This part is a kind of semiconductor called 1N4712.

Function of this product has 500 mW AXIAL-LEADED ZENER DIODES.

Manufacturers : Microsemi Corporation

Image and pinout :

Some of the text within the PDF file :

WWW.Microsemi .COM SCOTTSDALE DIVISION 1N4678 thru 1N4717-1 DO-7 500 mW AXIAL-LEADED ZENER DIODES DESCRIPTION The 1N4678 thru 1N4717 series of 0.5 watt Zener Voltage Regulators provides a selection from 1.8 to 43 volts in standard 5% tolerances as well as tighter tolerances identified by different suffix letters on the part number. These glass axial-leaded DO-7 Zeners also have an internal-metallurgicalbond similar to other military requirements for these packages. Microsemi also offers numerous other Zener products to meet higher and lower power applications. APPEARANCE DO-7 (DO-204AA) IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com FEATURES • JEDEC registered 1N4678 thru 1N4717 • Internally solder bonded • Options for screening in [ ... ]

1N4712 PDF Datasheet Download