This part is a kind of semiconductor called K15A60U.

Function of this product has TK15A60U.

Manufacturers : Toshiba

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Some of the text within the PDF file :

TK15A60U TOSHIBA Field Effect Transistor Silicon N Channel MOS Type (DTMOS II) TK15A60U Switching Regulator Applications • • • • Low drain-source ON-resistance: RDS (ON) = 0.24 Ω (typ.) High forward transfer admittance: ⎪Yfs⎪ = 8.5 S (typ.) Low leakage current: IDSS = 100 μA (max) (VDS = 600 V) Enhancement mode: Vth = 3.0 to 5.0 V (VDS = 10 V, ID = 1 mA) Unit: mm Absolute Maximum Ratings (Ta = 25°C) Characteristics Drain-source voltage Gate-source voltage Drain current DC Pulse (Note 1) (Note 1) Symbol VDSS VGSS ID IDP PD EAS IAR EAR Tch Tstg Rating 600 ±30 15 30 40 81 15 4 150 -55 to 150 Unit V V A W mJ A mJ °C °C Drain power dissipation (Tc = 25°C) Single pulse avalanche energy (Note 2) Avalanche current Repetitive avalanche energy (Note 3) Channel temperature Stor [ ... ]

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