1. What is a PCB Clearance Calculator?

Definition: This calculator determines the minimum spacing between PCB traces needed to prevent arcing at a given peak voltage.

Purpose: It helps electronics designers ensure safe trace spacing to prevent electrical breakdown and short circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Spacing — Minimum clearance between traces (millimeters)
• V_peak — Peak voltage between traces (volts)

Explanation: The formula provides a conservative estimate for creepage distance based on IPC standards.

3. Importance of PCB Clearance Calculation

Details: Proper trace spacing prevents electrical arcing, improves reliability, and meets safety standards.

4. Using the Calculator

Tips: Enter the peak voltage between traces in volts. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula suitable for all applications?
A: This is a general guideline. High-altitude or high-humidity applications may require greater spacing.

Q2: Does this account for pollution degree?
A: No, this is a basic calculation. For harsh environments, additional margin should be added.

Q3: What about AC vs DC voltages?
A: Use peak voltage (for AC, this would be √2 × RMS voltage).

Q4: Is this spacing for internal or external layers?
A: This applies to external layers. Internal layers may require less spacing.

Q5: What standards is this based on?
A: The formula approximates IPC-2221 guidelines for basic insulation requirements.