This part is a kind of semiconductor called 1N4148-1.
Function of this product has Glass Axial Switching Diode.
Manufacturers : Microsemi
Image and pinout :
Some of the text within the PDF file :
1N4148-1 Available on commercial versions Glass Axial Switching Diode Qualified per MIL-PRF-19500/116 DESCRIPTION This popular 1N4148-1 JEDEC registered switching/signal diode features internal metallurgical bonded construction for military grade products per MIL-PRF-19500/116. This small low capacitance diode, with very fast switching speeds, is hermetically sealed and bonded into a double-plug DO-35 package. It may be used in a variety of very high speed applications including switchers, detectors, transient OR'ing, logic arrays, blocking, as well as low-capacitance steering diodes, etc. Microsemi also offers a variety of other switching/signal diodes. Qualified Levels: JAN, JANTX, and JANTXV Important: For the latest information, visit our website http://www.microsemi.com. FEATURE [ ... ]