This part is a kind of semiconductor called 1N5227.

Function of this product has 500 mW Zener Diode 2.4 to 200 Volts.

Manufacturers : Micro Commercial Components

Image and pinout :

Some of the text within the PDF file :

MCC Features
  omponents 21201 Itasca Street Chatsworth    !"# $ %    !"# 1N5221 THRU 1N5281 500 mW Zener Diode 2.4 to 200 Volts DO-35 • • • Wide Voltage Range Available Glass Package High Temp Soldering: 250°C for 10 Seconds At Terminals • • • • • Maximum Ratings Operating Temperature: -55°C to +150°C Storage Temperature: -55°C to +150°C 500 mWatt DC Power Dissipation Power Derating: 4.0mW/°C above 50°C Forward Voltage @ 200mA: 1.1 Volts Figure 1 - Typical Capacitance 100 D A Cathode Mark pf 10 At zero volts At –2 Volts V R D B 1 0 100 VZ Typical Capacitance (pf) – versus – Zener voltage (VZ) Figure 2 - Derating Curve 200 C 400 DIMENSIONS mW 200 DIM A B C D INCHES MIN --1.000 MAX .166 [ ... ]

1N5227 PDF Datasheet Download