Dear Jim,
Are you implying that those nice people that use IPC-A-610 are ignorant? Or
worse they cannot understand the concept or process requirements.
The 610 is stated in the Scope as saying that it presents acceptance
requirements
for the manufacture of electrical and electronic assemblies. Historically,
electronic assembly
standards contained a more comprehensive tutorial addressing principles and
techniques. For
a more complete understanding of this document's recommendations and
requirements, one
may use this document in conjunction with IPC-HDBK-001 AND J-STD-001.
IPC-A-610 has criteria outside the scope of J-STD-OO1 defining handling,
mechanical and
Other workmanship requirements.
Barry Gallegos
Western Electronics.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of James Moffitt
Sent: Tuesday, October 17, 2000 1:53 PM
To: [log in to unmask]
Subject: [TN] JSTD or A610
Ken, All Concerned:
- There is quite a big philosophical difference between IPC-A-610 and
J/STD-001.
- Think of IPC-A-610 as a big "picture book" that shows how a particular
attribute should look. The A-610 is great when teaching operators who have
English language comprehension problems because an awful lot can be
communicated by examining the features of each image, drawing or photo. The
"down side" of A-610 is that all considerations of process or material
control are abdicated/ignored. With A-610 you can use whatever process and
whatever materials you want, and as long as it looks like the acceptable
conditions depicted, the product is OK.
- Think of J/STD-001 as a distant cousin of the now-defunct Mil-Specs. The
J/STD places a lot of emphasis on process control throughout the assembly
activity. Such things as pre-assembly cleanliness, pre-assembly
solderability, limits on the quantity of defects/process indicators
(expressed in parts per million), post assembly cleanliness (analytical
extractive tests instead of visual examination), etc., etc., etc. Yes, most
of the acceptance criteria identified by J/STD-001 are included in
IPC-A-610,
the big difference is that when using J/STD-001 you are obligated to use
controlled and documented processes to assemble the product. The "down
side"
of the J/STD-001 (if you want to call it that) is that you have to know what
you are doing, know how to control your processes and have documented
process
control instructions.
- It is important for the user of either J/STD-001 or IPC-A-610 to fully
understand that invoking one of the documents by contract does NOT invoke
the
other document. If you ask for products that meet IPC-A-610 you are not
paying for, and should not expect to get, the process controls, cleanliness
levels, etc., associated with J/STD-001. Conversely, when invoking
J/STD-001
by contract you are not paying for, and will probably not get, all of the
criteria of IPC-A-610 since A-610 covers several technical areas not
addressed by J/STD-001 (mechanical assemblies, jumper wires, solderless
(wire) wrap, etc., etc.
- Hope the above eliminates some confusion. Jim Moffitt, Technical
Director,
Electronics Training Advantage, Indianapolis, IN
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