This part is a kind of semiconductor called DTV1500MF.

Function of this product has CRT HORIZONTAL DEFLECTION HIGH VOLTAGE DAMPER DIODE.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® DTV1500Mxx (CRT HORIZONTAL DEFLECTION) HIGH VOLTAGE DAMPER DIODE MAIN PRODUCTS CHARACTERISTICS IF(AV) VRRM VF (max) trr (max) FEATURES AND BENEFITS s 6A 1500 V 1.65 V 135 ns K A s s s s s s High breakdown voltage capability High frequency operation Specified turn on switching characteristics Very fast recovery diode Low static and peak forward voltage drop for low dissipation Insulated package (ISOWATT220AC, TO-220FPAC): Insulating voltage = 2000V DC Capacitance = 12pF Planar technology allowing high quality and best electrical characteristics A K TO-220FPAC DTV1500MFP A K ISOWATT220AC DTV1500MF DESCRIPTION High voltage diode especially designed for horizontal deflection stage in standard and high resolution displays for TV’s and monitors. This device is packaged in TO [ ... ]

DTV1500MF PDF Datasheet Download