Electronics Forum | Thu Oct 25 21:33:24 EDT 2007 | hussman
Castellated is the easiest lead design. Anything longer than the out side dimension of the part should be OK. However, you will never get an inspection person to say it looks OK, yet the solder joint occurs on the bottom side of the part - like a B
Electronics Forum | Mon Sep 23 02:54:40 EDT 2013 | pradeep_selec
We are using Dpak package & I would like to know which is the best Aperture shape for DPAK, whether is there any problem if the Aperture of Ground pad is made of the same shape & size as the pad & what are the possible issues faced with it. Can I hav
Electronics Forum | Mon Sep 23 09:55:12 EDT 2013 | emeto
Hi, just for the package you have you will see 20 different designs for the ground pad. Some will be 1:1 with the part some will be 3 times bigger than the part ground contact. I would always print according to the part and will always do a windowpa
Electronics Forum | Tue Sep 24 10:09:52 EDT 2013 | leigh
Windowpane your ground planes, this will prevent a lot of voiding.
Electronics Forum | Fri Oct 11 16:25:43 EDT 2013 | scdunlap
Also coplanarity can be poor on these parts so overprinting the paste (beyond the pad perimeter) can increase volume to insure robust solder joint.
Electronics Forum | Fri Jul 06 04:55:59 EDT 2012 | ccgooi
I have fabricated a artwork of stencil on a mylar and make comparison on PCB and Stencil in order to confirm if there is any PCB stretching at both end. The results are comparable for both stencil and PCB without any stretching . So,I assumed that th
Electronics Forum | Thu Oct 30 15:36:18 EDT 2008 | grantp
Hi, Sounds like your engineer does not know what he's doing. We have developed and built hundreds of thousands of boards with normal square pads for 0402, and we just use a 5 thou stencil with 5% reduction and it works well. Decoupling? What is tha
Electronics Forum | Thu Oct 30 22:29:58 EDT 2008 | davef
For most applications, a nice square [or rectangle] pad works just fine. Assemblers ship boat loads of boards with these every day. It's reasonable for tight decoupling capacitor requirement applications to use round or radiused pads for components
Electronics Forum | Fri Jun 10 19:22:59 EDT 2022 | jdengler
Yes. We only do the side not under the component and do 25 mils if there is enough room. A solder preform is simply a block of solder that is shaped like a SMT component and comes in tape and reel. Most solder manufactures offer these. You can ta
Electronics Forum | Mon Jul 16 14:48:16 EDT 2001 | mparker
Just received "Circuits Assembly", July 2001 issue. An article regarding solder balls and aperture design, beginning on page 40. This DOE had aperture, reflow profile and no clean pastes (3 types) as attributes. It is advocated that a U-shaped a
