This part is a kind of semiconductor called 1N5359B.

Function of this product has 5W ZENER DIODE.

Manufacturers : Diodes Incorporated

Image and pinout :

Some of the text within the PDF file :

1N5344B - 1N5388B 5W ZENER DIODE Features · · · · · · Voltage Range 8.2V - 200V Glass Passivated Junction 5W Steady State High Surge Capability ±5% Voltage Tolerance on Nominal VZ is Standard 100% Tested A B A D C Mechanical Data · · · · Case: Molded Plastic Over Glass Passivated Junction Leads: Solderable per MIL-STD-202, Method 208 Polarity: Cathode Band Approx. Weight: 1.2 grams Dim A B C D 5W Min 25.40 8.38 0.94 3.30 Max 8.89 1.09 3.68 All Dimensions in mm Maximum Ratings @ TA = 25°C unless otherwise specified Symbol Value 5.0 20 -55 to +175 Unit W °C/W °C DC Power Dissipation @ TL = 75°C 9.5mm from Body (Board Mounted) Power Derating Above 75°C Lead Temperature Operating and Storage Temperature Range Pd Tj, TSTG Notes: 1. Nominal Zener Voltage (VZ [ ... ]

1N5359B PDF Datasheet Download