This part is a kind of semiconductor called MA4820.

Function of this product has Power Switching Regulators.

Manufacturers : Shindengen Electric Mfg.Co.Ltd

Image and pinout :

Some of the text within the PDF file :

SHINDENGEN Power Switching Regulators MA4000 Series MA4820 OUTLINE DIMENSIONS Case : MA7 Unit : mm RATINGS ●Absolute Maximum Ratings Item Storage Temperature Operating Temperature Junction Temperature Peak Input Voltage Input Current Maximum Power Dissipation Dielectric Strength Insulation Resistance Max Voltage ④ to ⑥ Max Current ⑥ to ④ Reverse Current Symbol Tstg Top Tj Vin Iin PD PD Vdis V④・⑥ I⑥・④ IZ Conditions ②+,③-,⑤DC ②+,③Pulse ②+,③- Duty1/2 Ta=25℃ Heatsink Tc=100℃ Terminals To Case AC 1 min Terminals To Case 500VDC ④+,⑥⑥+,④-　　（Peak）Duty Max 1/2 ⑤+,④- Ratings -30～125 -20～125 150 800 5 10 3 21 2 100 6 200 MAX 20 Unit ℃ ℃ ℃ V A A W W kV MΩ V mA mA ●Electrical Characteristics (Tc=25℃) Item Zero Gate Volt [ ... ]

MA4820 PDF Datasheet Download