This part is a kind of semiconductor called 79L12.

Function of this product has 3-TERMINAL 0.1A NEGATIVE VOLTAGE REGULATOR.

Manufacturers : Unisonic Technologies

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 79LXX LINEAR INTEGRATED CIRCUIT 3-TERMINAL 0.1A NEGATIVE VOLTAGE REGULATOR  DESCRIPTION The UTC 79LXX family is monolithic fixed voltage regulator integrated circuit. They are suitable for applications that required supply current up to 100mA.  FEATURES * Output current up to 100Ma. * Fixed output voltage of -5V, -6V, -8V, -9V, -12V,-15V, -18V and -24V available. * Thermal overload shutdown protection. * Short circuit current limiting.  ORDERING INFORMATION Ordering Number Lead Free Halogen Free - 79LXXG-AB3-R - 79LXXG-S08-R 79LXXL-T92-B 79LXXG-T92-B 79LXXL-T92-K 79LXXG-T92-K Notes: 1. XX: Output Voltage, refer to Marking Information 2. Note: Pin Assignment: I:VIN O:VOUT G:GND Package SOT-89 SOP-8 TO-92 TO-92 Pin Assignment 12345678 [ ... ]

79L12 PDF Datasheet Download