However, the junction transistor was a relatively bulky device that was difficult to manufacture on a mass-production basis, which limited it to a number of specialised applications. FETs were theorized as potential alternatives to junction transistors, but researchers were unable to build practical FETs, largely due to the troublesome surface state barrier that prevented the external electric field from penetrating into the material. A breakthrough came with the work of Egyptian engineer Mohamed M. Atalla in the late s. This is known as surface passivation , a method that later became critical to the semiconductor industry as it made possible the mass-production of silicon semiconductor technology, such as integrated circuit IC chips.
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This mosfet can drive loads upto 23A and can support peak current upto A. It also has a threshold voltage of 4V, which means it can easily driven by low voltages like 5V. Hence it is mostly used with Arduino and other microcontrollers for logic switching. Speed control of motors and Light dimmers are also possible with this Mosfet since it has good switching characteristics.
So if you are looking for a Mosfet to switch applications that consume high current with some logic level devices then this Mosfet will be a perfect choice for you.
Meaning, they can be turned on or turned off by supplying the required Gate threshold voltage VGS. When a gate voltage is applied these pins gets closed.
The below circuit shows how this mosfet behaves when the Gate voltage is applied 5V and not applied 0V. Since this an N-Channel mosfet the load that has to be switched in this case a motor should always be connected above the drain pin.
When you turn on a Mosfet by supplying the required voltage to the gate pin, it will remain on unless you supply 0V to the gate. To avoid this problem we should always use a pull-down resistor R1 , here I have used a value of 10k. To tackle this we should use a current limiting capacitor, I have a used a value of here.
Les transistors Mosfet de puissance
IRF830 MOSFET. Datasheet pdf. Equivalent