1. What is the AS 3000 Standard for PCB Traces?

The AS 3000 standard provides guidelines for maximum current carrying capacity of PCB traces based on width and temperature rise. It ensures safe operation and prevents overheating in electrical installations.

2. How Does the Calculator Work?

The calculator uses the AS 3000 equation:

Where:

• \( I \) — Maximum current (A)
• \( k \) — Material constant (0.048 for standard copper)
• \( A \) — Cross-sectional area (derived from width)
• \( B \) — Exponent for area (0.44)
• \( T \) — Temperature rise (°C)
• \( C \) — Exponent for temperature (0.725)

Explanation: The equation accounts for the relationship between trace width, temperature rise, and current carrying capacity.

3. Importance of Trace Current Calculation

Details: Proper trace sizing is crucial for PCB reliability, preventing overheating, and ensuring long-term operation of electronic devices.

4. Using the Calculator

Tips: Enter trace width in millimeters and desired temperature rise in °C. Typical values are 10-50°C temperature rise for standard applications.

5. Frequently Asked Questions (FAQ)

Q1: What copper weight does this assume?
A: The standard calculation assumes 1 oz/ft² (35 µm) copper thickness.

Q2: How does ambient temperature affect this?
A: The temperature rise is above ambient. Ensure total temperature (ambient + rise) doesn't exceed material limits.

Q3: What about multi-layer boards?
A: Internal traces may have different current capacity due to different cooling conditions.

Q4: Are there safety margins built in?
A: The standard includes some safety margin, but additional derating may be needed for critical applications.

Q5: How accurate is this calculation?
A: It provides a good estimate but actual performance depends on board material, nearby traces, and airflow.