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| Date: | Fri, 1 Dec 2006 13:26:16 EST |
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Victor, SMOBC does not affect the ENIG process.
SMOBC (solder mask over bare copper) is an acronym that generally defines
the selective solder process (i.e., there will only be assembly solder in areas
exposed by solder mask).
It does not define, however, the bare board surface finish.
In this case the end-user instructed SMOBC but failed to indicate a
preference of bare board surface finish. Two separate issues.
Failing to specify a surface finish is frankly common for several reasons:
* Designers have come to know that today's PCB surface finishes
sometimes change like the seasons (e.g., why specify immersion tin today when next
year's immersion kryptonite will be en vogue?)
* Buyers can't always get the same surface finish from all suppliers.
Nail yourself down to, say, high-temp OSP, and watch how many of your
suppliers reply to RFQs with No-Bid.
So if you design for an OEM who plays Wheel-Of-Surface-Finishes, leaving the
print to state "SMOBC" and nothing more can save you a load of ECNs and
eliminate sourcing limitations.
And don't even get me started on Contract Assemblers, who cringe anytime
they have to explain to an OEM that there's something mission-critical missing
from the print...
Bob
ROBERT LAZZARA
VP, Business Development
T: (800) 560-9457
F: (800) 878-5566 (y servicio de mensaje espaņol)
E: [log in to unmask]
W: _www.CircuitConnectUSA.com_ (http://www.circuitconnectusa.com/)
____________________________________
In a message dated 12/1/2006 12:52:46 P.M. Eastern Standard Time,
[log in to unmask] writes:
How does SMOBC effects the ENIG plating process?
Victor
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