PCB Libraries' Relationship with IPC and Role in the Industry
IPC and PCB Libraries have worked together since the development of the three tiered land pattern convention established by the committee of the International Electrotechnical Commission. The concepts were adopted by the IPC and its land pattern committee and the mathematical model documented in the standard provides a common ground for the physical land pattern dimensions. The mathematical equations and resulting patterns were jointly developed by the IPC committee and PCB Libraries.

The model uses the dimensions of the components produced by the industry which at times vary from what is published for component dimensional properties. This data has been used to develop the appropriate land pattern for different parts with the three options related to equipment density.

The IPC standard supported by the PCB libraries calculator establishes a naming convention that includes identification of the size, shape and configuration of the recommended land pattern. Developing or using alternate parameters for these characteristics with an identical or similar name is not in the best interest of the industry and is discouraged.

A number of organizations* had an effect on the product development at PCB Libraries, including:

American National Standards Institute (ANSI)		Electronic Industries Alliance (EIA)
International Electrotechnical Commission (IEC)		IPC - Association Connecting Electronics Industries
Joint Electron Device Engineering Council (JEDEC)		Mentor Graphics
National Electronics Manufacturing Initiative (NEMI)		National Institute of Standards and Technology (NIST)

* Please note that these organizations have not necessarily formally approved PCB Libraries products. Our work is a compilation of work based on standards of these organizations and we recommend that you also purchase their standards for your own reference. Any identified discrepancy between the data presented in the published standards and our PCBL data will be addressed immediately.