PCB Creepage and Clearance Calculator

Creepage and Clearance Formulas:

\[ \text{Creepage} = 0.6 + 0.005 \times V_{\text{peak}} \] \[ \text{Clearance} = \text{Similar based on pollution degree} \]

Creepage (mm):

Clearance (mm):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is PCB Creepage and Clearance?

Definition: Creepage is the shortest distance between two conductive parts along the surface of insulation. Clearance is the shortest distance through air.

Purpose: These measurements ensure electrical safety and prevent arcing or short circuits in PCB designs.

2. How Does the Calculator Work?

The calculator uses these formulas:

\[ \text{Creepage} = 0.6\,\text{mm} + (0.005 \times V_{\text{peak}}) \] \[ \text{Clearance} = \text{Creepage} \times (1 + 0.2 \times \text{Pollution Degree}) \]

Where:

\( V_{\text{peak}} \) — Peak voltage between conductors
Pollution Degree — Environmental conditions (1-4)

Explanation: Higher voltages and worse environmental conditions require greater spacing between conductors.

3. Importance of Proper Spacing

Details: Correct creepage and clearance prevent electrical breakdown, reduce fire risk, and ensure compliance with safety standards like IPC-2221 and IEC 60950.

4. Using the Calculator

Tips: Enter the peak operating voltage and select the appropriate pollution degree for your environment.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between creepage and clearance?
A: Creepage is along the surface, clearance is through air. Clearance is typically smaller than creepage.

Q2: How do I determine pollution degree?
A: Degree 1 (clean), 2 (normal), 3 (industrial), 4 (heavy). Most commercial products use Degree 2.

Q3: Does this calculator work for AC and DC?
A: Yes, but always use peak voltage (for AC, this is √2 × RMS voltage).

Q4: What about high altitude applications?
A: At altitudes >2000m, clearance should be increased by 5% per 1000m.

Q5: Are there material considerations?
A: Yes, some materials have better tracking resistance allowing reduced creepage.