This part is a kind of semiconductor called S6785G.

Function of this product has TOSHIBA HIGH SPEED THYRISTOR SILICON PLANAR TYPE.

Manufacturers : Toshiba Semiconductor

Image and pinout :

Some of the text within the PDF file :

S6785G TOSHIBA HIGH SPEED THYRISTOR SILICON PLANAR TYPE S6785G HIGH SPEED SWITCHING AND CONTROL APPLICATIONS Unit: mm MAXIMUM RATINGS CHARACTERISTIC Repetitive Peak Off−State Voltage and Repetitive Peak Reverse Voltage Non−Repetitive Peak Reverse Voltage (Non−Repetitive <5ms, Tj = 0~125°C) Average On−State Current (Half Sine Waveform) R.M.S On−State Current Peak One Cycle Surge On−State Current (Non−Repetitive) I t Limit Value Peak Gate Power Dissipation Average Gate Power Dissipation Peak Forward Gate Voltage Peak Reverse Gate Voltage Peak Forward Gate Current Junction Temperature Storage Temperature Range 2 SYMBOL VDRM VRRM VRSM IT (AV) IT (RMS) ITSM I t PGM PG (AV) VFGM VRGM IGM Tj Tstg 2 RATING 400 UNIT V 500 V 3 4.7 60 (50Hz) 66 (60Hz) 18 5 0.5 10 −6 2 −40~1 [ ... ]

S6785G PDF Datasheet Download