Electronics Forum: tombstone 0402 layout (Page 1 of 20)

0402

Electronics Forum | Thu May 29 15:00:49 EDT 2008 | slthomas

We've found that reverse homeplate reduces tombstoning significantly for us on 0603 and 0402 (the latter of which we hardly ever see).

0402

Electronics Forum | Thu May 29 14:35:37 EDT 2008 | rdmundo

Gents, We've been using a round 1:1 aperture for a 5 mils thickness on our stencil design on 0402 and recently, IPC guidelines recommend oblong, homeplate or reverse homeplate. I believed the PCB pad for 0402's area within the recommended size/dimen

0402

Electronics Forum | Thu May 29 17:19:51 EDT 2008 | dyoungquist

On 0402s we use 20x25 mil pads with a 15 mil gap between the pads on the pcb with ENIG finish, 5 mil stencil with a 1:1 aperture (20x25 mil) and SAC305 lead free solder paste. We very rarely see any tombstoning on 0402s using this setup.

0201 pad layout

Electronics Forum | Fri Jan 06 13:47:15 EST 2012 | davef

Your starting [and finishing] point should be IPC-7351B Land Pattern Calculator and Tools - http://landpatterns.ipc.org/default.asp For more, look here: * http://www.smtnet.com/bob-willis/pbdai.html * http://www.onboard-technology.com/pdf_novembre

Decoupling caps and PCB layout

Electronics Forum | Wed Aug 10 02:38:36 EDT 2016 | zxcvb

I guess I've been somewhat ignorant when it comes to the finer details of pcb layout. Lately I've read a couple of books that try their best to lead me on the straight and narrow. Here is a couple of examples of a recent board of mine, and I have hig

0402 tombstones

Electronics Forum | Fri Apr 24 07:55:12 EDT 2009 | davef

TOMBSTONING OF 0402 AND 0201 COMPONENTS: "A STUDY EXAMINING THE EFFECTS OF VARIOUS PROCESS AND DESIGN PARAMETERS ON ULTRA-SMALL PASSIVE DEVICES" Michael Yuen, Heather Benedict, Kris Havlovitz, and Tim Pitsch, Plexus Electronic Assembly Corporation, N

0402 tombstones

Electronics Forum | Fri Apr 17 10:21:20 EDT 2009 | padawanlinuxero

have you try to change the stencil apertures to another figure like the one that look like a baseball home? I was having that problem and some solder beads and with that I was able to decrease the tombstones

0402 tombstones

Electronics Forum | Sat Apr 18 09:44:46 EDT 2009 | davef

Low tombstone pastes have been around for 8-10 years. Talk to your paste supplier about suggestions of the "latest and greatest." Usually these pastes: * Are a blend of alloys with slightly different melting points * Have a mid-level activity flux *

0402 tombstones

Electronics Forum | Sat Apr 18 17:42:07 EDT 2009 | billwestiet

I like this suggestion the best as a "band aid", check out some of the low tombstoning solder pastes. I've seen these work.

0402 tombstones

Electronics Forum | Tue Apr 21 16:33:06 EDT 2009 | llaerum

Home plate design is great for avoiding beads and tombstoning in some cases, but it will not help you when the spacing is too far apart. It will make it worse. You need a good even screen and accurate placement.

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