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Drain Current of Transistor Formula

GoInstantaneous Drain Current using Voltage between Drain and Source Formula

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Drain current below threshold voltage is defined as the subthreshold current and varies exponentially with gate to source voltage. Check FAQs

i d = \frac{V fc + V d}{R d}

i_d - Drain Current?V_fc - Fundamental Component Voltage?V_d - Total Instantaneous Drain Voltage?R_d - Drain Resistance?

Drain Current of Transistor Example

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Here is how the Drain Current of Transistor equation looks like with Values.

Here is how the Drain Current of Transistor equation looks like with Units.

Here is how the Drain Current of Transistor equation looks like.

17.4556 = \frac{5 + 1.284}{0.36}

17.4556mA = \frac{5V + 1.284V}{0.36kΩ}

17.4556 = \frac{5 + 1.284}{0.36}

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Drain Current of Transistor Solution

Follow our step by step solution on how to calculate Drain Current of Transistor?

FIRST Step Consider the formula

i d = \frac{V fc + V d}{R d}

Next Step Substitute values of Variables

∴

i d = \frac{5V + 1.284V}{0.36kΩ}

Next Step Convert Units

∴

i d = \frac{5V + 1.284V}{360Ω}

Next Step Prepare to Evaluate

∴

i d = \frac{5 + 1.284}{360}

Next Step Evaluate

∴

i d = 0.0174555555555556A

Next Step Convert to Output's Unit

∴

i d = 17.4555555555556mA

LAST Step Rounding Answer

∴

i d = 17.4556mA

Drain Current of Transistor Formula Elements

Variables

Drain Current

Drain current below threshold voltage is defined as the subthreshold current and varies exponentially with gate to source voltage.

Symbol: i_d

Measurement: Electric CurrentUnit: mA

Note: Value should be greater than 0.

Formulas to find Drain Current

Fundamental Component Voltage

Fundamental component voltage is the first harmonic of the voltage in the harmonic analysis of the square wave of voltage in an inverter based circuit.

Symbol: V_fc

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Fundamental Component Voltage

Total Instantaneous Drain Voltage

The total instantaneous drain voltage is the voltage that falls across the gate-source terminal of the transistor.

Symbol: V_d

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Total Instantaneous Drain Voltage

Drain Resistance

Drain resistance is the ratio of change in drain to source voltage to corresponding change in drain current for a constant gate to source voltage.

Symbol: R_d

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Drain Resistance

Other Formulas to find Drain Current

Go Instantaneous Drain Current using Voltage between Drain and Source

i d = K n \cdot (V ox - V t) \cdot V gs

Other formulas in Transistor Amplifier Characteristics category

Go Total Instantaneous Drain Voltage

V d = V fc - R d \cdot i d

Go Current Flowing through Induced Channel in Transistor given Oxide Voltage

i o = (μ e \cdot C ox \cdot (\frac{W c}{L}) \cdot (V ox - V t)) \cdot V ds

Go Current Entering Drain Terminal of MOSFET at Saturation

i ds = \frac{1}{2} \cdot k' n \cdot (\frac{W c}{L}) \cdot {(V ov)}^{2}

Go Input Voltage in Transistor

V fc = R d \cdot i d - V d

How to Evaluate Drain Current of Transistor?

Drain Current of Transistor evaluator uses Drain Current = (Fundamental Component Voltage+Total Instantaneous Drain Voltage)/Drain Resistance to evaluate the Drain Current, Drain Current of Transistor refers to the flow of current through the collector of a bipolar junction transistor, from the collector to the emitter. Drain Current is denoted by i_d symbol.

How to evaluate Drain Current of Transistor using this online evaluator? To use this online evaluator for Drain Current of Transistor, enter Fundamental Component Voltage (V_fc), Total Instantaneous Drain Voltage (V_d) & Drain Resistance (R_d) and hit the calculate button.

FAQs on Drain Current of Transistor

What is the formula to find Drain Current of Transistor?

The formula of Drain Current of Transistor is expressed as Drain Current = (Fundamental Component Voltage+Total Instantaneous Drain Voltage)/Drain Resistance. Here is an example- 17499.3 = (5+1.284)/360.

How to calculate Drain Current of Transistor?

With Fundamental Component Voltage (V_fc), Total Instantaneous Drain Voltage (V_d) & Drain Resistance (R_d) we can find Drain Current of Transistor using the formula - Drain Current = (Fundamental Component Voltage+Total Instantaneous Drain Voltage)/Drain Resistance.

What are the other ways to Calculate Drain Current?

Here are the different ways to Calculate Drain Current-

Drain Current=Transconductance Parameter*(Voltage across Oxide-Threshold Voltage)*Voltage between Gate and Source

Can the Drain Current of Transistor be negative?

No, the Drain Current of Transistor, measured in Electric Current cannot be negative.

Which unit is used to measure Drain Current of Transistor?

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

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Drain Current of Transistor Formula

​GoInstantaneous Drain Current using Voltage between Drain and Source Formula

Drain Current of Transistor Example

Drain Current of Transistor Solution

Drain Current of Transistor Formula Elements

Other Formulas to find Drain Current

Other formulas in Transistor Amplifier Characteristics category

How to Evaluate Drain Current of Transistor?

FAQs on Drain Current of Transistor

Variable Name

GoInstantaneous Drain Current using Voltage between Drain and Source Formula