एंटेना लंबाई कैलकुलेटर — सूत्र

PCB Via Current Capacity

Approach

A via is a hollow copper cylinder. Its cross-section is:

A = pi x D x t_plating

Apply the IPC-2221 trace formula to this cross-section to estimate current capacity. For high current, use multiple vias in parallel.

हल किया गया उदाहरण

0.6 mm diameter via, 25 um plating, 1.6 mm board, 10C rise.

  1. Circumference = pi x 0.6 / 0.0254 = 74.2 mils
  2. Plating = 25 / 25.4 = 0.984 mils
  3. Area = 74.2 x 0.984 = 73.0 mils^2
  4. Current = 0.048 x 10^0.44 x 73^0.725 = ~2.8 A