PCB Via Current Calculator

Via Current Formula:

\[ I = 0.048 \times \Delta T^{0.44} \times \left(\pi \left(\frac{d}{2}\right)^2\right)^{0.75} \]

Current Capacity (I): A

Definition: This calculator estimates the current carrying capacity of a PCB via based on temperature rise and via diameter.

Purpose: It helps PCB designers ensure vias can safely carry required currents without excessive temperature rise.

The calculator uses the formula:

\[ I = 0.048 \times \Delta T^{0.44} \times \left(\pi \left(\frac{d}{2}\right)^2\right)^{0.75} \]

Where:

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

Details: Proper via current estimation prevents overheating, ensures signal integrity, and maintains PCB reliability.

Tips: Enter the desired temperature rise (default 10°C) and via diameter (default 0.3mm). All values must be > 0.

Q1: What's a typical safe temperature rise?
A: 10°C is common, but higher values (20-30°C) may be acceptable depending on application.

Q2: Does this account for plating thickness?
A: The formula assumes standard plating. For heavy copper, current capacity may be higher.

Q3: How does via length affect current?
A: This formula is length-independent for typical via aspect ratios.

Q4: What about multiple vias in parallel?
A: For n identical vias, multiply the result by n (assuming good thermal distribution).

Q5: Is this formula valid for all materials?
A: It's optimized for standard FR4. Other materials may require adjustment.