This part is a kind of semiconductor called 1N5987.

Function of this product has Axial-Leaded 500 mW Zener Diodes.

Manufacturers : Microsemi

Image and pinout :

Some of the text within the PDF file :

WWW.Microsemi .COM SCOTTSDALE DIVISION 1N5985 thru 1N6031-1, e3 DO-35 Axial-Leaded 500 mW Zener Diodes DESCRIPTION The popular 1N5985 thru 1N6031 series of 0.5 watt Zener Voltage Regulators provides a selection from 2.4 to 200 volts in standard 5% or 10% tolerances as well as tighter tolerances identified by different suffix letters on the part number. These glass axial-leaded DO-35 Zeners are also available in various military screening levels by adding a prefix identifier as described in the Features section. Microsemi also offers numerous other Zener products to meet higher and lower power applications. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com APPEARANCE DO-35 (DO-204AH) FEATURES • JEDEC registered 1N5985 to 1N6031 • Similar [ ... ]

1N5987 PDF Datasheet Download