This part is a kind of semiconductor called PFR852.

Function of this product has FAST RECOVERY RECTIFIER DIODE.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® PFR850→856 FAST RECOVERY RECTIFIER DIODE PRELIMINARY DATASHEET LOW FORWARD VOLTAGE DROP HIGH SURGE CURRENT CAPABILITY APPLICATIONS AC-DC POWER SUPPLIES AND CONVERTERS FREE WHEELING DIODES, etc. DESCRIPTION Their high efficiency and high reliability combined with small size and low cost make these fast recovery rectifier diode very attractive components for many demanding applications. ABSOLUTE RATINGS (limiting values) Symbol IFRM IF (AV) IFSM Ptot Tstg Tj TL Parameter Repetive peak forward current Average forward current* Surge non repetitive forward current Power dissipation * Storage and junction temperature range Maximum lead temperature for soldering during 10s at 4mn from case PFR 850 VRRM VRSM Repetitive peak revrse voltage Non repetitive peak reverse voltage 50 75 851 100 1 [ ... ]

PFR852 PDF Datasheet Download