This part is a kind of semiconductor called 1N4395.
Function of this product has (1N4394 / 1N4395) SILICON TUNNEL DIODE.
Manufacturers : SSDI
Image and pinout :

Some of the text within the PDF file :
SOLID STATE DEVICES, INC. 14830 Valley View Blvd * La Mirada, Ca 90638 Phone: (562) 404-7855 * Fax: (562) 404-1773 ssdi@ssdi-power.com * www.ssdi-power.com 1N4394 and 1N4394A 1N4395 and 1N4395A Designer's Data Sheet FEATURES: • • • • • • • • Hermetically Sealed Axial Lead Package Weldable Gold Plated Kovar Leads Temperature Stability, Uniformity, and Available in 5% ('A') or 10% Tolerance on Peak Point Current Silicon Tunnel Diode Construction Meets Requirements of MIL-PRF-19500 TX, TXV, and Space Level Screening Available Surface Mount Devices Available 1.30 SILICON TUNNEL DIODE DO-17 Maximum Ratings Maximum Forward Current (TC = 25 oC) Derate Above TC = 25 oC Maximum Reverse Current Storage Temperature Maximum Soldering Temperature L = 1/4", t = [ ... ]
1N4395 PDF Datasheet Download
