This part is a kind of semiconductor called LM7909CT.
Function of this product has 3-Terminal 1A Negative Voltage Regulator.
Manufacturers : Fairchild Semiconductor
Image and pinout :
Some of the text within the PDF file :
KA79XX / KA79XXA / LM79XX 3-Terminal 1 A Negative Voltage Regulator KA79XX / KA79XXA / LM79XX 3-Terminal 1 A Negative Voltage Regulator September 2014 Features • Output Current in Excess of 1 A • Output Voltages of: -5 V, -6 V, -8 V, -9 V, -12 V, -15 V, -18 V, -24 V • Internal Thermal Overload Protection • Short-Circuit Protection • Output Transistor Safe Operating Area Compensation Description The KA79XX / KA79XXA / LM79XX series of three-terminal negative regulators are available in a TO-220 package 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. TO-220 Input Ordering Information Product Number KA7905TU KA7906TU KA7908TU KA7909TU [ ... ]