Electronics Forum | Wed Mar 09 19:51:28 EST 2005 | KT
Greetings: I would like to know the common land patterns and aperture shapes that are currently in use. We are doing some research on the same. Please respond to the thread if you have a success story with you current design. Thanks KT
Electronics Forum | Mon Apr 04 09:26:25 EDT 2005 | russ
Depends on a lot of things as suggested above but we solder land to land spacings of .02" (.5mm) with no shorting. Russ
Electronics Forum | Fri Apr 06 09:36:46 EDT 2007 | pjc
FYI: IPC-SM-782 has been superseded by IPC-7351A, IPC-SM-782 land patterns previously found under the "Manufacturer Part Number" database portion of SM-782 Land Pattern Calculator are no longer maintained by IPC.
Electronics Forum | Sat Feb 18 09:20:09 EST 2012 | davef
The 3-Tier PCB library concept was originally created by IEC (International Electromechanical Commission) in 1999 and introduced to IPC in 2000. The concept had to be created as a solution for high density packaging for hand held devices to ruggedize
Electronics Forum | Mon Dec 09 16:10:50 EST 2013 | davef
IPC-7351 Land Pattern Calculator and Tools [landpatterns.ipc.org/] Generic requirements for surface sount Design and Land Pattern Standards, is supplemented by a footprint expert software tool
Electronics Forum | Wed Jul 01 11:48:30 EDT 2015 | sssvajunas
We use component BFU730LX and we have one problem. After reflow transistor base or collector lands are not soldered. Maybe someone have similar problems with this component? We tryed to change stencil pads (smaller , bigger) but problem is the same.
Electronics Forum | Sat Oct 07 04:02:50 EDT 2000 | C.J. Long
Good morning, All: I am from PCB shop and one of our customer is experiencing solder bridge on 16 mil pitch QFP( immersion gold finish). Land width requirement is 8 +/- 1 mil measured over top of of land and our mean is 7 mil. Bottom land width is 8
Electronics Forum | Wed Apr 11 00:17:03 EDT 2001 | Dreamsniper
Hi, We got a 0.5mm pitch QFP144 from Altera with the below lead width specs. min. lead width = 0.17mm nominal = 0.22mm maximum = 0.27 What's the best pad or land width for the above? This is what our designer used. Land Width = Component Lead Wi
Electronics Forum | Tue Dec 28 15:35:21 EST 1999 | Mike Naddra
Edmund, An 0603 component should not fall from the board durring an inverted reflow pass, provided that: Your land geometries are correct for the package type (Start with SM 782 guidlines)- as surface tension of the liquidous solder is what holds
Electronics Forum | Tue Nov 30 15:38:27 EST 1999 | Wendy Casker
Hi, I am looking for land patterns for 0612 and 0508 chip capacitors. Because they are not standard (yet) package sizes, i am having trouble finding a standard land pattern. (If you don't know what these are, picture a 1206 or an 0805 with the te