This part is a kind of semiconductor called F25JZ51.

Function of this product has SF25JZ51.

Manufacturers : Toshiba

Image and pinout :

Some of the text within the PDF file :

SF25GZ51,SF25JZ51 TOSHIBA THYRISTOR SILICON PLANAR TYPE SF25GZ51,SF25JZ51 MEDIUM POWER CONTROL APPLICATIONS l Repetitive Peak Off−State Voltage : VDRM = 400, 600 V Repetitive Peak Reverse Voltage : VRRM = 400, 600 V l Average On−State Current l Isolation Voltage : IT (AV) = 25 A : VIsol = 1500 V AC Unit in mm MAXIMUM RATINGS CHARACTERISTIC Repetitive Peak Off−State Voltage and Repetitive Peak Reverse Voltage Non−Repetitive Peak Reverse Voltage (Non−Repetitive < 5 ms, 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 Critical Rate of Rise of On−State Current (Note) Peak Gate Power Dissipation Average Gate Power Dissipation Peak Forward Gate Voltage Peak Reverse Gate [ ... ]

F25JZ51 PDF Datasheet Download