This part is a kind of semiconductor called K3742.

Function of this product has 2SK3742.

Manufacturers : Toshiba Semiconductor

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Some of the text within the PDF file :

2SK3742 TOSHIBA Field Effect Transistor Silicon N-Channel MOS Type (π-MOSIV) 2SK3742 Switching Regulator Applications • Low drain-source ON resistance: RDS (ON) = 2.2 Ω (typ.) • High forward transfer admittance: |Yfs| = 3.5 S (typ.) • Low leakage current: IDSS = 100 μA (VDS = 720 V) • Enhancement model: Vth = 4.0~5.0 V (VDS = 10 V, ID = 1 mA) Unit: mm Absolute Maximum Ratings (Ta = 25°C) Characteristic Symbol Rating Unit Drain-source voltage Drain-gate voltage (RGS = 20 kΩ) Gate-source voltage Drain current DC (Note 1) Pulse (t = 1 ms) (Note 1) Drain power dissipation (Tc = 25°C) Single pulse avalanche energy (Note 2) Avalanche current Repetitive avalanche energy (Note 3) Channel temperature Storage temperature range VDSS VDGR VGSS ID [ ... ]

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