This part is a kind of semiconductor called 1N647.

Function of this product has Silicon Switching Diode DO-35 Glass Package.

Manufacturers : Microsemi Corporation

Image and pinout :

Some of the text within the PDF file :

Silicon Rectifier Diodes Use Advantages 1N645 to 649 or 1N645-1 to 649-1 DO-35 Glass Package Used as a general purpose rectifier in power supplies, or for clipping and steering applications. High performance alternative to small signal diodes where space does not permit use of power rectifiers. May be used in hostile environments where hermeticity and reliability are important i.e. (Military and Aero/Space). MIL-S- 19500/ 240 approvals. Available up to JANTXV-1 level. "S" level screening capability to Source Control Drawings. Features D O -3 5 G la ss P a ck a g e Six Sigma quality Lead Dia. 0.018-0.022" Humidity proof glass 0.458-0.558 mm Metallurgically bonded Thermally matched system D ia . 1 .0 " L e n g th No thermal fatigue 2 5 .4 m m mm (M in .) 1.53-2.28 mm High surge capabi [ ... ]

1N647 PDF Datasheet Download