IRF640 is a N channel Power MOSFET, it can handle 200 volt and 18A current. The on resistance of this MOSFET is approx. 0.18 ohms. This MOSFET is comes in TO 220 packaging. In this article I’m sharing the Pinout, equivalent and specifications of IRF640.
What is IRF640 MOSFET?
This IRF640 is a powerful N channel mosfet can handle drain to source voltage around 200V and continuous Drain current is 18A. The internal resistance is very low and it will be 0.18 ohms. So we use it in fast switching circuits. The power dissipation of this MOSFET is around 125 Watt. This component is mainly used in DC to DC converter, UPS system and Motor driver circuits.
IRF640 MOSFET Pinout
Pinout Configuration
| Pin Number | Pin Name |
|---|---|
| 1 | Gate (G) |
| 2 | Drain (D) |
| 3 | Source (S) |
| Tab | Drain (D) |
Specifications
- Type : N channel MOSFET
- Drain source voltage is 200V
- Drain continuous current is 18A
- on Resistance is 0.15 to 0.18 ohms
- Power dissipation is 125 watt.
- Gate-source voltage is 20V
- Packaging TO-220
What is the use of IRF640?
The MOSFET can handle 200V and 18A current so we can use this MOSFET in medium power handling circuit and projects which are Class D amplifier, DC to DC converter and switching circuits.
What is the difference between IRF740 and IRF640?
| Parameter | IRF640 | IRF740 |
|---|---|---|
| MOSFET Type | N Channel | N Channel |
| Maximum Drain-Source Voltage (VDS) | 200V | 400V |
| Continuous Drain Current (ID) | 18A | 10A |
| RDS(on) (On Resistance) | Lower (0.18Ω) | Higher (0.55Ω) |
| Power Dissipation | 125W | 125W |
| Gate Threshold Voltage | 2V to 4V | 2V to 4V |
| Switching Speed | Faster | Slightly slower |
| Best Use | High current applications | High voltage applications |
| Common Applications | UPS, motor drivers, inverters and SMPS | High voltage SMPS, inverters and motor control |
| Package | TO 220 | TO 220 |
| Main Advantage | Handles more current | Handles much higher voltage |
Equivalent MOSFETS for Replacement
- IRF640N
- STP19NB20
- IRFB23N20D
- IRFB4620
✔ Check Drain to source voltage, internal on resistance and Continuous current and pinout configuration before replacing.
Frequently Asked Questions
When a gate voltage received the current passing through the source pin to drain pin. So it is also act as a switch. When sufficient gate voltage get the MOSFET conducts.
The maximum power dissipation of IRF640N is in between 125 to 150 watts.
Maximum gate source voltage is +/- 20V and the recommended driving voltage is 10 to 12V.
