What happens if you put a transistor in backwards?
Yes current can flow in both directions. An NPN transistor backwards is also an NPN. There will still be a reverse beta, however, the backwards NPN transistor won’t work as well as a correctly oriented one will. It’s not recommended.
Are transistors reversible?
The transistor is in reverse active mode. The collector acts as the emitter and the emitter as the collector. This is possible because NPN reversed is still NPN. The performance is worse than in forward active mode, because emitter and collector usually have different doping levels and a different structure.
Is a transistor reverse biased?
For a proper functioning of the transistor, the emitter-base region must be forward-biased and collector-base region must be reverse-biased. In semiconductor circuits, the source voltage is called as the bias voltage. In order to function, bipolar transistors must have both junctions biased.
Do all transistors work the same way?
So yes transistors are interchangeable, if the type (npn/pnp) and required specs match. If the current through a transistor was only 10mA and they have a part that can tolerate 1A, well, that’s a bit much, and you can find a part that is more suited to what the circuit it.
Which way does current flow in a transistor?
Current freely flows from collector to emitter. Cut-off — The transistor acts like an open circuit. No current flows from collector to emitter. Active — The current from collector to emitter is proportional to the current flowing into the base.
Does a transistor have polarity?
The NPN transistor always has an arrow pointing out. It is clear that the current directions and voltage polarities in PNPs and NPNs are always opposite to each other. NPN transistors require a power supply with positive polarity with respect to common terminals, but PNP transistors require a negative power supply.
Why are transistors biased?
Biasing is the process of providing DC voltage which helps in the functioning of the circuit. A transistor is based in order to make the emitter base junction forward biased and collector base junction reverse biased, so that it maintains in active region, to work as an amplifier.
How do I know if my transistor is blown?
A bad transistor can sometimes be detected by its partly burned or distorted appearance, but more often there is no visible indication. One approach to troubleshooting is to substitute a known good component, but that is a costly way to go.
What can replace transistors?
IBM aims to replace silicon transistors with carbon nanotubes to keep up with Moore’s Law. A carbon nanotube that would replace a silicon transistor. Image courtesy of IBM.