This post explains for the MOSFET.

The Part Number is K3451, 2SK3451.

The function of this transistor is 600V, 13A, N-Channel MOSFET.

The package is TO-220 Type

Manufacturer: Fuji Electric

Preview images :

Pinout: 1. Gate 2. Drain 3. Source

Description

Features :

1. High speed switching

2. Low on-resistance

3. No secondary breadown

4. Low driving power

5. Avalanche-proof

Maximum ratings :

1. Drain-source voltage : VDS = 600 V

2. Continuous drain current : ID = ±13 A

3. Pulsed drain current : ID(puls] = ±52 A

4. Gate-source voltage : VGS = ±30 V

5. Repetitive or non-repetitive : IAR *2 = 13 A

6. Maximum Avalanche Energy : EAS *1 = 216.7 mJ

Applications:

1. Switching regulators

2. UPS (Uninterruptible Power Supply)

3. DC-DC converters

K3451 PDF Datasheet

This post explains for the MOSFET.

The Part Number is K11A60D, TK11A60D.

The function of this semiconductor is 600V, 11A, MOSFET.

The package is TO-220 Type

Manufacturer: Toshiba Semiconductor

Preview images :

 

Description

K11A60D is 600V, 11A, Silicon N-Channel MOSFET.

Features

• Low drain-source ON resistance: RDS (ON) = 0.54 Ω (typ.)

• High forward transfer admittance: ⎪Yfs⎪ = 6.0 S (typ.)

• Low leakage current: IDSS = 10 μA (max) (VDS = 600 V)

• Enhancement-mode: Vth = 2.0 to 4.0 V (VDS = 10 V, ID = 1 mA)

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 = 11 A

4. Drain Power Dissipation: Pd = 45 W

5. Channel temperature: Tch = 150 °C

6. Storage temperature: Tstg = -55 to +150 °C

 

Applications:

1. Switching Regulator

K11A60D PDF Datasheet