There is no way that CEM1 single-sided will be your highest quality option,
but if lands on the PCB are designed for single sided and component leads
are clinched or partially clinched, and 63/37 solder is used throughout
(board finish, process, and component finish) it is possible to make a
reliable product. Maybe I should say WAS possible back in the day....
As with any design (but ever so much more so in this case), it's important
that no additional mechanical stresses are introduced by the packaging
(housing/enclosure/mounting features/etc), also considering thermal
excursions (ie: is a connector pushing or pulling at the solder joints when
the unit is at an extreme temp?)
I haven't had any personal experience with PbFree single-sided through-hole
products, but I hear it can be done for class 2. Also have heard that CEM1
is still possible with PbFree, but don't know any details, so maybe not for
though-hole designs. Hard to imagine...
PTH is always going to be better quality. Unsupported holes might be good
enough. It depends.
Have a great weekend,
-Chris
Charming Chan
<chancharming@AOL
.COM> To
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11/20/2009 09:21 Re: [TN] Discussion on the
AM reliability of single-sided PCB &
PCBA
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Thanks to all the inputs.
The holes on the pcb are non-plated through and no solder fill for
through-hole component, is the solder joint robust and reliable?
Our products are networking application and need high reliability, the
power supply part is out-sourcing, we need to make sure the reliability of
the out-sourcing power supply part.
Best Regards
Charming Chan
-----Original Message-----
From: Chris Ball <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, Nov 20, 2009 12:36 am
Subject: Re: [TN] Discussion on the reliability of single-sided PCB & PCBA
I would say.... it depends. Some CEM1 out there in pretty harsh env. for
any many years. Not recommending it, but it could be made to work, at
east prior to PbFree processes and finishes....
Best Regards,
Chris
Charming Chan
<chancharming@AOL
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11/19/2009 09:37 [TN] Discussion on the reliability
AM of single-sided PCB & PCBA
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ello All,
Our power system suppliers build single-sided pcb with paper-based
ubstrates, the holes on the pcb are non-plated and no solder fill for
hrough-hole component. As I know, paper-based substrates are generally
sed for the pcb build of low-cost, low-reliability, consumer products.
Our company sells CLASS 2 networking products, which are supposed to work
n harsh environment. Is it reliable enough to use such single-sided power
ssembly? Thanks a lot for kindly input.
Best Regards
harming Chan
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