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Collector Charging Time Formula

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Collector charging time refers to the time taken for the minority carriers in the base region of a BJT to be swept out of the collector region after the transistor is turned off. Check FAQs
τc=τec-(τscr+τb+τe)
τc - Collector Charging Time?τec - Emitter Collector Delay Time?τscr - Base Collector Delay Time?τb - Base Transit Time?τe - Emitter Charging Time?

Collector Charging Time Example

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With units
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Here is how the Collector Charging Time equation looks like with Values.

Here is how the Collector Charging Time equation looks like with Units.

Here is how the Collector Charging Time equation looks like.

6.4Edit=5295Edit-(5.5Edit+10.1Edit+5273Edit)
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Collector Charging Time Solution

Follow our step by step solution on how to calculate Collector Charging Time?

FIRST Step Consider the formula
τc=τec-(τscr+τb+τe)
Next Step Substitute values of Variables
∴ τc=5295μs-(5.5μs+10.1μs+5273μs)
Next Step Convert Units
∴ τc=0.0053s-(5.5E-6s+1E-5s+0.0053s)
Next Step Prepare to Evaluate
∴ τc=0.0053-(5.5E-6+1E-5+0.0053)
Next Step Evaluate
∴τc=6.40000000000016E-06s
Next Step Convert to Output's Unit
∴τc=6.40000000000016μs
LAST Step Rounding Answer
∴τc=6.4μs

Collector Charging Time Formula Elements

Variables
Collector Charging Time
Collector charging time refers to the time taken for the minority carriers in the base region of a BJT to be swept out of the collector region after the transistor is turned off.
Symbol: τc
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Collector Charging TimeOpen Variable
Emitter Collector Delay Time
Emitter collector delay time is defined as the transit time across the base-collector depletion region or space.
Symbol: τec
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Emitter Collector Delay TimeOpen Variable
Base Collector Delay Time
Base Collector Delay Time refers to the additional time taken by the signal to propagate through space charged region of base collector junction.
Symbol: τscr
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Base Collector Delay TimeOpen Variable
Base Transit Time
Base transit time is the average time the minority carriers need to traverse the quasi-neutral region in the base.
Symbol: τb
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Base Transit TimeOpen Variable
Emitter Charging Time
Emitter charging time is defined as drift in the motion of the charged particles induced by a field when you forward bias the emitter junction you get a large diffusion.
Symbol: τe
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Emitter Charging TimeOpen Variable

Other formulas in BJT Microwave Devices category

​Go Cut-off Frequency of Microwave
fco=12⋅π⋅τec
​Go Base Transit Time
τb=τec-(τscr+τc+τe)
​Go Base Collector Delay Time
τscr=τec-(τc+τb+τe)
​Go Maximum Frequency of Oscillations
fm=fT8⋅π⋅Rb⋅Cc

How to Evaluate Collector Charging Time?

Collector Charging Time evaluator uses Collector Charging Time = Emitter Collector Delay Time-(Base Collector Delay Time+Base Transit Time+Emitter Charging Time) to evaluate the Collector Charging Time, The collector charging time, also known as the storage time, refers to the time taken for the minority carriers in the base region of a bipolar junction transistor (BJT) to be swept out of the collector region after the transistor is turned off. Collector Charging Time is denoted by τc symbol.

How to evaluate Collector Charging Time using this online evaluator? To use this online evaluator for Collector Charging Time, enter Emitter Collector Delay Time (τec), Base Collector Delay Time (τscr), Base Transit Time (τb) & Emitter Charging Time (τe) and hit the calculate button.

FAQs on Collector Charging Time

What is the formula to find Collector Charging Time?
The formula of Collector Charging Time is expressed as Collector Charging Time = Emitter Collector Delay Time-(Base Collector Delay Time+Base Transit Time+Emitter Charging Time). Here is an example- 6.4E+6 = 0.005295-(5.5E-06+1.01E-05+0.005273).
How to calculate Collector Charging Time?
With Emitter Collector Delay Time (τec), Base Collector Delay Time (τscr), Base Transit Time (τb) & Emitter Charging Time (τe) we can find Collector Charging Time using the formula - Collector Charging Time = Emitter Collector Delay Time-(Base Collector Delay Time+Base Transit Time+Emitter Charging Time).
Can the Collector Charging Time be negative?
No, the Collector Charging Time, measured in Time cannot be negative.
Which unit is used to measure Collector Charging Time?
Collector Charging Time is usually measured using the Microsecond[μs] for Time. Second[μs], Millisecond[μs], Nanosecond[μs] are the few other units in which Collector Charging Time can be measured.
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