1. What is Trace Width Calculation?

The trace width calculation determines the appropriate width of a PCB trace needed to safely carry a specified current without exceeding temperature limits. It's essential for reliable PCB design and preventing overheating.

2. How Does the Calculator Work?

The calculator uses the trace width formula:

Where:

• \( Current \) — Current in amperes (A)
• \( k \) — Constant (typically 0.024 for outer layers, 0.048 for inner layers)
• \( Temp \) — Temperature rise in degrees Celsius (°C)

Explanation: The formula accounts for the non-linear relationship between current carrying capacity and temperature rise in PCB traces.

3. Importance of Trace Width

Details: Proper trace width calculation prevents overheating, ensures signal integrity, and maintains PCB reliability. Undersized traces can lead to excessive temperature rise and potential failure.

4. Using the Calculator

Tips: Enter current in amperes, appropriate k constant (0.024 for external traces, 0.048 for internal), and desired maximum temperature rise. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between internal and external trace calculations?
A: External traces (on outer layers) can dissipate heat better, hence the different k constant. Internal traces require more width for the same current.

Q2: How accurate is this calculation?
A: It provides a good estimate but actual performance depends on PCB material, copper weight, and surrounding environment.

Q3: What's a typical temperature rise limit?
A: Common limits are 10°C or 20°C, but this depends on your application requirements.

Q4: Does copper thickness affect the calculation?
A: Yes, the k constant varies with copper weight (thickness). The default values are for 1 oz/ft² copper.

Q5: Can this be used for high-current applications?
A: For very high currents, consider using multiple parallel traces or copper pours instead of extremely wide traces.