From: "Roger Hamlett"
Subject: Re: How thick is the copper on PCB's
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Date: Fri, 20 Dec 2002 09:47:25 -0000
NNTP-Posting-Date: Fri, 20 Dec 2002 09:49:07 GMT
Organization: ntl Cablemodem News Service
"Alan" wrote in message
> On Thu, 19 Dec 2002 17:23:25 -0800, "Harry Dellamano"
> >"Boris Mohar" wrote in message
> >> On Thu, 19 Dec 2002 11:52:04 GMT, Steve Drake
> >> wrote:
> >> >Hi, I was just wondering how this is the copper on
> >> >standard 1oz,2oz copper PCB's. I seem to remember
> >> >that the most common PCB material is about 62 thou.
> >> >but I can't find information on how thick the copper
> >> >layer is. I have looked and the data sheets I did see
> >> >talk about diaelectric constant, stability etc. but
> >> >nothing saying how thick the copper is on the PCB.
> >> >Could anyone tell me where I can find that information,
> >> >or is there some way to calculate it off a data sheet.
> >> >
> >> >Thank you for any information or help you can send
> >> >my way.
> >> >
> >> >Regards,
> >> >
> >> >Steve Drake
> >> 1oz is about 0.0014"
> >> Boris Mohar
> > Arr.. Finally we get some good info with real units!
> > harry
> 1oz copper is 0.035mm thick or 0.014inch (14mil/thou)
> surprisingly 2oz copper is twice as thick!
It is also worth adding a 'caveat' here. If (for instance), you specify a
board with 1oz copper, and then have normal plating processing done, the
final copper thickness on the board as a whole, will be nearly 1.5oz
(because the board faces get plated as well). Hence if you need to specify a
very exact thickness, it becomes vital to talk to your PCB manufacturer, and
look at how to achieve the required final thickness. I had a RF application,
with very 'tight' specifications on the copper thickness, and we ended up
having to use a special initial 'stock' material with 0.6oz copper, to get a
final coating that was 15 thou thick (just over 1oz), +/- 1 thou. This also
involved accurate plating control by the manufacturer.