Quick Answer: Are Transistors Interchangeable?

What can we use instead of transistor?

The most obvious alternatives to transistors are vacuum tubes and electromechanical relays.

In addition, magnetic amplifiers (magamps) are useful.

Piezoelectric relays are rare.

Rotating amplifiers, such as amplidyne motor-generator machines are useful at higher power levels..

Are transistors symmetric devices?

The bipolar junction transistor, unlike other transistors, is usually not a symmetrical device. This means that interchanging the collector and the emitter makes the transistor leave the forward active mode and start to operate in reverse mode.

Can I replace mosfet with transistor?

Since switching voltages above 5 V or up to 12 V is easily available from most digital and analogue ICs, mosfets can be quickly interfaced with any source irrespective of the load current. So it means, in general we can easily replace a BJT with a mosfet, provided we take care of the relevant polarities.

How do I choose the right transistor?

When choosing a transistor to use as a switch you need to consider its maximum collector current Ic(max) and its minimum current gain hFE(min). Transistor voltage ratings may be ignored for supply voltages less than 15V.

Which is better PNP or NPN?

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. So a npn transistor is faster in operation than a pnp transistor. … Electrons are better when compared to holes so (npn) is preferred.

Can we replace NPN transistor with PNP?

Generally, the PNP transistor can replace NPN transistors in most electronic circuits, the only difference is the polarities of the voltages, and the directions of the current flow. PNP transistors can also be used as switching devices and an example of a PNP transistor switch is shown below.

Is a transistor a Mosfet?

A MOSFET is a type of transistor commonly used in switching/amplifier type applications, as they are usually designed for higher power use (so called “high power” transistors are mostly MOSFET and Darlington type). There are many other applications for MOSFETs as well, but these are the most common.

What is General Purpose Transistor?

The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. It was originally made in the TO-18 metal can as shown in the picture.

How a transistor works as a switch?

By turning a small input current into a large output current, the transistor acts like an amplifier. But it also acts like a switch at the same time. When there is no current to the base, little or no current flows between the collector and the emitter. … So the base current switches the whole transistor on and off.

What is NPN and PNP transistor?

PNP transistor is made up of two P-type material layers with a layer of sandwiched of N-type. The NPN transistor is made up of two N-type material layers with a layer of sandwiched of P-type. In an NPN-transistor, a +ve voltage is set to the collector terminal to generate a flow of current from the collector.

Are all transistors the same?

Select a replacement transistor of the same material: Most transistors are either silicon or germanium. As bias voltages and other features are different it is necessary to select a replacement transistor with the same material.

What is difference between mosfet and transistor?

The BJT is a bipolar junction transistor whereas MOSFET is a metal oxide semiconductor field-effect transistor. … BJT’s are used for low current applications, whereas MOSFET is used for high power applications. Nowadays, in analog and digital circuits, MOSFETs are treated to be more commonly used than BJTS.

How transistor works as a amplifier?

A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. … Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.

How do you know if a transistor is NPN or PNP?

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. … The NPN transistor always has an arrow pointing out.

Can a transistor be used as a switch?

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.

Which transistor is best?

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.

What is the symbol of PNP transistor?

PNP Transistor Symbol The symbol of P-N-P consists of three terminals emitter, base, and the collector. The arrow is sharply pointing towards the base indicating the flow of current from the emitter terminal to the base.

Why is emitter always forward biased?

Why emitter is always forward biased? Emitter is always forward biased w.r.t base so as to supply majority charge carriers to the base.