This part is a kind of semiconductor called BUZ11.

Function of this product has SIPMOS Power Transistorm (N channel Enhancement mode Avalanche-rated).

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

BUZ 11 Not for new design SIPMOS ® Power Transistor • N channel • Enhancement mode • Avalanche-rated Pin 1 G Pin 2 D Pin 3 S Type BUZ 11 VDS 50 V ID 30 A RDS(on) 0.04 Ω Package TO-220 AB Ordering Code C67078-S1301-A2 Maximum Ratings Parameter Continuous drain current Symbol Values 30 Unit A ID IDpuls 120 TC = 29 °C Pulsed drain current TC = 25 °C Avalanche current,limited by Tjmax Avalanche energy,periodic limited by Tjmax Avalanche energy, single pulse IAR EAR EAS 30 1.9 mJ ID = 30 A, VDD = 25 V, RGS = 25 Ω L = 15.6 µH, Tj = 25 °C Gate source voltage Power dissipation 14 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 clim [ ... ]

BUZ11 PDF Datasheet Download