This part is a kind of semiconductor called 3P4M.

Function of this product has Thyristors.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc Thyristors APPLICATIONS ·Motor speed control for household appliance. ·Temperature control for heater and constant temperature box. ·Constant voltage power source and battery charger. ·Automotive application such as regulator. ·Various solid state relay etc. isc Product Specification 3P4M ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VDRM VRRM IT(AV) IT(RMS) ITSM Tj Tstg Repetitive peak off-state voltage Repetitive peak reverse voltage On-state current RMS on-state current Surge non-repetitive on-state current Junction temperature Storage temperature MIN 600 600 3 4 25 125 -40 to + 125 UNIT V V A A A ℃ ℃ ELECTRICAL CHARACTERISTICS (TC=25℃ unless otherwise specified) SYMBOL PARAMETER CONDITIONS IRRM IDRM VTM IGT VGT IH Rth(j-c) Rth(j- [ ... ]

3P4M PDF Datasheet Download