Lifted land/pad criteria is covered in IPC-A-610C Clause 10.7.2 starting
on page 10-18. While the illustrations show lands associated with
through-hole leads, Clause 1.2 is very specific that words take
precedence over the illustrations and there are no words in 10.7.2 that
restrict this criteria to through-hole lands. This applies to via or
test probe lands as well as through-hole termination lands.

1.4.3.5 is not clear as to it's meaning and is often taken out of
context. When IPC-HDBK-610 was developed statements of interpretation of
1.4.3.5 were added as follows: 
This statement has two meanings. 
* When no criteria for a specific condition is provided in this
Standard, nonconformance needs to be determined by the supplier and may
require agreement with the end user; see 1.3 for additional information.

* When the Standard states a specific acceptable criterion but does not
provide a corresponding defect criterion, nonconformance needs to be
determined by the supplier and may require agreement with the end user.

Revision D of 610 (still in development)  has a little wordsmithing on
the statement to change the "are acceptable" to "may be acceptable" to
reinforce that a decision has to be made: "Conditions that are not
specified as defective or as a process indicator may be considered
acceptable unless it can be established that the condition affects end
user defined form, fit, function, or reliability." 

Jack Crawford
Director, Certification and Assembly Technology
[log in to unmask]
847-790-5393
fax 847-504-2393
 

-----Original Message-----
From: Bruce D Stilmack [mailto:[log in to unmask]] 
Sent: Monday, November 03, 2003 10:13 AM
To: [log in to unmask]
Subject: [TN] Lands on via's


Could anyone provide an interpretation of the requirements regarding the
pads or lands on via's?  Presently I have some that are missing, but
there
is no trace connections at these points.  The pads were used as Test
points
during GENRAD testing.  Does anyone feel this is a defect or can it be
discounted using para 1.4.3.5 as a condition not specified?

Bruce Stilmack
GDLS-TO Manufacturing Engineer
(850) 574-4773
[log in to unmask]

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