1. What is Trace Width Calculation?

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

2. How Does the Calculator Work?

The calculator uses the trace width formula:

Where:

• \( w \) — Trace width (units)
• \( i \) — Current (A)
• \( k \) — Material constant (typically 0.024 for inner layers, 0.048 for outer layers)
• \( \Delta t \) — Temperature rise (°C)

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

3. Importance of Trace Width Calculation

Details: Proper trace width calculation prevents overheating, ensures signal integrity, and maintains reliability in PCB designs. Incorrect trace widths can lead to thermal failure or excessive voltage drop.

4. Using the Calculator

Tips: Enter current in amperes, the material constant (k), and desired temperature rise. Typical k values are 0.024 for inner layers and 0.048 for outer layers.

5. Frequently Asked Questions (FAQ)

Q1: What are typical k values?
A: Common values are 0.024 for inner layers and 0.048 for outer layers, but check your PCB manufacturer's specifications.

Q2: What temperature rise is acceptable?
A: Typically 10-20°C is acceptable for most applications, but depends on your design requirements.

Q3: Does this account for copper thickness?
A: The k factor indirectly accounts for copper thickness (1 oz/ft² is typical).

Q4: What units does the result use?
A: The result is in the same units as used in the k constant (typically mils or mm).

Q5: When should I use this calculation?
A: For all power traces and high-current signal traces in your PCB design.