This part is a kind of semiconductor called K3089.

Function of this product has 2SK3089.

Manufacturers : Toshiba

Image and pinout :

Some of the text within the PDF file :

2SK3089 TOSHIBA Field Effect Transistor Silicon N Channel MOS Type (π−MOSVI) 2SK3089 Chopper Regulator DC−DC Converter, and Motor Drive Applications Unit: mm z Low drain−source ON resistance : RDS (ON) = 25 mΩ (typ.) z High forward transfer admittance : |Yfs| = 20 S (typ.) z Low leakage current : IDSS = 100 μA (max) (VDS = 30 V) z Enhancement mode : Vth = 1.5~3.0 V (VDS = 10 V, ID = 1 mA) Absolute Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Drain−source voltage Drain−gate voltage (RGS = 20 kΩ) Gate−source voltage Drain current DC (Note 1) Pulse (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 V [ ... ]

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