This part is a kind of semiconductor called LM7809.

Function of this product has 3-TERMINAL 1A POSITIVE VOLTAGE REGULATORS.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

LM78XX (KA78XX, MC78XX) FIXED VOLTAGE REGULATOR (POSITIVE) 3-TERMINAL 1A POSITIVE VOLTAGE REGULATORS The LM78XX series of three-terminal positive regulators are available in the TO-220/D-PAK package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. TO-220 D-PAK FEATURES • • • • • Output Current up to 1A Output Voltages of 5, 6, 8, 9, 10, 11, 12, 15, 18, 24V Thermal Overload Protection [ ... ]

LM7809 PDF Datasheet Download