Roni: Ron gives good advice on the thickness of your Electroless Nickel - Immersion Gold (ENIG) solderability preservative. Several additional comments are ENIG:
� More expensive than OSPs and HASL. � Much flatter surface than HASL, similar to OSPs. � Very supplier process control dependent, like OSPs. Make sure they meet Ron�s conditions. � Good (6 months +) shelf life (Environment condition sensitivity???), assuming Ron�s conditions are met. � Excellent solderability (reflow & wave), if Ron�s conditions are met. Can be much more difficult to solder than OSPs and HASL, if Ron�s conditions are not met. � Sensitive thermal processes, relative to HASL and OSP, to ensure gold is in solution.
As an aside, "flash gold" means different things to different people. Sometimes flash gold is "electroless gold" and sometimes it is "immersion gold." Your supplier should be able to tell you which you are buying. Be nervous if she says "electroless gold."
My2�
Dave F
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