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Rohs and non rohs components on a board

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ViVian

#47216

Rohs and non rohs components on a board | 5 February, 2007

what type of solder paste I should use if Rohs and non rohs component mount on same board

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#47226

Rohs and non rohs components on a board | 6 February, 2007

Good afternoon,

You have to use lead paste since none-RoHS components won�t withstand elevated temperatures. Solder paste manufacturers offer a lot of transitional pastes designed specially for mixed process. Ask your paste supplier for transitional paste.

BR, Pavel

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CK Flip (MOTW)

#47242

Rohs and non rohs components on a board | 6 February, 2007

ViVian, check the great SMT archives. Below is a good thread on this very topic. :-)

http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=11344&#Message47106

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#47243

Rohs and non rohs components on a board | 6 February, 2007

Leaded paste, is what we use if the process or product requires it.

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#47244

Rohs and non rohs components on a board | 6 February, 2007

> Good afternoon, > > You have to use lead paste > since none-RoHS components won�t withstand > elevated temperatures. Solder paste manufacturers > offer a lot of transitional pastes designed > specially for mixed process. Ask your paste > supplier for transitional paste. > > BR, Pavel

Non-ROHS parts are more likely to be capable of taking higher temperatures. ROHS parts have restrictions on what goes into them includeing certain fire retardents.

Don't confuse ROHS compliant with ROHS capable. And don't trust component manufactures to make their ROHS parts ROHS capable.

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Wayne

#47253

Rohs and non rohs components on a board | 6 February, 2007

If it is instructed to ship lead free product to customer, then low temp lead free solder paste can be considered. For example, Viromet solder paste from Singapore Asahi (peak temp is between 220 to 225 degree C).

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Jose

#47587

Rohs and non rohs components on a board | 12 February, 2007

Today is more complicate to find components with lead than with "lead free", and the, I think that you have very feww lead components. And, if don�t work on exceptionals companies, you MUST use LEAD FREE PASTE. In one case, or in the opposite, the result its very similar, try to use lead free in everything.

Jose (Spain)

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blnorman

#47825

Rohs and non rohs components on a board | 19 February, 2007

We use SnPb paste and bar with leaded and non-leaded component finishes. The predominant finish on components we use is Tin, there are a few NiPdAu. We've had no problems with the component finishes used in the SnPb process.

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