This part is a kind of semiconductor called BUZ11.

Function of this product has N-Channel Power MOSFET.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

Data Sheet BUZ11 September 2013 File Number 2253.2 N-Channel Power MOSFET 50V, 30A, 40 mΩ This is an N-Channel enhancement mode silicon gate power field effect transistor designed for applications such as switching regulators, switching converters, motor drivers, relay drivers and drivers for high power bipolar switching transistors requiring high speed and low gate drive power. This type can be operated directly from integrated circuits. Formerly developmental type TA9771. Ordering Information PART NUMBER PACKAGE BRAND BUZ11_NR4941 TO-220AB BUZ11 NOTE: When ordering, use the entire part number. Features • 30A, 50V • rDS(ON) = 0.040Ω • SOA is Power Dissipation Limited • Nanosecond Switching Speeds • Linear Transfer Characteristics • High Input Impedance • Majo [ ... ]

BUZ11 PDF Datasheet Download