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Saturation Current Formula

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Saturation current is the diode leakage current density in the absence of light. It is an important parameter which differentiates one diode from another. Check FAQs

i sat = \frac{A be \cdot [Charge-e] \cdot D n \cdot n po}{w b}

i_sat - Saturation Current?A_be - Base Emitter Area?D_n - Electron Diffusivity?n_po - Thermal Equilibrium Concentration?w_b - Base Junction Width?[Charge-e] - Charge of electron?

Saturation Current Example

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Here is how the Saturation Current equation looks like with Values.

Here is how the Saturation Current equation looks like with Units.

Here is how the Saturation Current equation looks like.

1.8095 = \frac{0.12 \cdot 1.6E-19 \cdot 0.8 \cdot 1E+15}{0.0085}

1.8095mA = \frac{0.12cm² \cdot 1.6E-19C \cdot 0.8cm²/s \cdot 1E+151/cm³}{0.0085cm}

1.8095 = \frac{0.12 \cdot 1.6E-19 \cdot 0.8 \cdot 1E+15}{0.0085}

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Saturation Current Solution

Follow our step by step solution on how to calculate Saturation Current?

FIRST Step Consider the formula

i sat = \frac{A be \cdot [Charge-e] \cdot D n \cdot n po}{w b}

Next Step Substitute values of Variables

∴

i sat = \frac{0.12cm² \cdot [Charge-e] \cdot 0.8cm²/s \cdot 1E+151/cm³}{0.0085cm}

Next Step Substitute values of Constants

∴

i sat = \frac{0.12cm² \cdot 1.6E-19C \cdot 0.8cm²/s \cdot 1E+151/cm³}{0.0085cm}

Next Step Convert Units

∴

i sat = \frac{1.2E-5m² \cdot 1.6E-19C \cdot 8E-5m²/s \cdot 1E+211/m³}{8.5E-5m}

Next Step Prepare to Evaluate

∴

i sat = \frac{1.2E-5 \cdot 1.6E-19 \cdot 8E-5 \cdot 1E+21}{8.5E-5}

Next Step Evaluate

∴

i sat = 0.00180951712376471A

Next Step Convert to Output's Unit

∴

i sat = 1.80951712376471mA

LAST Step Rounding Answer

∴

i sat = 1.8095mA

Saturation Current Formula Elements

Variables

Constants

Saturation Current

Saturation current is the diode leakage current density in the absence of light. It is an important parameter which differentiates one diode from another.

Symbol: i_sat

Measurement: Electric CurrentUnit: mA

Note: Value should be greater than 0.

Formulas to find Saturation Current

Base Emitter Area

Base Emitter Area is defined as the cross-sectional area of the base emitter junction in an amplifier.

Symbol: A_be

Measurement: AreaUnit: cm²

Note: Value should be greater than 0.

Formulas to find Base Emitter Area

Electron Diffusivity

Electron Diffusivity is the diffusion current is a current in a semiconductor caused by the diffusion of charge carriers (holes and/or electrons).

Symbol: D_n

Measurement: DiffusivityUnit: cm²/s

Note: Value should be greater than 0.

Formulas to find Electron Diffusivity

Thermal Equilibrium Concentration

Thermal Equilibrium Concentration is defined as the concentration of carriers in an amplifier.

Symbol: n_po

Measurement: Carrier ConcentrationUnit: 1/cm³

Note: Value should be greater than 0.

Formulas to find Thermal Equilibrium Concentration

Base Junction Width

Base Junction Width is the parameter which signifies how wide is the base junction of any analog electronics element.

Symbol: w_b

Measurement: LengthUnit: cm

Note: Value should be greater than 0.

Formulas to find Base Junction Width

Charge of electron

Charge of electron is a fundamental physical constant, representing the electric charge carried by an electron, which is the elementary particle with a negative electric charge.

Symbol: [Charge-e]

Value: 1.60217662E-19 C

Other formulas in Amplifier Characteristics category

Go Power Gain of Amplifier

A p = \frac{P L}{P in}

Go Current Gain of Amplifier

A i = \frac{I o}{i in}

Go Base Junction Width of Amplifier

w b = \frac{A be \cdot [Charge-e] \cdot D n \cdot n po}{i sat}

Go Differential Voltage in Amplifier

V id = \frac{V o}{(\frac{R 4}{R 3}) \cdot (1 + \frac{R 2}{R 1})}

How to Evaluate Saturation Current?

Saturation Current evaluator uses Saturation Current = (Base Emitter Area*[Charge-e]*Electron Diffusivity*Thermal Equilibrium Concentration)/Base Junction Width to evaluate the Saturation Current, The Saturation current for a BJT is the point where a further increase in base current will not result in a corresponding increase in collector current. Saturation Current is denoted by i_sat symbol.

How to evaluate Saturation Current using this online evaluator? To use this online evaluator for Saturation Current, enter Base Emitter Area (A_be), Electron Diffusivity (D_n), Thermal Equilibrium Concentration (n_po) & Base Junction Width (w_b) and hit the calculate button.

FAQs on Saturation Current

What is the formula to find Saturation Current?

The formula of Saturation Current is expressed as Saturation Current = (Base Emitter Area*[Charge-e]*Electron Diffusivity*Thermal Equilibrium Concentration)/Base Junction Width. Here is an example- 1809.517 = (0.12*[Charge-e]*8E-05*1E+15)/8.5E-05.

How to calculate Saturation Current?

With Base Emitter Area (A_be), Electron Diffusivity (D_n), Thermal Equilibrium Concentration (n_po) & Base Junction Width (w_b) we can find Saturation Current using the formula - Saturation Current = (Base Emitter Area*[Charge-e]*Electron Diffusivity*Thermal Equilibrium Concentration)/Base Junction Width. This formula also uses Charge of electron constant(s).

Can the Saturation Current be negative?

No, the Saturation Current, measured in Electric Current cannot be negative.

Which unit is used to measure Saturation Current?

Saturation Current is usually measured using the Milliampere[mA] for Electric Current. Ampere[mA], Microampere[mA], Centiampere[mA] are the few other units in which Saturation Current can be measured.

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Saturation Current Formula

Saturation Current Example

Saturation Current Solution

Saturation Current Formula Elements

Other formulas in Amplifier Characteristics category

How to Evaluate Saturation Current?

FAQs on Saturation Current

Variable Name