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Date: | Fri, 21 Feb 97 05:26:36 cst |
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Hi Steve -
The short answer to your question is NO! If you don't have an overall
problem with solderability then "raising the bar" will only increase
cost without reciprocal benefit. It sounds like you have the
occasional, vendor specific solderability problem and no wide spread
issues. Adding any specification requirements only makes sense if the
additional requirements provide some benefit to the process or product
for the extra cost or logistics that such requirements will induce.
The reason for the extra cost for JSTD-002 components is the component
manufacturers must perform a couple of additional tasks (i.e.
solderability testing and documentation of those results) that are not
part of their normal process flow. As for the changing of the
component part numbers, that may have more to do with how the vendors
track the component requirements - I know vendors that do not have
"two" component numbers for a JSTD-002 or nonJSTD-002 component. The
component vendors processes are just like the assemblers processes -
nobody is setting up a process to produce "bad" product! JSTD-002 is a
tool that the electronics industry can use as a baseline benchmark of
comparison and as a tool for assuring a given level of solderability.
If you are satisfied that the level of solderability you are receiving
from your vendors is adequate for your processes and product
performance then the 'addition" of more solderability requirements is
not necessary.
Dave Hillman
JSTD 002 Committee Chair
[log in to unmask]
______________________________ Reply Separator _________________________________
Subject: j-std-002 parts
Author: [log in to unmask] at ccmgw1
Date: 2/19/97 12:08 PM
HI,
I'd like to inquire about the supply side market for commercial grade
components that meet the requirements of IPC/J-STD-002 re. solderability
Currently we do not specify any solderability spec for the purchase of our
electronic components. We get many products that solder very well - both
wave and hand with various fluxes(no clean - RMA - OA). Some parts are not
so good - even mil spec.
After talking with our major distributors it seems that the commercial grade
parts that meet J-STD/IPC/Mil standards for solderability are not as
available as straight commercial grade and will cost a bit more. They also
said I would have to change part numbers - which would be a horrific task.
Is this true or am I talking to the wrong suppliers?
The second question is that given we do not appear to have a "problem" with
most of our straight commercial grade parts, what gains could be made by
sacrificing some cost and leadtime? No strong evidence exists that suggests
a field performance / reliability concern. I can not see how I could justify
"raising the bar", however many experts say that to change would be an
improvement.
Anyone have a practical philosophy on this dilemma that I can borrow?
Steve Ross
US&S
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