Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.

Coplanarity check


Coplanarity check | 18 March, 2005

hi guys, I need a help here. Does anyone know what is the standard for coplanarity check for fine pitch IC that well practiced? I am using SIEMENS F5 for fine pitch IC placement.SIEMENS F5 do have the capability for coplanarity check.

My customer requirement was 3mils but the machine was set for 6mils coplanarity check.

Please help me.

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Coplanarity check | 18 March, 2005

Im not fimiluar with SIEMENS F5 but I believe that lead length devations translate to coplnary devations. As a lead gets bent inward or outward the coplnary changes. I dont know what the ratio is but you may be able to set tolorances for lead length to accomplish this.

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Coplanarity check | 20 March, 2005

Thanks pmd for input. The main concern here, was there any standard document regarding this coplanarity check were implemented?

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Coplanarity check | 21 March, 2005

I'd say you already have some documentation, from the customer requirements, eh? I'd also say that regarless of any "standard", if your customer wants xxmils, give it to them, unless of course you'll have to go "above and beyond" what you think is reasonable, then you may need to pull out some IPC and such, hope this helps.


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