This part is a kind of semiconductor called YG339D6.

Function of this product has FAST RECOVERY DIODE.

Manufacturers : Fuji Semiconductors

Image and pinout :

Some of the text within the PDF file :

YG339C6,N6,D6 (5A) FAST RECOVERY DIODE (600V / 5A) Outline drawings, mm 10±0.5 +0.2 ø3.2 -0.1 4.5±0.2 2.7±0.2 2.7±0.2 15±0.3 6.3 1.2±0.2 13Min 3.7±0.2 Features Insulated package by fully molding High voltage by mesa design High reliability Applications High speed switching Maximum ratings and characteristics Absolute maximum ratings 0.7±0.2 2.54±0.2 +0.2 0.6 -0 2.7±0.2 JEDEC EIAJ SC-67 Connection diagram YG339C6 1 2 YG339N6 1 2 YG339D6 1 2 3 3 3 Item Repetitive peak reverse voltage Symbol VRRM Conditions Rating 600 Unit V Non-repetitive peak reverse voltage VRSM 600 V Isolating voltage Viso Terminals-to-Case, AC.1min 1500 V Average output current Surge current IO Square wave, duty=1/2, Tc=110°C IFSM Sine wave 10ms 5* 20 A A Operating jun [ ... ]

YG339D6 PDF Datasheet Download