IRF740 N-Channel Power Mosfet Features, Application

IRF740 MOSFET N-channel

The IRF740 is an N-Channel Power MOSFET that can switch loads upto 400V. This Mosfet could switch loads that use upto 10A, it can turn on by provide a gate threshold voltage of 10V across the Gate and Source pin. Since the IRF740 mosfet is for switching high current high voltage loads it has a relative high gate voltage, Hence, cannot be used directly with a I/O pin of a CPU. If you prefer a mosfet with low gate voltage then try IRF520 or BSS138 etc.

One significant disadvantage of this Mosfet is its high on-resistance (RDS) cost which is about 0.55 ohms. But the IRF740 mosfet cannot be used in applications where high switching efficiency is required. The Mosfet requires a driver circuit to provide 10volt to the gate pin of this Mosfet the easiest driver circuit can be make using a transistor. This is comparatively cheap and has very low thermal resistance, added to this mosfet also has very good switching speeds and consequently can be used in DC-DC converter circuits.

Pin Configuration Of  IRF740 N-Channel Power Mosfet

IRF740 MOSFET N-channel 

IRF740 Pinout detail
Pin# Name Symbol Type Function
1 Gate G P-Type Controls the current between Drain and Source
2 Drain D N-Type Electrons Emitter(Drain)
3 Source S N-Type Electrons Collector(Source)

IRF740 Pinout consist of 3 pins in total. These pins along with name and types are given above table. Electrons flow from Drain to source terminal. The output current depends on the voltage applied to the Gate terminal.

Features of IRF740

  •   Gate threshold voltage (VGS-th) is 10V (limit = ±20V)
  •  N-Channel Power MOSFET
  • Continuous Drain Current (ID): 10A
  • Drain Source Resistance (RDS) is
  • Drain to Source Breakdown Voltage: 40
  • Available in To-220
  • Rise time and fall time is 27nS and 24ns

Alternate of IRF740

The Alternate of IRF740 are:IRFB13N50A, UF450A, SSF13N15,BSS138, IRF520, IRF3205, 2N7002, BS170, IRF1010E, BSS123

Applications of IRF740

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

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