This part is a kind of semiconductor called LM7909.

Function of this product has 3 TERMINAL 1A NEGATIVE VOLTAGE REGULATOR.

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD LM79XX LINEAR INTEGRATED CIRCUIT 3 TERMINAL 1A NEGATIVE VOLTAGE REGULATOR  DESCRIPTION The UTC LM79XX series of three-terminal negative regulators is available several fixed output voltage, making them useful in a wide range of application. Each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible.  FEATURES * Output Current Up to 1A *-5V, -6V, -8V, -9V,-12V, -15V, -18V, -24V Output Voltage Available * Thermal Overload Protection  ORDERING INFORMATION Ordering Number Lead Free Halogen Free LM79xxL-TA3-T LM79xxG-TA3-T LM79xxL-TF3-T LM79xxG-TF3-T Note: Pin Assignment: O: Output G: GND I: Input Package TO-220 TO-220F Pin Assignment 123 GIO GIO Packing Tube Tube www.unis [ ... ]

LM7909 PDF Datasheet Download