When it comes to electronics, the world of semiconductors is a major topic of discussion. To be precise, MOSFET is commonly used in various industrial applications as well as by hobbyists. These are the building blocks of all digital electronics, and each type has a specific use.
2N7002 is one of the most widely used MOSFETs, and it is used as a base for a variety of transistors. In this article, you will learn everything you need to know about the 2N7002 transistor.
What is a MOSFET?
First things first. Before we go into 2N7002 transistors, let’s have a basic understanding of a MOSFET. MOSFET stands for Metal Oxide Semiconductor Field Effect Transistor.
The main component of this transistor is the field-effect transistor, which is a special type of transistor. The MOSFET is mainly used as a voltage regulator. It uses the voltage difference to control the flow of current.
There are two types of MOSFETs: intrinsic and extrinsic. The intrinsic MOSFET has a special property and that is it can be used as a voltage regulator. The extrinsic MOSFET, on the other hand, is used in amplifiers and oscillators.
What is 2N7002 MOSFET?
2N7002 is a MOSFET is an N-type transistor that is used to reduce the on-state resistance. This simply means that it will reduce the voltage drop across the load. This can be used in a variety of applications such as DC to AC converters, DC to DC converters, and various other applications.
2N7002 is also known as 2N7002 N-channel MOSFET. N-channel MOSFET is a transistor that uses negative charge carriers like electrons for its operation.
Structure of 2N7002 Transistor
The 2N7002 MOSFET has three terminals: source, gate, and drain. The source terminal is connected to the positive supply voltage while the drain terminal is connected to the load (or output). The gate terminal is used to control the flow of current through the channel between the source and drain terminals.
The 2N7002 MOSFET contains two p-type silicon layers sandwiched by an n-type silicon layer.
The n-type silicon layer forms a channel in between the source and drain terminals that are separated by a dielectric layer. The p-type silicon layer forms the source and drain terminals that are separated by a dielectric layer.
The structure simply implies that the 2N7002 MOSFET is a voltage-controlled device that can be turned on or off by a voltage applied to its gate terminal. This means that when sufficient voltage is applied to the gate terminal, it will allow current to flow through the channel between the source and drain terminals, thus turning it ON and allowing current to flow through the load (Vout).
The gate of 2N7002 MOSFET acts as a capacitor when connected to an AC supply. This means that when connected to an AC supply, it will charge up during one-half cycle and then discharge during another half cycle.
How 2N7002 MOSFET Works
To understand the working formula of 2N7002, you simply need to know the basic working principle of MOSFET. We know that MOSFETs work by the movement of charge carriers, or electrons. Once you connect a voltage at the gate of the MOSFET, it will facilitate the movement of charges from the source to the gate terminals.
2N7002 MOSFET isn’t very different, you only need to know that it is an N-channel MOSFET, meaning that the source and the drain comprise the N materials. On the other hand, the substrate is a P-type material.
Introducing a positive voltage at the gate of the terminal will trigger the movement of charge carriers from the source to the drain. The result is that the voltage level across the drain and source terminal is reduced. This means that when a positive voltage is applied at the gate, it will create an electric field in order to balance it.
This electric field is responsible for moving charge carriers from the source to the drain terminal, thus reducing its voltage level.
From the working principle, it is clear that the conductivity of a 2N7002 transistor depends on the amount of voltage applied across the terminal. The more voltage, the higher the number of electrons that will be able to flow through the channel.
Features of 2N7002 MOSFET
Now let’s have a complete breakdown of the key features and characteristics of 2N7002 MOSFET.
-High cell density: Cell density transistors is defined as the number of transistors in one square centimeter. The more transistors, the more the cell density. This a key feature of the 2N7002 MOSFET
-Constant drain current: This means that the flow of current is constant irrespective of the voltage applied to the gate.
-High switching speed: The switching speed or turn-on time is defined as the time required to change from one state to another. The faster the switching, the faster will be the response of a circuit.
-Low standby power consumption: This means that when there is no load on a transistor, it consumes a very less amount of power.
-High reliability: 2N7002 transistor has high reliability and this helps in reducing cost in comparison to other semiconductor devices. The cost reduction helps in improving yield and reducing cost thus increasing profit margin for manufacturers.
-Low noise: Noise in this context refers to the random signals generated by the semiconductor devices. The lower the noise, the better the performance of a device.
In the same context, 2N7002 MOSFET tends to have a low distortion level. This means that there is no distortion in the output signal of a circuit. The distortion is caused when there are variations in voltage or current from what is expected.
-Low gate threshold voltage: This refers to the voltage that is required to turn on a transistor. The lower the voltage, the faster can be the switching of a transistor in comparison to other semiconductors.
-Low on-resistance: This means that a transistor that has low resistance can be used in high power applications since it consumes a very less amount of power when compared to other semiconductors.
-Low capacitance: The capacitance of a transistor is defined as the amount of charge stored per unit area when there is no applied voltage across it. The lower the value, the higher its capability and performance.
How do you use 2N7002 MOSFET?
Usually, 2N7002 MOSFET is integrated into a circuit to provide a specific function. In many applications, it is used in a switch circuit. Here, the MOSFET is used to control the flow of voltage from one point to another.
In the same context, 2N7002 MOSFET is also integrated into a circuit for controlling the flow of current through an electrical circuit or a device. Here, it does this by switching on or off an input or output signal.
Applications of 2N7002 MOSFET
Now let’s look at the application areas or uses of the 2N7002 transistors.
-Used as switches: From the working principle, we cannot underestimate the switching capability of 2N7002 MOSFET. In a circuit, this type of transistor is used as a switch to control the flow of current from one point to another.
-Used in a motor drive: In many motor drives in eMobility. This is done by controlling the voltage at both ends of the transistor. Here, it is connected in such a way that when it gets switched on, it will allow current to pass through it and vice versa when it gets switched off. This application is common in most electrical cars and bikes
-Used in an inverter: The inverter converts an alternating voltage into direct voltage. It can be controlled using 2N7002 MOSFETs. It helps convert DC (direct current) into AC (alternating current). Here, 2N7002 MOSFETs are used as switches and are controlled by the circuit to switch on and off the inverter with a control signal.
-Used in frequency converters: In this application, the 2N7002 transistors serve as a switch. This is done by controlling its gate voltage or current. It is connected so that when it gets switched on, it will allow current to pass through it and vice versa when it gets switched off. This application is common in most electronic devices like watches, TV sets, calculators, etc.
What should I look for when buying 2N7002 MOSFET?
So you want to get the best 2N7002 transistor for your application? Some of the key things to look out for include;
-Capacitance: The capacitance of the transistor plays an important role in how it performs when it is switching. It should be as low as possible.
-Voltage rating: The voltage rating of the transistor should be high enough to support its working.
-Polarity: The polarity of a MOSFET can be either N (positive) or P (negative). It is important to check this before buying one.
-Metal case: Most transistors are made from plastic nowadays and there are some exceptions. However, you should get a MOSFET that is made from metal to ensure that you get a good performance out of it.
–Low on-resistance: The on-resistance of the MOSFET is the resistance that it has when it gets switched off. This is important because if the transistors have high on-resistance, they will heat up due to increased current and will cause them to fail prematurely.
2N7002 transistors are incredibly important as they play an important role in almost all electronic circuits. They are also essential when it comes to the overall performance of a circuit.
As such, you should ensure that you get the best 2N7002 transistor for your application.
You can get these transistors in China through a reliable sourcing agent such as ICRFQ. We will connect you to top manufacturers and suppliers.
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