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What Buyers Must Know About PCB Surface Finishes

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Michael Allen
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Blogger
Re: Re : What Buyers Must Know About PCB Surface Finishes
Michael Allen   8/1/2014 10:01:40 AM
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No, size does not matter.

tirlapur
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Supply Network Guru
Re : What Buyers Must Know About PCB Surface Finishes
tirlapur   7/28/2014 3:55:40 PM
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@Michael: ENIG seems to be a great surface coating for PCBs, but is there a surface coating policy for different sizes of PCBs?

tirlapur
User Rank
Supply Network Guru
Printed Circuit Boards
tirlapur   7/28/2014 3:54:31 PM
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The return of investment for using higher material board surface finishes is greater than using cost-effective surface finishes, but only until the growth curve reaches the saddle point. If we are talking about PCBs in a yearly updating technology (like motherboards etc.) then using high density surface finishes will reduce the profits of the company, as these low maintenance surface finishes last at least 2 years but for an annually changing technology, this is simply not needed.

docdivakar
User Rank
Stock Keeper
Immersion Tin
docdivakar   7/22/2014 3:40:23 PM
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Regarding Immersion Tin, one needs to be careful about PCB floor planning. Under certain conditions, Tin Whiskers can pose a big headache via shorting. Additives to Tin as well as stress relieving can lessen the potential for Whisker growth, see:

http://www.atotech.com/data/publications/pcb/Immersion_Tin-Kinetics_of_Whisker_growth.pdf

MP Divakar



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