This part is a kind of semiconductor called KA7912A.

Function of this product has 3-Terminal 1A Negative Voltage Regulator.

Manufacturers : Fairchild

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com KA79XX/KA79XXA 3-Terminal 1A Negative Voltage Regulator r Features • • • • • Output Current in Excess of 1A Output Voltages of -5, -6, -8, -9, -10, -12, -15, -18 , -24V Internal Thermal Overload Protection Short Circuit Protection Output Transistor Safe Operating Area Compensation Description The KA79XX/KA79XXA series of three-terminal negative regulators are available in TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shutdown and safe operating area protection, making it essentially indestructible. TO-220 Vin 1 1. GND 2. Input 3. Output Internal Block Digram GND R1 VOLTAGE REFERENCE R2 Out Output + Q1 Q2 PROTECTION CIRCUITRY Rsc I1 I [ ... ]

KA7912A PDF Datasheet Download