IRF840 N-Channel MOSFET (8A,500V,0.85Ω)

IRF840 N-Channel Power Mosfet IRF840 Pinout

The IRF840 is an N-Channel Power MOSFET that can switch loads up to 500V. The Mosfet could switch loads that consume up to 8A, it can turned on by providing a gate threshold voltage of 10V across the Gate and Source pin.

Pin Configuration

Features

• N-Channel Power MOSFET
• Continuous Drain Current (ID): 8A
• The gate threshold voltage (VGS-th) is 10V (limit = ±20V)
• Drain to Source Breakdown Voltage: 500V
• Drain Source Resistance (RDS) is 0.85 Ohms
• Rise time and fall time is 23nS and 20nS
• Available in To-220 package

Note: Complete technical details can be found at the IRF840 datasheet linked at the bottom of the page

About IRF840

The IRF840 is an N-Channel Power MOSFET that can switch loads up to 500V. The Mosfet could switch loads that consume up to 8A, it can turned on by providing a gate threshold voltage of 10V 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 2N7002 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 10V to the gate pin of this Mosfet the simplest driver circuit can be built 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.

Applications

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

IRF840 Datasheet