This part is a kind of semiconductor called MGD622.

Function of this product has IGBT.

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

600 V, 20 A, IGBT with Fast Recovery Diode MGD622 Features  Low Saturation Voltage  High Speed Switching  With Integrated Low VF Fast Recovery Diode  RoHS Compliant  VCE -- 600 V  IC---20 A (TC = 100 °C)  VCE(sat)---2.1 V typ.  tf --- 120 ns typ.  VF1.2 V typ. Package TO3P-3L Applications  Microwave oven  IH cooker  Inverter circuit (1) (2) (3) GCE Equivalent circuit C (2)(4) G (1) E (3) (4) C Not to scale Absolute Maximum Ratings  Unless otherwise specified, TA = 25 °C Parameter Symbol Collector to Emitte [ ... ]

MGD622 PDF Datasheet Download