K14A55D PDF Datasheet – 550V, 14A, N-ch, MOSFET

This post explains for the MOSFET.

The Part Number is K14A55D, TK14A55D.

The function of this semiconductor is 550V, N-channel MOSFET.

The package is TO-220 Type

Manufacturer: Toshiba

Preview images :K14A55D pdf pinout


K14A55D is 550V, 14A, Silicon N Channel MOS Type Field Effect Transistor.

An N-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is a type of field effect transistor (FET) that uses an N-type semiconductor material as the conducting channel to control the flow of current.

When a positive voltage is applied to the gate terminal, it attracts electrons to the channel, creating an inversion layer and allowing current to flow between the source and drain terminals.

N-channel MOSFETs are widely used in a variety of electronic applications due to their high input impedance, fast switching speeds, and low power consumption. They are commonly used as switches, amplifiers, and voltage regulators.


• Low drain-source ON-resistance: RDS (ON) = 0.31 Ω (typ.)

• High forward transfer admittance: ⎪Yfs⎪ = 6.5 S (typ.)

• Low leakage current: IDSS = 10 μA (max) (VDS = 550 V)

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

K14A55D datasheet mosfet

Absolute Maximum Ratings (Ta = 25°C)

1. Drain to source voltage: VDSS = 550 V

2. Gate to source voltage: VGSS = ± 30 V

3. Drain current: ID = 14 A

4. Drain Power Dissipation: Pd = 50 W

5. Channel temperature: Tch = 150 °C

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


1. Switching Regulator

K14A55D PDF Datasheet