TOOLS / Devices

PN Junction Depletion Analyzer

A browser-local PN Junction Depletion Analyzer for electronic-information study and early engineering checks.

Browser-local calculationDepletion approximation

Quick guide

How to use “PN Junction Depletion Analyzer”

3-step guide +

Enter parametersProvide values, units, or local files using the field guidance.
CalculateClick Calculate to see key values, formulas, units, and model notes.
Check limitsReview assumptions and limits before using the estimate in a real design.

Input

Parameters

Doping conditions

Acceptor concentration NA

m⁻³

Enter a valid acceptor concentration na in m⁻³. Check the result notes for model assumptions and limits.

Donor concentration ND

m⁻³

Enter a valid donor concentration nd in m⁻³. Check the result notes for model assumptions and limits.

Intrinsic concentration ni

m⁻³

Enter a valid intrinsic concentration ni in m⁻³. Check the result notes for model assumptions and limits.

MaterialParameters

Temperature T

Enter a valid temperature t in K. Check the result notes for model assumptions and limits.

Relative permittivity εr

Enter a valid relative permittivity εr. Check the result notes for model assumptions and limits.

Bandgap Eg

Enter a valid bandgap eg in eV. Check the result notes for model assumptions and limits.

Bias conditions

Applied voltage VA

Enter a valid applied voltage va in V. Check the result notes for model assumptions and limits.

Output

Calculation result

Loading this tool…

Results will appear here.

Depletion-layer conclusionAbrupt homojunction PN junction

Built-in potential Vbi: —
Depletion width W: —
Peak electric field Emax: —

Effective depletion potential Vdep: —
P-side width xp: —
N-side width xn: —
Thermal voltage VT: —
P-side charge density Qp: —
N-side charge density Qn: —
Relative charge-balance error: —
Band bending: —
Fermi-level note: —

Band profileDepletion approximation reference

Conduction band ECValence band EV

Boundary and junction summary
Position	x	ψ	E	EC	EV	EF

Local actions

Calculated in this browser; parameters are not uploaded.

More actions

Knowledge recall

Concept notes

NOTE

Concepts, relationships, and engineering limits.

01 / 30-second recall

PN Junction Depletion Analyzer uses the Depletion approximation model to connect the entered parameters with a practical engineering quantity. The result is a local estimate, not a measurement.

02 / Core relationship

Use the displayed Depletion approximation relationship with consistent SI units. Keep the formula, unit conversion, and sign convention together when checking the result.

03 / When to use

Enter the values you actually know, calculate, and then compare the result with the expected range, component limits, and the operating conditions of your design.

Common pitfalls

Do not treat a nominal value or a first-order model as proof that a real circuit will meet its tolerance, stability, thermal, timing, or signal-integrity requirements.

Engineering note

Use this result for learning and early planning. Confirm the final design with the relevant datasheet, simulation, measurement, layout review, and worst-case conditions.

FormulaCalculation basis

Use the displayed Depletion approximation relationship with consistent SI units. Keep the formula, unit conversion, and sign convention together when checking the result.

LimitsAssumptions & limits

Use this result for learning and early planning. Confirm the final design with the relevant datasheet, simulation, measurement, layout review, and worst-case conditions.