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What is a switching transistor?
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 normal transistor and power transistor?
A transistor is a three-terminal semiconducting device. Usually, a power transistor has a heat sink attached to it to remove the heat from the device and keep it cool. Normal transistors are used for switching, and amplifying purposes and power transistors are used in battery charger circuits and power supply circuits.
Can we use ordinary transistor in place of switching transistor?
The short answer is no. Simple diodes on their own cannot work as a switch. Looking at it simply, diodes are two terminal devices that allow current to flow in one direction between the terminals but not the other.
How can transistor be used as 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.
What is the most common type of transistor?
MOSFET
The 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.
Are all transistors the same?
All the transistors are not the same. Based on the structure, the transistors are classified as Bipolar Junction Transistor and Field Effect Transistor. The Bipolar Junction Transistors are further classified as PNP and NPN depending on the construction.
How do I know which transistor to use?
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.
What is an amplifier and switch?
We also know that the transistor when used in the cutoff or saturation state, acts as a switch and then operated in the active region is used as an amplifier. In this piece of article, we will learn how a transistor is used as a switch and as an amplifier, in detail.