This part is a kind of semiconductor called STV8172A.

Function of this product has Vertical Deflection Booster for 3-APPTV/Monitor Applications.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

® STV8172A Vertical Deflection Booster for 3-APPTV/Monitor Applications with 70-V Flyback Generator DATASHEET Main Features ■ Power Amplifier ■ Flyback Generator ■ Stand-by Control ■ Output Current up to 3 App ■ Thermal Protection HEPTAWATT (Plastic Package) ORDER CODE: STV8172A Description The STV8172A is a vertical deflection booster designed for TV and monitor applications. This device, supplied with up to 35 V, provides up to 3 App output current to drive the vertical deflection yoke. The internal flyback generator delivers flyback voltages up to 75 V. In double-supply applications, a stand-by state will be reached by stopping the (+) supply alone. Tab connected to pin 4 7 6 5 4 3 2 1 Input (Non Inverting) Output Stage Supply Output Ground Or Negative Supply Flyback Gene [ ... ]

STV8172A PDF Datasheet Download