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Ion Contamination level allowed on Connectors

GS

#30633

Ion Contamination level allowed on Connectors | 21 September, 2004

Hello, does any one please can tell me if any Standard says how much is the Total Ion Contamination ( ugr/NaCl sqcm equivalent, Br- in particular way) allowed on Connector surface/body ? (ie. DIMM connectors, and similar).

Many Thanks in advance

GS

PS: TIC on PBA, according to IPC-JSTD-001c is 1,56ugr/cm2 NaCl equivalent, but not found news about TIC on components/ Connectors/ PCBs (?) as well.

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#30654

Ion Contamination level allowed on Connectors | 22 September, 2004

#30656

Ion Contamination level allowed on Connectors | 22 September, 2004

We are aware of no such standard. You need to determine the acceptable level for your product in its use environment.

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GS

#30707

Ion Contamination level allowed on Connectors | 25 September, 2004

Thanks Davef,

unfotunately in order to keep TIC of PBA inside our customer TIC requirements, we have to pre-wash (DI water only)connectors before assembly. Too high level of Br- continuosly get released by connectors molding compound. Our assembly process, is clean : WS paste and Fluxes.

What could be the electrical/ chemical reliability risk or effects if we have Br- concentrated on Dimm connectors ? Electromigration could occour ?

Regards

GS

PS: connector supllier even considered this pbm and they say no standard define ion contamination level for connectors. Right, but the pbm exist.

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