Electronics Forum: pad width (Page 1 of 18)

Conductor width tolerances

Electronics Forum | Tue Nov 09 05:14:49 EST 1999 | Wolfgang Busko

Hi all, our problem we face is the mismatch of conductor width on the delivered PCB and the nominal width given by CAD-data. With CAD we are improving pads and conductors to match the specific needs for soldering and the board houses counteract our i

0402 pad designs???

Electronics Forum | Tue Jun 24 12:56:26 EDT 2014 | jmathis

Hello, As our company has begun doing an increase production of contract manufacturing I have seen more and more designs with the 0402 pad layouts that are smaller (.015 in width) than the component. Also there is only a .008 longer than the 0402 p

0306 pad design

Electronics Forum | Fri Dec 20 10:13:38 EST 2002 | davef

The total inductance of a chip capacitor is determined both by its length to width ratio and by the mutual inductance coupling between its electrodes. So, a 1210 chip size has a lower inductance than a 1206 chip. Check with your supplier for recomm

Land size

Electronics Forum | Wed Jul 09 10:15:57 EDT 2008 | aj

I have carried out some further measurements on the device and the results are as follow: Component Lead width measures 183 microns. Actuals PAD width measures 158 microns. What I am thinking is that the lead is attracting the solder hence prevent

Film Capacitors - Tombstoning or Drawbridging Problems

Electronics Forum | Wed Mar 25 14:46:16 EST 1998 | David Spilker

We are having some problems with "drawbridging" on 0805 film capacitors. We have already reduced the pad width from .050" to .040" based on input from vendor. Defects appear to be random as far as location on the PWB and direction of placement. We

Land pattern design

Electronics Forum | Tue Oct 30 19:42:44 EST 2001 | davef

Jim Blankenhorn [www.smtplus.com] has the best understanding of designing pads for real life. That�s because he designs them like he wants to design them and doesn�t negotiate with a committee of thousands for an IPC standard. Consider doing this

Solder bridges on TQFP 100 part

Electronics Forum | Wed Aug 07 12:41:58 EDT 2019 | slthomas

Are the apertures on the stencil reduced in width or 1:1 with the pads? It depends on the pad width and foil thickness but we usually reduce aperture width for any part that results in an aperture wall spacing of less than 8.5 mils.

Fine Pitch Pad Width Size VS Component Lead Width

Electronics Forum | Wed Apr 11 06:06:53 EDT 2001 | wbu

Hi Dreamsniper, the IPC land design standard is IMO a good reference. If you use the online calculator you can influence the result by varying for example manufactoring parameters. For the same lead width and same tolerances (and of course pitch) we

Solder joint strength

Electronics Forum | Wed Mar 30 16:07:24 EST 2005 | Dreamsniper

If there's no shear strength standard for solder joint, how will I define my pad width and length then. I have a 8.5 mils width and my component lead width is 8.66 mils based on manufacturer's minimum width specification. How will I identify that it

Undersized Land Width from PCB Fab - Help!

Electronics Forum | Tue Nov 09 12:00:41 EST 2004 | Dreamsniper

Problem: PQFP208 Pad Width specified as 11.8 thou, PCB came and they are 9.5 thou. Component Lead Width is 10 thou to 10.6 thou. Operators have difficulty aligning and inspecting. Issue: Fed back to PCB Fab House and they said IPC accepts +/- 20% fo

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