Rigid-flex PCB- Cu on non Cu defined area.| 5 July, 2000
I need some info. on acceptability criteria for rigid, flex & rigid-flex PCB: - if extra copper condition (copper on non copper defined area) on PCB is acceptable provided - it is not violating electrical spacing or 5 mil criteria...
I have some PCB with 5 to 6 occurance of copper patches (close to the PCB edges in the static part with out violating IPC-6013 criteria for foreign material...though it is Cu. ) on both near and far side. It is repairable ...but would like to know of any existing documents ...
I need help on :
-Which IPC spec. should I refer to ..is there any other spec I should look for..I have never come across any SOW with this criteria ...(like IPC-6013 foreign matrl inclusion..)
-What are the concern in terms of RF, power, reliability, electrical and impedance characteristics for this condition..or is there any ?
Re: Rigid-flex PCB- Cu on non Cu defined area.| 7 July, 2000
This particular p/n calls for print&etch for wet process..and the problem occured due to surface contamin. with resist residue resisting copper from etching off. The high pressure nozzle was a problem at developing oper. and it is fixed now.
We are runing this P/N in proto. hence we waived this problem for now...(we could termed this problem as process indicator condition) but would like to know for documenting characterization procedure.