Trace Current Calculator

Trace Current Equation:

\[ I = k \times \Delta T^{0.44} \times (W \times Thick)^{0.725} \]

Constant (k):

unitless

Temperature Rise (ΔT):

°C

Width (W):

mils

Thickness (Thick):

mils

Trace Current (I):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Trace Current Equation?

The Trace Current equation estimates the maximum current a PCB trace can carry based on temperature rise, trace width, and thickness. It's essential for designing reliable printed circuit boards.

2. How Does the Calculator Work?

The calculator uses the Trace Current equation:

\[ I = k \times \Delta T^{0.44} \times (W \times Thick)^{0.725} \]

Where:

\( I \) — Trace current (amps)
\( k \) — Constant (typically 0.048)
\( \Delta T \) — Temperature rise (°C)
\( W \) — Trace width (mils)
\( Thick \) — Trace thickness (mils)

Explanation: The equation accounts for the relationship between current carrying capacity and temperature rise in PCB traces.

3. Importance of Trace Current Calculation

Details: Proper trace current calculation prevents overheating, ensures reliability, and maintains signal integrity in PCB designs.

4. Using the Calculator

Tips: Enter temperature rise in °C, width and thickness in mils (1 mil = 0.001 inch). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical value for k?
A: The standard value is 0.048 for external traces. For internal traces, use 0.024.

Q2: What's a safe temperature rise?
A: Typically 10-20°C is safe for most applications, but depends on your specific requirements.

Q3: How does trace thickness affect current?
A: Thicker traces can carry more current as they have lower resistance and better heat dissipation.

Q4: What units should I use?
A: The equation uses mils (1 mil = 0.001 inch) for width and thickness.

Q5: Are there limitations to this equation?
A: This is an empirical approximation. Actual performance may vary based on PCB material, copper purity, and environmental factors.