Eric,
We at Cookson Electronics PC Fab Ltd (there is a facility in Livingston,
just down the road from you - telephone 01506 412812), produce Polyclad
laminates rigid FR4 down to 0.8mm (0.032") double sided copper clad.
Anything less than this thickness, we then produce as thin core laminates,
which are generally used in the construction of multilayer PCB's. We can
produce a laminate thickness down to 0.05mm (0.002") double sided.
I have, however on my travels across the UK, seen PCB fabricators using
much thinner laminates for double sided PCB applications.
There are a number of factors to consider when deciding to use thinner
materials for "rigid" applications.
1. Flex and bend is increased, due to the reduced thickness, so don't try
and mount heavy components onto a large PCB, and expect it to lay flat on
posts in a box. This effect will reduce, the smaller the PCB.
2. The dielectric (insulation) spacing between the copper layers is
obviously decreased also, so take this into account if a controlled
impedance is required.
3. If mounting conventional components, then care should be taken, as the
amount of support provided down through the hole is less than that on
standard 1.6mm rigid laminate.
4. If wave machine soldering, then faster conveyor speeds will have to be
used, as the heat input into the material and transfer from side 1 to 2 is
quicker.
I would be happy to discuss any issues you have on the above, if you care
to contact me off-line.
My telephone number is 0468 945679
Regards,
Colin McVean
Technical Services (UK)
Cookson Electronics PC FAB Ltd
At 11:28 22/04/99 -0500, you wrote:
>I want to use a rigid PCB in an extremely small device. The thickness of
FR4 is
>too great to allow it's use. What else is commercially available (ie cheap
and
>available in quantity) that's thinner and how thin can I get?
>
>Regards,
>
>
>
>Eric Christison
>Mechanical Engineer
>VLSI Vision Ltd
>Aviation House
>31 Pinkhill
>Edinburgh
>EH12 7BF
>
>Tel: +44 (0) 131 539 8165
>Fax: +44 (0) 131 539 7141
>A company of the STMicroelectronics Group
>
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