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Companent storage time before soldering

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#43866

Companent storage time before soldering | 12 September, 2006

Hi All, We find out that some companents in leed free reflow soldering process have bad wetting and soldering This soldering problems caused by companent storage time after shipment Could somebody inform us about maximum storage time for different companent Thank you Peter

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#43887

Companent storage time before soldering | 12 September, 2006

We've been soldering leadfree components for maybe 15 years. We'd be surprised not to be able to store components for at least a year, not that we purposely do that. Component fabricator process determine the maximum storage time for components. Most component datasheets provide guidance on storage conditions.

So at incoming inspection, what are the results for your "dip & look" solderability testing [IPC/JEDEC J-STD-002A] of these components.

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Rob

#43894

Companent storage time before soldering | 13 September, 2006

Hi Peter,

are you talking about storage times after opening sealed packaging and the effects on solderability due to oxidisation/moisture sensitivity?

Cheers,

Rob

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#43899

Companent storage time before soldering | 13 September, 2006

Hi Davef and Rob, Thank Davef for your advice,we will make "dip&look" soldering test. Rob,we are tolking about companents storage time after manufacturing. Sometime we get companents which was shipment more then year ago In many cases we have problems with soldering such companents in leed free process Particulary this happens with big companents(big capacitors, power transistors) Data sheets for majority companents do not contain storage time How solve this problem other SMT producers? Best regards Peter

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#43901

Companent storage time before soldering | 13 September, 2006

We get a more active flux.

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Rob

#43904

Companent storage time before soldering | 13 September, 2006

Hi Peter,

Out of the 1.5 billion components we shipped last year, we had 3 components back for solderability issues. All 3 had been taken out of their vacuum packaging and left to oxidize for a number of weeks.

We don't see it as an issue, but we do print MSL level on every package.

We too would use a more agressive flux.

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