This part is a kind of semiconductor called BUZ20.

Function of this product has SIPMOS Power Transistor.

Manufacturers : Infineon Technologies AG

Image and pinout :

Some of the text within the PDF file :

SIPMOS ® Power Transistor BUZ 20 • N channel • Enhancement mode • Avalanche-rated Pin 1 Pin 2 Pin 3 G D S Type VDS ID RDS(on) Package Ordering Code BUZ 20 100 V 13.5 A 0.2 Ω TO-220 AB C67078-S1302-A2 Maximum Ratings Parameter Symbol Values Unit Continuous drain current ID 13.5 A TC = 28 ˚C Pulsed drain current IDpuls 54 TC = 25 ˚C Avalanche current,limited by Tjmax Avalanche energy,periodic limited by Tjmax Avalanche energy, single pulse IAR EAR EAS 13.5 7.9 mJ ID = 13.5 A, VDD = 25 V, RGS = 25 Ω L = 486 µH, Tj = 25 ˚C Gate source voltage Power dissipation 59 VGS Ptot ± 20 75 V W TC = 25 ˚C Operating temperature Storage temperature Thermal resistance, chip case Thermal resistance, chip to ambient DIN humidity category, DIN 40 040 IEC clima [ ... ]

BUZ20 PDF Datasheet Download