IRF840 N-channel 8A 500V Power MOSFET

The IRF840 is an

• N-Channel Power MOSFET
which can switch loads up to 500V. The Mosfet could switch loads that consume up to 8A, it can turn on by providing a gate threshold voltage of

1

0V across the

Gate

and

Source

pin. Since the MOSFET is for switching high current high voltage loads it has a relatively high gate voltage, hence cannot be used directly with an I/O pin of a CPU. If you prefer a mosfet with low gate voltage then try IRF540N or

2

N700

2

etc.

One considerable disadvantage of the IRF840 Mosfet is its high on-resistance (RDS) value which is about 0.85 ohms. Hence this mosfet cannot be used in applications where high switching efficiency is required. The Mosfet requires a driver circuit to provide

1

0V to the gate pin of this Mosfet the simplest driver circuit can be build using a transistor. It is relatively cheap and has very low thermal resistance, added to this the mosfet also has good switching speeds and hence can be used in DC-DC converter circuits.

Pin Configuration:

Pin Number

Pin Name

Description

1

Source

Current flows out through

Source

(maximum 8A)

2

Gate

Controls the biasing of the MOSFET (Threshold voltage

1

0V)

3

Drain

Current flows in through

Drain

Features:

• N-Channel Power MOSFET
Continuous

Drain

Current (ID): 8A

Gate

threshold voltage (VGS-th) is

1

0V (limit = ±

2

0V)

Drain

to

Source

Breakdown Voltage: 500V

Drain

-

Source

Resistance (RDS) is 0.85 Ohms Rise time and the fall time is

2

3

nS and

2

0nS Available in To-

2

2

0 package

Applications:

• Switching high power devices
• Inverter Circuits
• DC-DC Converters
• Control speed of motors
• LED dimmers or flashers
• High-Speed switching applications

Datasheet: Download

Package Includes:

1

x IRF840 N-channel 8A 500V Power MOSFET

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