1. What is a PCB Via Current Calculator?

Definition: This calculator estimates the current carrying capacity of a PCB via according to IPC-2152 standards.

Purpose: Helps PCB designers determine appropriate via sizes to handle expected current loads without excessive temperature rise.

2. How Does the Calculator Work?

The calculator uses the IPC-2152 formula:

Where:

• \( I \) — Current capacity (Amperes)
• \( d \) — Via diameter (millimeters)
• \( \Delta T \) — Temperature rise above ambient (°C)

Explanation: The formula accounts for via geometry and acceptable temperature rise to determine safe current carrying capacity.

3. Importance of Via Current Calculation

Details: Proper via sizing ensures reliable PCB operation, prevents overheating, and meets IPC standards for current carrying capacity.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What temperature rise should I use?
A: Typical values are 10-20°C. Higher values allow more current but increase operating temperature.

Q2: Does this account for via plating thickness?
A: The IPC-2152 formula assumes standard plating. For non-standard plating, consult additional resources.

Q3: How does via length affect the calculation?
A: The standard formula assumes typical PCB thickness. For very thick boards, additional derating may be needed.

Q4: Can I use this for multiple vias in parallel?
A: For parallel vias, multiply the result by the number of vias, but consider current sharing may not be perfectly even.

Q5: What's the minimum via diameter this applies to?
A: The formula is valid for typical via sizes (0.2mm to 0.5mm diameter). For microvias, consult specialized data.