This part is a kind of semiconductor called DB3.

Function of this product has 150mW Bi-directional Trigger Diodes.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

DB3-DB3TG 150mW Bi-directional Trigger Diodes DB3-DB3TG 150mW Bi-directional Trigger Diodes Features • VBO : 32V Version • Low break-over current • DO-35 package (JEDEC) • Hermetically sealed glass • Compression bonded construction • All external surfaces are corrosion resistant and terminals are readily solderable • RoHS compliant • High reliability glass passivation insuring parameter stability and protection against junction contamination. • Terminal: Pure tin plated, lead free, solderable per MIL-STD-202, Method 208 guaranteed • High temperature soldering guaranteed : 260°C/10 seconds September 2010 DO-35 Color Band Denotes Cathode Absolute Maximum Ratings and Electrical Characteristics Symbol Parameter VBO ±VBO IBO ΔV IB VO PD IFRM Rθja TJ, TSTG Brea [ ... ]

DB3 PDF Datasheet Download