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What is hfe and hfc in transistor?

Anonymous

∙ 12y ago

Updated: 4/28/2022

I don't know about hfc, but hFE is the amplification factor by which the transistor amplifies the base current. Therefore, if hFE is 100, the base current is amplified by a factor of 100.

Wiki User

∙ 12y ago

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Q: What is hfe and hfc in transistor?

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For a given hfe calculate hfc in electronic circuits?

how to calculate the value of hfc for a given hfe

What does Hfe stand for in electronics?

HFE is the gain of the transistor

What is the current gain of an NPN transistor?

It depends on which transistor. Typical values of hFe range between 50 and 400. It also depends on the configuration of the circuit, with hFe being a limiting factor, and most designs providing a gain less than hFe.

What percentage of the total current in a transistor flows through the collector?

The total current in a transistor is the emitter current, which is the sum of the collector current and the base current. The ratio of collector current over base current, in linear mode, is beta-DC, or hFe. However, in order for linear mode to be true, the ratings of the transistor must not be exceeded, and the collector current must not be limited by the circuit. Note also that hFe is temperature dependent, and is expressed in the data sheet as a minimum, not an absolute value - it can vary from transistor to transistor.

When a transistor is used as an amplifier increasing the base current will cause an increase in?

Increasing base current causes a proportionate increase in collector current - proportionate to hFe, unless the transistor is operated outside of linear mode.

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Related Questions

For a given hfe calculate hfc in electronic circuits?

how to calculate the value of hfc for a given hfe

What does Hfe stand for in electronics?

HFE is the gain of the transistor

What does the h stand for in the word mother?

the transistor gain is expressed in abrivation hfe. my question is that which are the words the hfe stand for

What is the current gain of an NPN transistor?

It depends on which transistor. Typical values of hFe range between 50 and 400. It also depends on the configuration of the circuit, with hFe being a limiting factor, and most designs providing a gain less than hFe.

How does using a transistor with a different beta affect the operation of the common emitter amplifier?

Gain, in the common emitter amplifier, is beta (hFe) or collector resistance divided by emitter resistance, whichever is less. Substituting a different beta (hFe) transistor will affect gain, if hFe is less, or increase stability and design margin, if hFe is greater.

What is a Darlington transistor composed of?

The darlington configuration is two transistors connected in such a way that the gain (hFe) of the pair is higher than either transistor taken individually. The two collectors are connected together, and used as the collector of the pair. The base of the first transistor is the base of the pair. The emitter of the first transistor is connected to the base of the second transistor. The emitter of the second transistor is the emitter of the pair. Sometimes there is a resistor between the second base and the second emitter, so as to stabilize the pair in certain conditions. Typically, you multiply hFe's in darlington configuration, so if each transistor had an hFe of, say, 100, then the hFe of the pair would be 10,000.

How do you relate h-parameters of ce cc transistors?

hie=hic hfe+1=hfc hoe=hoc hre=hrc

What is the HFE for good transistors?

A: HFE is meaning less uunless current is specified. For a switch force gain of 10 for an amplifier at low level maybe 100 for the same transistor.

What percentage of the total current in a transistor flows through the collector?

The total current in a transistor is the emitter current, which is the sum of the collector current and the base current. The ratio of collector current over base current, in linear mode, is beta-DC, or hFe. However, in order for linear mode to be true, the ratings of the transistor must not be exceeded, and the collector current must not be limited by the circuit. Note also that hFe is temperature dependent, and is expressed in the data sheet as a minimum, not an absolute value - it can vary from transistor to transistor.

What is meant by compensation in transistor?

Temperature (assumed) compensation in a transistor is when you limit gain using resistors so that gain is dependent on resistor ratio instead of on hFe. As an example, in a common emitter, class A, configuration, with the emitter grounded, the gain is hFe. Problem is that hFe varies from device to device, and it is temperature sensistive, having a positive temperature coefficient, making thermal runaway a very real problem. You can compensate for this with an emitter resistor. In combination with the collector resistor, gain is collector resistance divided by emitter resistance, or hFe, whichever is less. If you make sure that hFe is always greater than this ratio, then the gain will be stable and predictable.

What is the difference between a transistor used as a switch and an amplifier?

A transistor used as a switch is operated in saturated mode, where the ratio of base-emitter current over collector-emitter current is far more than hFe, or beta gain. The transistor is either fully on or fully off in this mode. A transistor used as an amplifier is operated in linear mode, where the ratio of base-emitter current over collector-emitter current is equal to or less than hFe, or beta gain. The transistor is partially on in this mode, and is operating as a current controlled current sink.

When a transistor is used as an amplifier increasing the base current will cause an increase in?

Increasing base current causes a proportionate increase in collector current - proportionate to hFe, unless the transistor is operated outside of linear mode.

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