This part is a kind of semiconductor called SETA.

Function of this product has SURFACE MOUNT HIGH EFFICIENT RECTIFIERS.

Manufacturers : EIC discrete

Image and pinout :

Some of the text within the PDF file :

SETA - SETM PRV : 50 - 1000 Volts Io : 2.5 Amperes FEATURES : * * * * * * High current capability High surge current capability High reliability Low reverse current Low forward voltage drop Fast switching for high efficiency SURFACE MOUNT HIGH EFFICIENT RECTIFIERS SMB (DO-214AA) 1.1 ± 0.3 5.4 ± 0.15 4.8 ± 0.15 2.0 ± 0.1 3.6 ± 0.15 2.3 ± 0.2 0.22 ± 0.07 MECHANICAL DATA : * Case : SMB Molded plastic * Epoxy : UL94V-O rate flame retardant * Lead : Lead Formed for Surface Mount * Polarity : Color band denotes cathode end * Mounting position : Any * Weight : 0.1079 gram Dimensions in millimeter Rating at 25 °C ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20%. MAXIMUM RATINGS [ ... ]

SETA PDF Datasheet Download