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Regarding the choosing of right Suface Finishing

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#73844

Regarding the choosing of right Suface Finishing | 27 April, 2015

hi everyone,

I want to prototype my PCB. i have designed entire thing and also created GERBER files. Now i want to be prototyped.

So, While searching online PCB manufacturing Companies, I found Many companies. But everywhere it is mentioned choose SURFACE FINISHING. I searched in internet about choosing right surface furnish but i am confused.

My requriement is

- Cost effective

- No lead

- I am using 0201 package SMD Components in my board. So, i have very small components on my board.

- I want to protype only 10 Boards for instance. So, i want to produce less volume of Boards.

Can anyone suggust me a good and better Surface Finishing.

Regards,

Anirudh THABJUL

Hardware Engineer

Lansa Diffusion

Paris, France.

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#73846

Regarding the choosing of right Suface Finishing | 27 April, 2015

Anirudh: When board fabs talk "surface finishing" they're talking about the solderability protection that you'd like on the solderable copper component mounting pads that you laid-out for each component: * Bare copper pads corrode very quickly * Corroded copper is difficult to solder * "Surface finish" blocks corrosive element in the environment

At the end of the day, ENIG is a good choise of Electroless Nickel Immersion Gold (ENIG, ENEPIG) Immersion Silver, Immersion Tin and Organic Solderabilty Preservatives OSP

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#73848

Regarding the choosing of right Suface Finishing | 28 April, 2015

thankyou for your answer.

I came to know that

"ENIG/ENEPIG is much costlier than Immersion Silver and Immersion Tin. So, my company doesn't allow me to use ENIG/ENEPIG".

So, i will suggust my company to use Immersion silver or Immersion tin.

Regards,

Anirudh THABJUL

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#73850

Regarding the choosing of right Suface Finishing | 29 April, 2015

Immersion tin is very sensitive for handling, scratches, storage condition and time, thermal influence and washing. You will get problems in second reflow if you have double sided PCB with immersion tin surface finish.

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#73852

Regarding the choosing of right Suface Finishing | 29 April, 2015

thankyou for you answer dude.

As you mentioned in your answer that immersion tin finishing gonna cause many problems. So, immersion Tin option is ruled out for my purpose. So, immersion Silver is the option left for my purpose

But, I have checked for the pricing of immersion silver and immersion tin and i came to know that cost of immersion silver is very high compared to Immersion Tin.

So, Can you suggust me any other finishings apart from immersion silver & ENIG for my purpose.

Regards,

Anirudh THABJUL

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#73853

Regarding the choosing of right Suface Finishing | 29 April, 2015

The cost of purchasing is often a small part of the cost of ownership

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#73854

Regarding the choosing of right Suface Finishing | 29 April, 2015

I have experience of Immersion silver and it's even more sensitive for all disadvantages mentioned above than Immersion tin. You can not go wrong with ENIG. It's little more expensive but in the end you save some bucks when you don't have to rework or scrap boards.

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#73855

Regarding the choosing of right Suface Finishing | 30 April, 2015

Thankyou once again dude,

You are right.I will suggust my boss to use Immersion Silver.

Regards

Anirudh

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#73856

Regarding the choosing of right Suface Finishing | 30 April, 2015

Thankyou once again dude.

I finally decided to use immersion Silver because my boss is not convinced with ENIG Cost because my company is just a startup company.

thanks once again for your suggustion.

regards

Anirudh

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#73857

Regarding the choosing of right Suface Finishing | 30 April, 2015

Let us know how immersion silver works for you.

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