IRF840 N-Channel Power Mosfet
TheIRF840is an N-Channel Power MOSFET which can switch loads upto 500V. The Mosfet could switch loads that consume upto 8A, it can turned on by providing a gate threshold voltage of 10V across the Gate and Source pin.
Pin Configuration
Pin Number
|
PinName
|
Description
|
1 |
Source |
电流通过源(最多8A) |
2 |
Gate |
Controls the biasing of the MOSFET (Threshold voltage 10V) |
3 |
Drain |
Current flows in through Drain |
Features
·N-Channel Power MOSFET
·Continuous Drain Current (ID): 8A
·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 theIRF840 datasheetlinked at the bottom of the page
Alternatives for IRF840
8N50, FTK480, KF12N50
Other N-channel场效应晶体管S
IRF740, BSS138,IRF520,2N7002, BS170, BSS123, IRF3205, IRF1010E
About IRF840
TheIRF840is an N-Channel Power MOSFET which can switch loads upto 500V. The Mosfet could switch loads that consume upto 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 a I/O pin of a CPU. If you prefer a mosfet with low gate voltage then tryIRF540Nor2N7002etc.
One considerable disadvantage of theIRF840 Mosfetis 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 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.
Applications
- Switching high power devices
- Inverter Circuits
- DC-DC Converters
- Control speed of motors
- LED dimmers or flashers
- High Speed switching applications
2D model of the component
If you are designing a PCB or Perf board with this component then the following picture from the IRF840 Datasheet will be useful to know its package type and dimensions.