This part is a kind of semiconductor called 79L12.

Function of this product has Negative-Voltage Regulators.

Manufacturers : Wing Shing Computer Components

Image and pinout :

Some of the text within the PDF file :

79L12 D D D D D D 3-Terminal Regulators Output Current Up to 100 mA No External Components Required Internal Thermal-Overload Protection Internal Short-Circuit Current Limiting Direct Replacement for Motorola MC79L12 Series Negative-Voltage Regulators OUTPUT INPUT COMMON C I O TO–92 79L12ACZ description This series of fixed negative-voltage integrated-circuit SOT-89 voltage regulators is designed for a wide range of applications. These include on-card regulation for 79L12CPK COMMON INPUT OUTPUT elimination of noise and distribution problems associated with single-point regulation. In addition, they can be used to control series pass elements to make high-current voltage-regulator circuits. One of these regulators can deliver up to 100 mA of output current. The internal current-limit [ ... ]

79L12 PDF Datasheet Download