This part is a kind of semiconductor called 78T12.

Function of this product has MC78T12.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com MC78TXX 3-Terminal 3A Positive Voltage Regulator Features • • • • • • • • Output Current in Excess of 3.0A Output Transistor Safe Operating Area Compensation Power Dissipation :25W Internal Short Circuit Current Limiting Internal Thermal Overload Protection Output Voltage Offered in 4% Tolerance No External Components Required Output Voltage of 5,12 and 15V Description This family of fixed voltage regulators are monolithic integrated circuit capable of driving loads in excess of 3.0 A. TO-220 GND 1 1.Input 2. GND 3. Output Internal Block Diagram INPUT 1 CURRENT GENERATOR SERIES PASS ELEMENT OUTPUT 3 SOA PROTECTION STARTING CIRCUIT REFERENCE VOLTAGE ERROR AMPLIFIER THERMAL PROTECTION GND 2 Rev. 1.0.1 ©2002 Fairchild [ ... ]

78T12 PDF Datasheet Download