This part is a kind of semiconductor called 1N4248.

Function of this product has STANDARD RECOVERY GLASS.

Manufacturers : Microsemi

Image and pinout :

Some of the text within the PDF file :

6 Lake Street, Lawrence, MA 01841 1-800-446-1158 / (978) 620-2600 / Fax: (978) 689-0803 Website: http://www.microsemi.com TECHNICAL DATA SHEET Gort Road Business Park, Ennis, Co. Clare, Ireland Tel: +353 (0) 65 6840044 Fax: +353 (0) 65 6822298 VOIDLESS-HERMETICALLY-SEALED STANDARD RECOVERY GLASS Qualified per MIL-PRF-19500/286 DEVICES 1N4245 thru 1N4249 LEVELS JAN JANTX JANTXV DESCRIPTION This “standard recovery” rectifier diode series is military qualified to MIL-PRF-19500/286 and is ideal for high-reliability applications where a failure cannot be tolerated. These industry-recognized 1.0 Amp rated rectifiers for working peak reverse voltages from 200 to 1000 volts are hermetically sealed with voidless-glass construction using an internal “Category I” metallurgical bond. The [ ... ]

1N4248 PDF Datasheet Download