Electronics Forum: pad design 1

BGA ball and PCB pad

Electronics Forum | Fri Feb 13 11:46:23 EST 2004 | Jack

Is your customer trying to reduce voiding? If the device is using Sn90 / Pb10 and the paste is Sn63/Pb37 the board will melt first. However, if both solders are 183C eutectic, it's a tossup? PCB design, copper weight, bga type (pbga, micro bga, Tbg

Re: SMD/PTH Tantalum pad layout

Electronics Forum | Tue Feb 02 10:56:53 EST 1999 | Justin Medernach

| Would anyone have experience or information on where I could find pad geometry for tantalum capacitors that can be surface or plated thru hole mounted. | Yup, Check out IPC-782. That's got all the info on land geometries that you'd be looking f

Voiding in CSP Ground pad

Electronics Forum | Fri Feb 07 15:17:14 EST 2003 | MA/NY DDave

Hi I am pretty sure it isn't the pad that is causing the problem. To me it seems like those via holes through the pcb either to an internal plane or to the other side. I can imagine creating an interesting stencil to accomodate the vias yet you are

Defect reduction on RF design

Electronics Forum | Mon Sep 19 09:02:10 EDT 2005 | clampron

Good Morning Everyone, We have a customer that produces RF based assemblies. We are building several board types for them, all of which have an "RF" area of the PCB. This RF area does not have any mask to define pads. There are also several issues w

Defect reduction on RF design

Electronics Forum | Wed Sep 21 04:53:13 EDT 2005 | Slaine

go beat the designer over the head until he separates the pads or uses solder mask.

Defect reduction on RF design

Electronics Forum | Tue Sep 20 23:12:38 EDT 2005 | darby

Several suggestions. Your hands may be tied but here goes. 1. Doctor your stencil so that pads are not shared etc and reduce the apertures more that what you would normally. This may stop one pad wetting into another etc. 2. The use of a Pb-free sol

how to learn PCB design

Electronics Forum | Mon Jan 21 06:58:41 EST 2019 | kiransahu

Without PCB layout, not much would get done. It is a ubiquitous need across industries; Industrial, consumer, military...Everywhere you look, there are chips soldered to PCBs to create a final product for the end customer. But where did we all learn

via under a smd pad ?

Electronics Forum | Wed Nov 21 15:02:46 EST 2007 | jlawson

From info I have been told from design standpoint, via in pads helps with managing EMC issues with working design, in particular for high speed digital/dense populated type PCB's. We had a manufacturing customer that had very low yield because of th

smt common pad 0402 and 1206 package

Electronics Forum | Fri May 06 06:51:55 EDT 2016 | abhilash4788

Hi All, One of my customer has provided a pcb design having common pad for 0402 and 1206 package(i.e 3 pads in the gerber, pad1,pad2 belongs to 1206 package and pad2,pad3 belongs to 0402 package) Will this create any solderability issue. Is anyone e

via under a smd pad ?

Electronics Forum | Wed Nov 14 14:44:10 EST 2007 | grantp

Hi, Those via's sure do sound large, and I think the designer must have made a mistake in the PCB design do you think? From looking at our PCB designs, if we moved to via in pad, it would really reduce the size of the PCB, so this is an important i


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