This part is a kind of semiconductor called ZPY33.

Function of this product has SILICON PLANAR POWER ZENER DIODE.

Manufacturers : Diodes Incorporated

Image and pinout :

Some of the text within the PDF file :

ZPY1 - ZPY100 SILICON PLANAR POWER ZENER DIODE Features · · · · 1.3 W Power Dissipation Reliable Glass Package Planar Die Construction 0.7V - 100V Nominal Zener Voltages Plus ZPY1 Stabistor A B A Mechanical Data · · · · · Case: Glass, DO-41 Leads: Solderable per MIL-STD-202, Method 208 Polarity: Cathode Band Marking: Type Number Weight: 0.35 grams (approx.) DO-41 Dim A B C D Min 25.4 4.1 0.71 2.0 D C Max 5.2 0.86 2.7 All Dimensions in mm Maximum Ratings 25°C unless otherwise specified Symbol Pd RqJA Tj, TSTG Value 1.3 135 -55 to +200 Unit W K/W °C Characteristic Zener Current (see Table on Page 2) Power Dissipation (Note 1) Thermal Resistance, Junction to Ambient Air (Note 1) Operating and Storage Temperature Range Note: 1. Valid provided that leads a [ ... ]

ZPY33 PDF Datasheet Download