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MOSFET Subthreshold Swing (SS) & Off-State Leakage Current (I_off) Calculator

Easily calculate and compute mosfet subthreshold swing (ss) & off-state leakage current (i_off) calculator with accurate equations, live formulas, and expert guidance.

Operating temperature in Kelvin.

Space charge capacitance per unit area.

Gate oxide capacitance per unit area.

Nominal threshold voltage.

Drain current at V_GS = V_th.

Gate voltage when transistor is turned off (typically 0 V).

Calculated Result
67.8 mV/dec

Subthreshold Swing (SS)

Subthreshold Swing (SS)

67.8 mV/dec

Subthreshold Swing Mv Per Dec

67.8

Body Ideality Factor M

1.14

Theoretical Limit Mv Per Dec

59.5

Off State Leakage Current P A

0.2323

67.8 — mV/dec

Calculation Breakdown

  1. Applied FormulaCalculates the gate voltage swing needed to reduce off-state leakage drain current by one decade (order of magnitude) and determines static CMOS sleep power dissipation.SS = \frac{k_B T}{q} \ln(10) \left(1 + \frac{C_{dep}}{C_{ox}}\right), \quad I_{sub} = I_0 \exp\left(\frac{V_{GS}-V_{th}}{m V_t}\right)

MOSFET Subthreshold Swing Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.017345168Subthreshold Swing (SS)

What Is the MOSFET Subthreshold Swing (SS) & Off-State Leakage Current (I_off) Calculator?

This tool computes mosfet subthreshold swing (ss) & off-state leakage current (i_off) calculator with high precision arithmetic.

How Does the MOSFET Subthreshold Swing (SS) & Off-State Leakage Current (I_off) Calculator Work?

Calculates the gate voltage swing needed to reduce off-state leakage drain current by one decade (order of magnitude) and determines static CMOS sleep power dissipation.

MOSFET Subthreshold Swing (SS) & Off-State Leakage Current (I_off) Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

SS=kBTqln⁡(10)(1+CdepCox),Isub=I0exp⁡(VGS−VthmVt)SS = \frac{k_B T}{q} \ln(10) \left(1 + \frac{C_{dep}}{C_{ox}}\right), \quad I_{sub} = I_0 \exp\left(\frac{V_{GS}-V_{th}}{m V_t}\right)

Calculates the gate voltage swing needed to reduce off-state leakage drain current by one decade (order of magnitude) and determines static CMOS sleep power dissipation.

How to Use the MOSFET Subthreshold Swing (SS) & Off-State Leakage Current (I_off) Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

MOSFET Subthreshold Swing (SS) & Off-State Leakage Current (I_off) Calculator Example

Input Values:

temperatureKelvin:300
depletionCapacitanceCdepFfPerUm2:1.2
gateOxideCapacitanceCoxFfPerUm2:8.6
thresholdVoltageVth:0.45
onCurrentI0AtVthUa:1
gateToSourceOffVoltageVgs:0
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required mV/dec.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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