This part is a kind of semiconductor called M25JZ51.

Function of this product has SM25JZ51.

Manufacturers : Toshiba Semiconductor

Image and pinout :

Some of the text within the PDF file :

SM25GZ51,SM25JZ51 TOSHIBA BI−DIRECTIONAL TRIODE THYRISTOR ILICON PLANAR TYPE SM25GZ51,SM25JZ51 AC POWER CONTROL APPLICATIONS l Repetitive Peak Off−State Voltage : VDRM = 400, 600V l R.M.S On−State Current l High Commutating (dv / dt) l Isolation Voltage Unit: mm : IT (RMS) = 25A : (dv / dt) c = 10V / µs : VIsol = 1500V AC MAXIMUM RATINGS CHARACTERISTIC Repetitive Peak Off−State Voltage SM25GZ51 SM25JZ51 SYMBOL VDRM IT (RMS) ITSM I t (Note 1) di / dt PGM PG (AV) VGM IGM Tj Tstg VIsol 2 RATING 400 600 25 230 (50Hz) 253 (60Hz) 260 50 5 0.5 10 2 −40~125 −40~125 1500 UNIT V A A A s A / µs W W V A °C °C V 2 R.M.S On−State Current (Full Sine Waveform Tc = 73°C) Peak One Cycle Surge On−State Current (Non-Repetitive) I t Limit Value Critical Rate of R [ ... ]

M25JZ51 PDF Datasheet Download