Quick Answer: How Do You Select A Transistor For Specific Operations?

What is the difference between BJT and FET?

BJT and FET are electronic devices.

The basic difference between BJT and FET is that the bipolar junction transistor is the bipolar and current control device, while FET (field effect transistor) is the unijunction transistor.

It is a voltage control device..

What is transistor diagram?

Diagram ‘A’ shows an NPN transistor which is often used as a type of switch. A small current or voltage at the base allows a larger voltage to flow through the other two leads (from the collector to the emitter). The circuit shown in diagram B is based on an NPN transistor.

What are the different types of transistors?

Some types of transistors are listed below:Bipolar Junction Transistor.Diffusion Transistor.Avalanche Transistor.Schottky Transistor.Darlington Transistor.Heterojunction Bipolar Transistor.Field Effect Transistor.Junction FET Transistor.More items…

What’s the difference between NPN and PNP transistors?

An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. … NPN and PNP transistors have very similar schematic symbols. The only difference is the direction of the arrow on the emitter.

How much current can a transistor handle?

It’s usually around 100, but can range from 50 to 200…even 2000, depending on which transistor you’re using and how much current is running through it. If your transistor had a β of 100, for example, that’d mean an input current of 1mA into the base could produce 100mA current through the collector.

What are the 2 types of transistors?

Basic Electronics – Types of TransistorsThe primary transistor is the BJT and FET is the modern version of transistor. Let us have a look at the BJTs. … The types of BJT are NPN and PNP transistors. … The FET is a unipolar device, which means that it is made using either p-type or n-type material as main substrate. … Source.

Which type of transistor is most commonly used?

MOSFETThe MOSFET is by far the most widely used transistor for both digital circuits as well as analog circuits, accounting for 99.9% of all transistors in the world. The bipolar junction transistor (BJT) was previously the most commonly used transistor during the 1950s to 1960s.

How do you specify a transistor?

So below are some of the important parameters to keep in mind while selecting a transistor.Type number.Current Gain (β)Collector-Emitter Voltage (VCEO)Emitter-Base Voltage (VEBO)Collector current (IC)Total Power Dissipation (Ptot)Apr 28, 2020

How can we select a better transistor?

Transistor data is available from most suppliers, for example see Rapid Electronics.Choose the right type of transistor, NPN or PNP. … Find out the supply voltage(s) and load properties. … Work out the transistor properties required. … Work out a value for the base resistor R. … Check if you need a protection diode.

How do you choose a base resistor for a transistor?

To calculate the base resistor, subtract the B-E 0.7V from the driver voltage and divide by the base current: 4.5-0.7 = 3.8V / 400uA = ~9.5K ohms max. The difference in CE drop between a factor of ten and using the beta is neglible for relatively slow on/off circuits, and it lowers the driver current requirement.

Which transistor is best for switching?

Best Transistors: BJTs#1 NPN – 2N3904. You can find most often NPN Transistors in low-side switch circuits. … #2 PNP – 2N3906. For high-side switch circuits, you need a PNP style BJT. … #3 Power – TIP120. … #4 N-Channel (Logic Level) – FQP30N06L.Apr 21, 2014

Which is the fastest switching device?


What is transistor switching?

A Transistor switch, which is used for opening or closing of a circuit, that means the transistor is commonly used as a switch in the electronic devices only for the low voltage applications because of its low power consumption. Transistor work as a switch when it is in cutoff and saturation regions.

Is 2N7000 NPN or PNP?


What is the PNP transistor?

Definition: The transistor in which one n-type material is doped with two p-type materials such type of transistor is known as PNP transistor. … The PNP transistor turns on when a small current flows through the base. The direction of current in PNP transistor is from the emitter to collector.

Which is faster BJT or FET?

Therefore BJTs are more suitable than MOSFETs for driving low-power LEDs and similar devices from Micro Controllers Unit (e.g. Arduino). BJT can switch faster than MOSFET due to the less capacitance at the control pin. However MOSFET is more tolerant to heat (stable to thermal changes) and can simulate a good resistor.

Why VCE SAT is 0.2 V?

transistor vce voltage drop It is because both the junctions in the transistor are forward biased at saturation. Under this condition, for npn transistor the emitter to base voltage is ~+0.7V and than between the base to collector ~0.5V (base p, collector n).

When would you use a transistor?

One of the most common uses for transistors in an electronic circuit is as simple switches. In short, a transistor conducts current across the collector-emitter path only when a voltage is applied to the base. When no base voltage is present, the switch is off. When base voltage is present, the switch is on.