This part is a kind of semiconductor called 1N4097.

Function of this product has 3 WATT ZENER DIODES.

Manufacturers : Digitron Semiconductors

Image and pinout :

Some of the text within the PDF file :

1N5063-1N4097, MZ806-MZ210 High-reliability discrete products and engineering services since 1977 3 WATT ZENER DIODES 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 Rating Operating Temperature Storage Temperature -65 to 175°C -65 to 200°C Value ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified) Electrical Specifications @ 25°C Type (note 1) Nominal Zener Voltage Test Current Maximum Reverse Leakage Current Maximum Zener Impedance VZ @ IZT IZT IR @ VR ± 5% VR ±10% VR ZZ @ IZT ±5% ±10% Tolerance Tolerance Volts mA µA Volts Volts Ohms 1N5063 MZ806 6.8 [ ... ]

1N4097 PDF Datasheet Download