0.50 mm pitch QFPs at 2 oz copper thickness

[Anonymous_Ricky]

Dear All,

What could be the issues in fabrication of PCBs with <=0.50mm pitch components and 2 Oz copper thickness.

BR,

Ricky

 

[marce]

Start of with a thinner copper for base, say 1oz and have it plated up to achieve 2oz, thats what I have done and seems to be pretty standard practice.

 

[Anonymous_Ricky]

Hi Marce,

Thanks for your reply
My other concern is, could there be any chance of pads getting shorted due to 0.50 mm fine pitch and 2Oz copper thickness.

Ricky

 

[sivamani]

Yes there will be accept ratio issues and also it depends on the manufacturing capabilities..

 

[marce]

No thats why you have them made out of lighter copper and plated up to 2oz, you also get better pad definition with less etch back.