Table of Contents
Can a transistor be used as a switch?
Transistor switches can be used to switch and control lamps, relays or even motors. When using the bipolar transistor as a switch they must be either “fully-OFF” or “fully-ON”.
Which transistor is best for a switch?
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.
Can I use BC557 instead of BC558?
Yes. You can use BC557 in place of BC547. And similarly, you could use BC558 in place of BC557.
What is the use of BC558 transistor?
This transistor is made to use in different electronic circuits applications. For instance, if it is used as a switch then it controls the load blow 100mA such as ICs, relays, LEDs, transistors, and many more. Alternatively, it can also be used as an audio amplifier, a preamplifier for amplification of the signal.
What is the advantage of using a transistor as a switch?
Transistor switch is economical than other switches. It gives trouble free service because of its solid state nature. It has no moving parts and hence there is no tear and wear. It gives noiseless operation.
Why transistor is called as a switch?
The transistor operates as a Single Pole Single Throw (SPST) solid state switch. When a zero input signal applied to the base of the transistor, it acts as an open switch. If a positive signal applied at the input terminal then it acts like a closed switch.
Which transistor can be used in place of BC548?
BC548 Equivalents BC548 can be replaced by BC547, BC549, 2N2222, 2N3904, and BC550, though the pin configuration of some transistors may be different from BC548, so please check the pin configuration first before replacing in a circuit.
What type of transistor is BC558?
based bipolar junction transistor
What is BC558 Transistor? BC558 is a PNP family-based bipolar junction transistor, used in switching & amplification-based applications. It includes three terminals that are collector, base & emitter which are dissimilar in terms of doping concentrations, functions, and size.
What is a transistor as a switch?
A transistor can be used as a solid state switch. If the transistor is operated in the saturation region then it acts as closed switch and when it is operated in the cut off region then it behaves as an open switch. The transistor operates as a Single Pole Single Throw (SPST) solid state switch.
What is a transistor switch?
Transistor switches can be used to switch a low voltage DC device (e.g. LED’s) ON or OFF by using a transistor in its saturated or cut-off state When used as an AC signal amplifier, the transistors Base biasing voltage is applied in such a way that it always operates within its “active” region, that is the linear part of the output
Why do we use multiple switching transistors in bipolar transistors?
Sometimes the DC current gain of the bipolar transistor is too low to directly switch the load current or voltage, so multiple switching transistors are used. Here, one small input transistor is used to switch “ON” or “OFF” a much larger current handling output transistor.
What type of transistor is used in motor control circuit?
We can use any transistor according to power rating of the motor. In conclusion, if a control signal at the base input is 0 volts. It will provide an ON signal. Because we use a PNP switch in this example circuit. Similarly, it will remain off, its control signal is logic HIGH.
Can a PNP transistor be used as a switch?
PNP Transistor Switch We can also use the PNP Transistors as a switch, the difference this time is that the load is connected to ground (0v) and the PNP transistor switches the power to it. To turn the PNP transistor operating as a switch “ON”, the Base terminal is connected to ground or zero volts (LOW) as shown.