I recall discussing DFM awhile back and it occurs to me that there is one additional area that belongs in the DF'X' family of Design Practice Criteria...
Design for Reliability... :)
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212
Fax: 760.918.8332
Mobile: 760.216.0170
E-mail: [log in to unmask]
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Brooks, William
Sent: Monday, September 15, 2014 10:00 AM
To: [log in to unmask]
Subject: Re: [DC] Vias
The webinar was from 2011 and covered both HDI solid plated holes in 100um and 200um thick materials for blind thru hole applications by Mark Lefebvre and High Aspect ratio thru hole plating using Periodic Pulse Reverse Plating By Dennis Yee. (I just watched it)
Screaming Circuits has a photo illustration of an example of what I was thinking about... http://screamingcircuits.typepad.com/.a/6a00d8341c008a53ef013484716f88970c-pi
I'm told that both Via systems and TTM can do solid copper filled vias and stacked microvias... Though I have not had any made for boards I have been working on yet. Don Carron did a great presentation for the Designers Council here in San Diego all about different types of vias and their applications and the processes to create them... and we talked a bit about this subject of solid copper vias... One of the concerns was that the solid copper CTE is very different from the surrounding epoxy glass and at some point the solid copper would really create stress in the board around the hole over thermal excursions from let's say -20C to +80C normal component operation temperature extremes... or especially during reflow soldering. So there are probably practical limits on your board thickness to get away with using this technology... What the limits are I am not sure...
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212
Fax: 760.918.8332
Mobile: 760.216.0170
E-mail: [log in to unmask]
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Brooks, William
Sent: Monday, September 15, 2014 8:02 AM
To: [log in to unmask]
Subject: Re: [DC] Vias
Copper plated filling of traditional thru holes vias is real... it is being done.
Please check Dow's website... nice webinar explains the process and chemical requirements.
http://storage.dow.com.edgesuite.net/flash_video/electronic_materials/4_27_11%20Webinar/files/default.html?contenttype=A&titlecolor=000000&eventid=291345&key=B619E6875E5601E4BC8415DD4C884730&text_language_id=en&sessionid=1&playerwidth=900&playerheight=675&helpcenter=false&format=wmaudio&mobile=false&flashsupportedmobiledevice=false&helpcenter=false
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212
Fax: 760.918.8332
Mobile: 760.216.0170
E-mail: [log in to unmask]
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of iTech iCollege iSrael ????? ?????????? ?????
Sent: Sunday, September 14, 2014 6:56 AM
To: [log in to unmask]
Subject: Re: [DC] Vias
Filled Vias can be made only for microVias, not traditional Vias which can be tented or covered
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Varughese, Renjith
Sent: Friday, September 12, 2014 4:58 AM
To: [log in to unmask]
Subject: Re: [DC] Vias
Hello Veronica,
Solid Copper filled vias you mentioned are about micro vias or traditional through hole vias?
Thanks and regards,
Renjith Varughese
Honeywell Honeywell Technology Solutions Lab Pvt. Ltd Adarsh Prime Project Pvt Ltd Survey No 19/2, Devarabisanahalli Village, K.R. Puram Hobli Bangalore East Taluk Bangalore - 560 103 Phone # - 26588360 Extn 50211
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Anderson, Veronika
Sent: Friday, September 12, 2014 4:28 AM
To: [log in to unmask]
Subject: Re: [DC] Vias
Bill,
Can you clarify your definition of "copper filled via"?
As far as I know, there is no via filling material that can be called a "copper fill".
As you mentioned, the thicker plating improves the thermal transfer and current carrying characteristics of via.
I've seen the drawings with a note "vias can be plated shut".
However, the conventional plating process cannot close the via completely - there is always an air gap in the middle.
The Reverse Pulse Plating Process provides the "solid copper plated via". So far only a few PWB manufacturers do that.
If you use a solid copper plated vias in your designs, please share a name of PCB manufacturer that builds your boards.
Regards,
Veronika Anderson C.I.D | Sr. Electrical/Mechanical Design Engineer | Excelitas Technologies
Office: +1 626.967.9521 x 236
1330 East Cypress Street, Covina, CA 91724 USA [log in to unmask] www.excelitas.com
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Brooks, William
Sent: Thursday, September 11, 2014 9:31 AM
To: [log in to unmask]
Subject: Re: [DC] Vias
Peter was talking with me about using vias in thermal pads and how some still leave an open aperture the size of the thermal pad for their solder paste...
This can cause the solder paste when it melts to be wicked down the via holes starving the part for solder... depending on the diameter of the vias and how many there are...
One method to reduce this effect is to change the stencil aperture to a pattern that avoids the vias and helps distribute the paste over the thermal pad area evenly...
See this illustration by Texas Instruments...
http://www.ti.com/ods/images/SNLS302D/sample_layout_DAP_snls302.png
Another thing that helps is to reduce the diameter of the via to reduce its wicking volume... smaller holes wick less...
I have used .008 in. diameter vias for that purpose before...
Or... you can have the via holes filled and planarized... thus no extra solder is wicked down the holes...
Partial filling tends to cause problems...
For example: Trapped gases will expand in the high heat of the reflow oven and cause solder balls to occur...
This is bad for your design when installed in the electronics application it typically must work in because solder balls are conductive and can cause shorts between pins and exposed pads or get loose in vibration and bounce around to other assemblies and cause the same sort of problems.
Also I have found that filling vias with solder does not improve their thermal transfer characteristics very much... Solder is not that great a heat conductor. Copper is the best thermal conductor typically for our PCB applications... so thicker copper plating in the holes or copper filled vias are bound to be far superior for thermal transfer reasons than filling the vias with solder.
William Brooks, CID+
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