobbin Mechanical Drawing 15.2 max 18.5 max 4.7 max 1 2 3 4 0.5 sq 15 max 4 5 PCB Layout 8 7 6 5 12.5 1 2 3 4 3.81 TOP VIEW UNIT:mm [ ... ]