Contents
Which transistor is best to use as 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.
How do I know which transistor to use?
Choosing a transistor and base resistor for a digital IC output
- Choose the right type of transistor, NPN or PNP.
- Find out the supply voltage(s) and load properties.
- Work out the transistor properties required.
- Work out a value for the base resistor R.
- Check if you need a protection diode.
How the transistor acts 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.
In which region transistor should be operate for on switch?
A transistor works in active region when worked as an Amplifier. When a transistor works as a Switch it works in Cutoff and Saturation Regions. In the Cutoff State both Emitter Base Junction and Collector Base junctions are reverse biased. But in saturation region both junctions are forward biased.
What is the most commonly used transistor arrangement?
The common emitter application has highest amount of voltage gain and is most commonly used configuration.
Which transistor is mostly used?
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.
Which is the most commonly used transistor arrangement?
What is transistor diagram?
Diagram ‘A’ shows an NPN transistor which is often used as a type of switch. A small current or voltage at the base allows a larger voltage to flow through the other two leads (from the collector to the emitter). The circuit shown in diagram B is based on an NPN transistor.
What is the symbol of PNP transistor?
The PNP Transistor is denoted by the letters PNP. In the diagram below, the symbol for a PNP transistor is depicted. In a PNP transistor, the current flows from the emitter to the collector, as shown by the inward arrow.
What is the principle of transistor?
A transistor consists of two PN diodes connected back to back. It has three terminals namely emitter, base and collector. The basic idea behind a transistor is that it lets you control the flow of current through one channel by varying the intensity of a much smaller current that’s flowing through a second channel.
How many depletion layers are there in a transistor?
A bipolar junction transistor, shortly termed as BJT is a current controlled device that consists of two PN junction for its function. and there are two areas of depletion….Thank you.
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How to use transistor as a switch with example circuits?
But the output of the AND gate is only 5 volts By using a transistor as a switch, we can drive 12v or even high voltage loads with a 5-volt digital logic signal We can also use these devices for faster switching and pulse width modulation control unlike traditional mechanical switches In this example, we use dc motor control through a switch.
What’s the maximum current a transistor can draw?
According to the datasheet for this motor, at 12VDC with no load it only draws 76 mA, but if you stall the motor it shoots up to 1250 mA, or 1.25 Amps. A motor always consumes the maximum current when stalled.
What is the base voltage of a transistor?
Assume that a transistor has a base resistance value of 50kOhm, the resistance at the collector edge is 0.7kOhm and the applied voltage is of 5V and considers beta value as 150. At the base edge, a signal that varies between 0 and 5V is applied.
Can a PNP transistor be used as a switch?
A motor always consumes the maximum current when stalled. Thus the load voltage is 12VDC and the maximum load current is 1.25 A Vload = 12V Iload (max) = 1.25A In general, we can use both PNP or NPN transistors as switches. However, PNP transistors can only control the same voltage as is supplied to the Arduino chip.