Automating IPC-2581 Dielectric Stack-Up Verification during Secondary Factory Bring-Up
Automating IPC-2581 stack-up parsing aligns secondary factory laminate inventory with signal integrity targets, eliminating manual engineering delays and scrap.
Trace Width Compensation
Meaning
Adjustment of conductor widths in a layout accounts for material loss during the chemical etching process. Applying trace width compensation ensures that features match the design.
Etch Correction
Chemical baths used to remove unwanted copper also attack the sides of the traces being formed. The amount of trace width compensation needed depends on the thickness of the copper foil. Thicker copper requires more compensation because it spends more time in the etching solution.
These solutions are monitored to ensure consistent results across different batches.
Dimensional Accuracy
Final impedance and current-carrying capacity of a trace are determined by its finished width. Without trace width compensation the conductors would be too narrow, leading to higher resistance and potential signal errors. This is particularly important for fine-pitch designs where the margins are very small.
Precise control here ensures the electrical performance of the connectivity module.
Production Yield
Increasing the reliability of the manufacturing process reduces the number of rejected boards. Proper trace width compensation prevents traces from becoming so thin that they break or lift from the substrate. This improves the overall yield of the production run.
It also ensures that the solder mask can be accurately aligned over the copper features.