This part is a kind of semiconductor called SS34.

Function of this product has Schottky Barrier Diode.

Manufacturers : WillSEMI

Image and pinout :

Some of the text within the PDF file :

SS34 3A, Schottky Barrier Diode SS34 Http//:www.sh-willsemi.com Features  Schottky barrier rectifier  Guarding protection  Low forward voltage  Reverse energy tested  High current capability  Extremely low thermal resistance  Standard products are Pb-free and Halogen-free SMA (DO-214AC) . SS34= Device code Pin configuration and Marking MECHANICAL DATA  Case: SMA molded plastic body  Polarity: Color band denotes cathode end  Mounting position: ANY Device SS34 Order information Package Shipping SMA (DO-214AC) 5000/Tape&Reel Will Semiconductor Ltd. 1 Feb, 2014 - Rev. 1.0 Absolute maximum ratings Parameter Symbol Maximum Repetitive Peak Reverse Voltage VRRM Maximum RMS voltage VRWS Maximum DC blocking voltage VDC Maximum average forward rectif [ ... ]

SS34 PDF Datasheet Download