This post explains for the transistor K20A60U.
The Part Number is TK20A60U.
The Making information is K20A60U.
The function of this MOSFET is N-Channel, 600V.
Manufacturers : Toshiba
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Description :
Switching Regulator Applications
• Low drain-source ON-resistance: RDS (ON) = 0.165 Ω (typ.)
• High forward transfer admittance: ⎪Yfs⎪ = 12 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)
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Absolute Maximum Ratings (Ta = 25°C)
1. Drain to source voltage : VDSS = 600 V
2. Gate to source voltage : VGSS = ± 30 V
3. Drain current : ID = 20 A
4. Drain power dissipation : PD = 45 W
5. Single pulse avalanche energy : Eas = 144 mJ
6. Avalanche curren : Iar = 20 A
7. Repetitive avalanche energy : Ear = 4.5 mJ
8. Channel temperature : Tch = 150 °C
9. Storage temperature : Tstg = -55 to +150 °C