# How Much Voltage Is Needed To Turn On A Transistor?

## How do you calculate VCE?

Calculate Vce using the formula Vce= Vcc – [Ie * (Rc + Re)].

Using the numbers from the previous examples, the equation works as follows: Vce = 12 – 0.00053 (3000 + 7000) = 12 – 5.3 = 6.7 volts..

## How much current is needed to turn on a transistor?

The diode only needs 0.6V to turn on, more voltage than that means more current. Some transistors may only be rated for a maximum of 10-100mA of current to flow through them. If you supply a current over the maximum rating, the transistor might blow up.

## How many volts can a transistor take?

Anyways, if you follow the “datasheets here” link, the NPN transistor included with your kit is a SS9013. This particular transistor is rated for a maximum (collector-emitter) voltage of 20V, and a maximum current of 500 mA. This means that you can switch a (small) 12V device with the transistors you have.

## How do I turn my transistor on?

With a zero signal applied to the Base of the transistor it turns “OFF” acting like an open switch and zero collector current flows. With a positive signal applied to the Base of the transistor it turns “ON” acting like a closed switch and maximum circuit current flows through the device.

## Why do transistors heat up?

The transistor will only heat up if being over driven.. Either something is drawing too much current, you are demanding too much power, or it is being over clocked.. Normally it should only be warm, not a burning to touch feeling if you touch the transistor..

## Which transistor is best for switching?

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.Apr 21, 2014

## How do you calculate the power of a transistor?

The power dissipated in the transistor is the voltage drop across the collector emitter junction times the collector current (neglecting the base current times the 0.75V base emitter drop). In the linear range this could be something like 6V@100mA = 600mW (a lot for a little transistor).

## How many transistors are in a CPU?

The first carbon nanotube computer has 178 transistors and is 1-bit, later one is 16-bit (while the instruction set is 32-bit RISC-V)….Microprocessors.ProcessorIntel 8086 (16-bit, 40-pin)MOS transistor count29,000Date of introduction1978DesignerIntelMOS process (nm)3,000 nm69 more columns

## Why VCE SAT is 0.2 V?

transistor vce voltage drop It is because both the junctions in the transistor are forward biased at saturation. Under this condition, for npn transistor the emitter to base voltage is ~+0.7V and than between the base to collector ~0.5V (base p, collector n).

## What is PNP transistor?

The PNP Transistor is the exact opposite to the NPN Transistor device we looked at in the previous tutorial. … Then, PNP transistors use a small base current and a negative base voltage to control a much larger emitter-collector current.

## What is a transistor symbol?

Transistor Symbols The symbol of NPN and PNP is shown in the figure below. The arrow in the symbol indicates the direction of flow of conventional current in the emitter with forward biasing applied to the emitter-base junction. The only difference between the NPN and PNP transistor is in the direction of the current.

## What is PNP and NPN?

In an NPN transistor, a positive voltage is given to the collector terminal to produce a current flow from the collector to the emitter. In a PNP transistor, a positive voltage is given to the emitter terminal to produce current flow from the emitter to collector.

## Where is PNP transistor used?

PNP transistors are used in amplification circuits. PNP transistors are used in Darlington pair circuits. PNP transistors are used in robotic applications. PNP transistors to control current flow in heavy applications.

## Which leg is which on a transistor?

Transistors typically have one round side and one flat side. If the flat side is facing you, the Emitter leg is on the left, the Base leg is in the middle, and the Collector leg is on the right (note: some specialty transistors have different pin configurations than the TO-92 package described above).

## How does PNP transistor works?

The PNP transistor turns on when a small current flows through the base. The direction of current in PNP transistor is from the emitter to collector. … The base of the PNP transistor has always been negative with respect to the emitter and collector. In PNP transistor, the electrons are taken from the base terminal.

## How does current flow in a NPN transistor?

The NPN transistor is designed to pass electrons from the emitter to the collector (so conventional current flows from collector to emitter). … The base still controls current flow, but that current flows in the opposite direction — from emitter to collector.

## How does a transistor amplify voltage?

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.

## Why is VBE 0.7 V?

The base emitter junction is a PN junction or you can consider that as a diode. And the voltage drop across a silicon diode when forward biased is ~0.7V. That is why most of the books write VBE=0.7V, for an NPN silicon transistor with forward biased emitter junction at room temperature.

## How much power does a transistor use?

A typical value for a small signal transistor is 60 to 80 V. In power transistors, this could range to 1000 V, for example, a horizontal deflection transistor in a cathode ray tube display.

## Why do transistors have 3 legs?

The transistor has three legs, these are the base, collector and the emitter. … The base of the transistor is used to switch current through the collector and emitter. When the base is between 0V and 0.7V it is switched off and above 0.7V it is switched on allowing the current to flow from the collector to the emitter.

## What is the cutoff region?

Cutoff region This is the region in which transistor tends to behave as an open switch. The transistor has the effect of its collector and base being opened. The collector, emitter and base currents are all zero in this mode of operation.