Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Categories

Welcome to the new platform of Programmer's Heaven! We apologize for the inconvenience caused, if you visited us from a broken link of the previous version. The main reason to move to a new platform is to provide more effective and collaborative experience to you all. Please feel free to experience the new platform and use its exciting features. Contact us for any issue that you need to get clarified. We are more than happy to help you.

PCB Grid system origin

From the 1960s to the 1980s, the primary PCB design grid system used Imperial units. All PCB design features and grid layouts were in 0.001" (1 mil) increments and everything was symmetrical and evenly balanced. Then in 1988, the world standards organizations banded together to agree that the metric unit system was superior for solving PCB design development. The first signs of this transition started appearing in the 1990s in component manufacturers' datasheets and the JEDEC component packaging dimensional datasheets, which were once entirely based on Imperial inch units, where slowly converted to metric units.
Metric units appeared in the "PCB Design Grid System." However, this was met by great resistance in the U.S. Some American PCB designers, manufacturing companies, mechanical engineers and electrical engineers are still fighting the transition process.
The transition from one unit system to another introduced chaos into the PCB design industry because PCB designers were forced into using two different unit systems during the transition period. The CAD vendors' way of coping with the transition was to introduce a "gridless shape-based" autorouting feature that provided the PCB designer a solution for working with both metric and imperial unit pin pitched land patterns.

http://www.tsingyue.com
Sign In or Register to comment.