Regarding castellation boards, Cosmotronic mentioned earlier does a very nice job (I worked for those good folks for years) and also down the street 30 minutes Speedy does a nice job (I understand Vermont is very nice however I have never worked with them), the other guys who have very nice display including this is Eltek. I fully agree with diamond saw method and have gone that route (or rout). It is, as always, about volume and if has substantial volume find another way as this straight forward method has poor yield that is wrapped into price.
A defeating scenario is low pitch. At .050 we had discussions on design configuration, at .025 the discussion become quite a bit shorter and if you are at sub .020 pitch you have extremely limited choice. Meaning the saw edge travel is a straight line and in a small diameter hole the tolerance of travel location is critical lending itself to to little PTH left and or empty sites. Get a quote, it should tell all.
My advice, don't build your Castle-ation on a sand foundation.... TGIF
BB
----- Original Message -----
From: Steven Creswick<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Thursday, September 16, 2010 8:03 PM
Subject: Re: [TN] looking for castellation board vendor recommendation
Richard,
Can not recommend a specific supplier either, however would recommend that
you diamond saw the boards to singulate rather than score and break, etc.
Most hybrid mfrs that deal with ceramics, or dicing of wafers can easily saw
generic laminates, leaving the module with mirror smooth edges and little
tearing, smearing of the castellation metallization. Amounts to selection
of blade, feed and speed. Have diced boards ranging from 0.010-0.062" thick
using this method.
Since your have a single-sided board, one would just attach the board to a
sacrificial plate [glass for example] with a water soluble wax after
assembly. Problems will surface if the board is warped, or tall components
are near the edges where the hub of the dicing blade may hit.
Getting the board is the easy task. Am sure that you can find a facility
somewhere nearby that can dice them for you...
Steve Creswick
http://www.linkedin.com/in/stevencreswick<http://www.linkedin.com/in/stevencreswick>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Hatano
Sent: Tuesday, September 07, 2010 1:57 PM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: [TN] looking for castellation board vendor recommendation
Hello Everyone,
It's been a few years since I've been on TechNet, and it's good to see some
familiar names. I hope you're all doing well in these difficult times.
I know my question begs more questions, but I would like to hopefully keep
it simple by asking if anyone can recommend a pcb fab company to get some
boards with castellated edges made.
Right now these are prototype and I don't know what the quantity will
eventually be. Other than the castellation there is nothing strange about
them. They are less than 1 sq. in. in area, 4 layer, SMD one side, 6/6 mil
trace/space, 14 mil via. Having thinner boards (0.031") would be preferred
but seems to really impact cost, so it is a secondary parameter.
If anyone can reply with a recommendation it would be hugely appreciated.
Thanks,
Richard
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