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Why gold plating on PCB?

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#84575

Why gold plating on PCB? | 28 February, 2020

What is the use of gold plated boards?

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#84577

Why gold plating on PCB? | 28 February, 2020

Back in the 50's, 60's and 70's gold plated boards were all the rage for high reliability. test equipment, milspec etc. Nowadays only edge connectors are gold plated. Immersion plated gold is also used but it doesn't last the distance like gold plated.

sarason

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#84578

Why gold plating on PCB? | 28 February, 2020

&gt; What is the use of gold plated boards? <BR> <BR> With the increasing integration of IC, the more IC the more dense. The vertical tin spray process is difficult to flatten the pads, which brings difficulty to the SMT mounting, and the shelf life of the tin plate is very short.The gilding plate solves these problems. I have read an article that gives a very useful answer for this question. Hope it can help you. http://www.starivergroup.com/News/info.aspx?itemid=1176

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SMTA-Joe

#84581

Why gold plating on PCB? | 28 February, 2020

We've made the decision to move towards Gold Immersion on our PCBs to eliminate flatness issues with QFNs and BGAs. Land/component pad geometry, population density, and other factors, have made it necessary to ensure a near perfectly flat surface that standard "hot air leveling" just doesn't achieve.

This message was posted via the Electronics Forum @ SMTASMTA

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#84582

Why gold plating on PCB? | 28 February, 2020

Flatness is only half of the advantage. Gold doesn't corrode. There are other flat surfaces but do not last as long as gold.

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#84583

Why gold plating on PCB? | 28 February, 2020

I'm not 100% sure which type of gold you're asking about, but if you're talking about hard gold plating, I think the most common use is to provide a durable surface for things like membrane switch contacts because it resists abrasion and other mechanical wear better. It's not good to solder to, though.

If you're just asking about the common use of gold as a soldering surface, i.e. ENIG (electroless nickel, immersion gold) it's primarily for it's flatness advantage over HASL finishes (much better for reflowing high density packages), and it's ability to maintain solderability over time.

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#84680

Why gold plating on PCB? | 20 March, 2020

The gold plating on PCB has a 40% higher resistivity, and it is much more expensive. So gold is not used instead of copper for conductors. Last month I purchased some PCB from Cplfpc and Greatpcb.

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