Can we connect two diodes back to back to make transistor?

Can we connect two diodes back to back to make transistor?

No, two diodes connected back to back cannot be used as a transistor. A PN diode will have equal doping on both sides, but for a transistor, the base must have the least doping level and the emitter must be highly doped. Joining two diodes will make the base size larger than the emitter and the collector.

Can you make a transistor from two diodes?

You just can’t. There’s a transistor-model which is explained with two diodes and you can measure the two diodes in the transistor but you cannot make a transistor with two diodes.

What happens when 2 diodes are connected back to back?

If you have two diodes connected back to back,essentially you would have one diode forward biased during one cycle of the supply but the other diode is reversed biased. Current does not flow.

Why two discrete diodes connected back to back Cannot behave as a transistor?

In n-p-n transistor, the free electrons passing through the base to the collector have a short life time. As long as base thin, the free electrons can reach the collector. Hence two diodes connected back-to-back can never work as a transistor.

Do transistors act as diodes?

Since a bipolar transistor is essentially two diodes, it can function as such. However, since bipolar transistors are not designed to be used as diodes, using them as diodes might cause a problem in terms of current and other ratings.

Can two pn junction diodes placed back to back work as PNP transistor?

No, because in this case n-region will be too thick and so most of the majority charge carriers rushing from emitter to collector will be neutralized in the base. As a result the transistor will not work.

Are transistor made of diodes?

A bipolar transistor essentially consists of two junction diodes on semiconductor material having positive (p) and negative (n) polarities. A transistor with two positive layers surrounding a negative layer is known as a pnp transistor, and a device with two negative layers around a positive layer is an npn transistor.

When two diodes are connected in a rectifier circuit it allows?

A two diode circuit is able to provide full wave rectification when used with a centre tapped transformer.

Can two diodes connected back to back act as faithful BJT?

Summary: Two back-to-back PN diodes can’t function as a single BJT because transistor’s functionality requires semiconductor only Base region. Once a metal introduced in this path (which is what two back-to-back diodes represent) , no BJT functionality is possible.

Can we make a transistor with two diodes for use as fully functional transistor if yes then how if no then why?

This doesn’t work because base region is wide and are equally doped, whereas in actual transistor base is very thin and lightly doped. In two discrete diodes connected back-to-back, has 4 doped regions instead of 3. Hence, two diodes connected back-to-back can never be used as a transistor.

Can two diodes connected back-to-back act as faithful BJT?

Who invented transistors?

William Shockley
John BardeenWalter Houser Brattain
Transistor/Inventors

John Bardeen, Walter Brattain and William Shockley invented the first working transistors at Bell Labs, the point-contact transistor in 1947. Shockley introduced the improved bipolar junction transistor in 1948, which entered production in the early 1950s and led to the first widespread use of transistors.