SMT footprint information
SMT footprint information
(OP)
Hi,
I am doing some PCB design, and I have found that the information on the dimensions of various SMT footprints is quite lacking on the Web. Is there a source somewhere of footprint drawings with dimensions of the pads + spacings, so that I can design them in my CAD package?
Thanks
Dave
I am doing some PCB design, and I have found that the information on the dimensions of various SMT footprints is quite lacking on the Web. Is there a source somewhere of footprint drawings with dimensions of the pads + spacings, so that I can design them in my CAD package?
Thanks
Dave





RE: SMT footprint information
The CAD program should also have a library of many of the more standard component footprints.
RE: SMT footprint information
RE: SMT footprint information
Footprints from the document above are good for general SMT assembly where a board does not push the limits of SMT density, use less common packages, use fine pitch devices, use a high mix of different components, use unusual board materials, experience high thermal cycling extremes, or less common assembly processes.
However, the document does not cover all the available packages and is only a starting point for a PCB designer when dealing with a new or novel package. Additionally, many contract manufacturers have their own footprint libraries that they have optimized for their processes.
When you get into issues with fine pitch devices, BGA devices, flip-chip, and the like - then you get into the area where process engineers and PCB designers publish books and present papers at conferences.
But for 0603 passive/SO type ICs and larger devices on boards produced in low volumes even an general footprint is fine.
RE: SMT footprint information
http://www.pcblibraries.com
Somewhere along the way I came across a site where a member posted his entire collection of SMD land data in PDF form. I want to say it was on the PCBStandards.com forum, but I can't say for sure.
Dan
Owner
http://www.Hi-TecDesigns.com
RE: SMT footprint information
Dave