Quick Answer: How Do I Choose The Right Transistor?

What is a power transistor?

Page 1.


Power transistors are devices that have controlled turn-on and turn-off characteristics.

These devices are used a switching devices and are operated in the saturation region resulting in low on-state voltage drop.

They are turned on when a current signal is given to base or control terminal..

Why do transistors have 3 legs?

The transistor has three legs, these are the base, collector and the emitter. … The base of the transistor is used to switch current through the collector and emitter. When the base is between 0V and 0.7V it is switched off and above 0.7V it is switched on allowing the current to flow from the collector to the emitter.

How do you match transistors?

A common method of matching transistors is to use a fancy active current source to drive a stable current through the devices one at a time and to record the individual Vbe values. Then matched devices are selected based on the recorded values.

How do you select a transistor for specific operations?

How to Select a Transistor – Linear/Active OperationDevice current gain. … Consider the Bandwidth and Frequency Specifications for high frequency applications.Continuous Current Rating. … RMS Current Rating. … Single Pulse Peak Current. … Power Dissipation. … Collector-emitter voltage with open base (VCEO) … Operating Temperature Range.More items…•Feb 19, 2015

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.

What is P-type transistor?

Works in exactly the opposite fashion from the N-type transistor. When gate is supplied with 0 volts, we have closed circuit like a wire between the source and the drain. When the gate is supplied 2.9 volts, P-type transistor acts like an open circuit with broken connection.

What is a transistor symbol?

Transistor Symbols The symbol of NPN and PNP is shown in the figure below. The arrow in the symbol indicates the direction of flow of conventional current in the emitter with forward biasing applied to the emitter-base junction. The only difference between the NPN and PNP transistor is in the direction of the current.

How is VBE measured?

This can be done using the formula: Vcc = Vrc + Vrb + Vbe + (Ic + Ib)Rc + IbRb + Vbe, where “Vrc” is the voltage across the collector resistor; “Vrb” is the voltage across the base resistor (connected across the base) and the junction between the collector resistor and the transistor collector; and “Vbe” is the voltage …

What are transistor parameters?

A parameter is a characteristic or property of a transistor which identifies it and distinguishes it from another similar transistor. In choosing a particular transistor to do a specific job, a comparison of parameters is the means by which the most suitable component can be selected.

How do I know which transistor to use?

Choosing a Suitable PNP or NPN Transistor SwitchThe transistor’s maximum collector current must be greater than the load current.The transistor’s maximum current gain must be at least 5 times the load current divided by the maximum output current from the IC.Choose a transistor which meets the requirements and making a note of its properties.More items…•Mar 13, 2012

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.

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.

What is transistor and uses?

Transistors are a three terminal semiconductor device used to regulate current, or to amplify an input signal into a greater output signal. Transistors are also used to switch electronic signals.

What is the common types transistor?

Transistors are basically classified into two types; they are Bipolar Junction Transistors (BJT) and Field Effect Transistors (FET). The BJTs are again classified into NPN and PNP transistors. The FET transistors are classified into JFET and MOSFET.

Which is better PNP or NPN transistor?

A NPN transistor has electrons as majority charge carriers whereas the PNP transistor has holes as majority charge carrier. The mobility of electrons is better than mobility of holes. … mobility of electrons is more than hole,so as a result npn transistor are faster than pnp that’s why they are preferred..

What is NPN and PNP transistor?

In an NPN transistor, a positive voltage is given to the collector terminal to produce a current flow from the collector to the emitter. In a PNP transistor, a positive voltage is given to the emitter terminal to produce current flow from the emitter to 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.

How do you match JFETs?

Measuring JFETsGet a 5 to 13 volt supply and a DC voltmeter (we used 12V)Connect the +V to the Drain.Connect the Gate and Source together to a 100Ω resistor.Connect the other lead of the resistor to ground.Measure the voltage across the resistor, which gives the Idss (1 volt = 10 mA of current)More items…

What matched transistor?

Compared to standard double transistors, they ensure accurate base-emitter voltage and current gain matching, and are fully internally isolated. …

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.

What is the difference between transistors?

The main difference between the two types of transistors is that holes are the more important carriers for PNP transistors, whereas electrons are the important carriers for NPN transistors. Then, PNP transistors use a small base current and a negative base voltage to control a much larger emitter-collector current.