This part is a kind of semiconductor called S30SC4M.

Function of this product has Schottky Rectifiers (SBD) (40V 30A).

Manufacturers : Shindengen Electric Mfg.Co.Ltd

Image and pinout :

Some of the text within the PDF file :

SHINDENGEN Schottky Rectifiers (SBD) Dual S30SC4M 40V 30A FEATURES •œ Tj150•Ž •œ PRRSM avalanche guaranteed •œ Small ƒÆ jc •œ High current capacity APPLICATION •œ Switching power supply •œ DC/DC converter •œ Home Appliances, Office Equipment •œ Telecommunication OUTLINE DIMENSIONS Case : MTO-3P Unit : mm RATINGS •œAbsolute Maximum Ratings (If not specified Tc=25•Ž) Item Symbol Conditions Ratings Unit Storage Temperature Tstg -40•`150 •Ž Operating Junction Temperature Tj 150 •Ž Maximum Reverse Voltage V RM 40 V Repetitive Peak Surge Reverse V RRSM Pulse Voltage width 0.5ms, duty 1/40 45 V IO 50Hz Average Rectified Forward Current sine wave, R-load, Rating for each 30 diodeA Io/2, Tc= Peak Surge Forward Current IFSM 50Hz sine wave, Non-repetitiv [ ... ]

S30SC4M PDF Datasheet Download