1. What is the ANSI Trace Width Calculation?

The ANSI trace width calculation determines the minimum width of a PCB trace needed to safely carry a given current at a specified temperature rise. It helps prevent overheating and ensures reliable circuit operation.

2. How Does the Calculator Work?

The calculator uses the ANSI trace width formula:

Where:

• \( Current \) — Current in Amperes (A)
• \( Temperature \) — Temperature rise in degrees Celsius (°C)
• \( Width \) — Resulting trace width in mils (thousandths of an inch)

Explanation: The formula accounts for the relationship between current carrying capacity, temperature rise, and trace cross-sectional area.

3. Importance of Proper Trace Width

Details: Correct trace width is essential for preventing excessive temperature rise, voltage drop, and potential trace failure in PCB designs.

4. Using the Calculator

Tips: Enter current in Amperes and desired temperature rise in °C. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a mil in PCB measurements?
A: A mil is one thousandth of an inch (0.001 inch), the standard unit for PCB trace width measurements.

Q2: How does copper weight affect trace width?
A: Heavier copper (e.g., 2oz vs 1oz) can carry more current for the same width, or use narrower traces for the same current.

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

Q4: Are there other factors affecting trace width?
A: Yes, including ambient temperature, airflow, nearby traces, and PCB material thermal properties.

Q5: Should I add margin to the calculated width?
A: Yes, it's good practice to add 10-20% margin to the calculated width for safety and manufacturing tolerances.