This part is a kind of semiconductor called 1N1202.

Function of this product has SILICON POWER RECTIFIER.

Manufacturers : Digitron Semiconductors

Image and pinout :

Some of the text within the PDF file :

1N1199(A,B)-1N1206(A,B) High-reliability discrete products and engineering services since 1977 SILICON POWER RECTIFIER FEATURES  Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number.  Available as non-RoHS (Sn/Pb plating), standard, and as RoHS by adding “-PBF” suffix. MAXIMUM RATINGS Parameter Symbol Peak reverse voltage Operating & storage temperature range VR TJ, Tstg Maximum thermal resistance RθJC Mounting torque Weight Add “R” to part numbers for reverse polarity. 1N1199 50V 1N1200 100V 1N1201 150V 1N1202 200V 1N1203 300V 1N1204 400V -65 to +200°C 2.5°C/W junction to case 25-30 inch pounds .16 ounces (5.0 grams) typical 1N1205 500V 1N1206 600V ELECTRICAL CHARACTERISTICS (TA = [ ... ]

1N1202 PDF Datasheet Download