You are correct. 50% is the maximum and if components are to close to
allow 50% plus the minimum electrical clearance then you have to go with
what the minimum electrical clearance will allow.  I hope that came out
right.

Russell Nowland
Alcatel-Lucent           
Advanced Manufacturing Engineer
Address: 14000 Quail Spring Parkway, Suite 300
Oklahoma City, OK 73134
email: [log in to unmask]
Desk: 405-302-1660
Cell: 405-203-0034
Fax: 405-302-1622

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Roetz
Sent: Monday, September 10, 2007 4:09 PM
To: [log in to unmask]
Subject: [TN] IPC 610 Side Overhang

Greetings,
 
Can someone provide clarification on the 50% side overhang rule in 610?
My colleagues interpret this to mean that in order to meet class 2,
component spacing must allow for this 50% overhang for every component.
This means that spacing between components must be at least the width of
the component, to allow for the 50% overhang.
 
I read note 1 to state that 50% is the maximum allowable - that if
components are spaced closer than this, the minimum electrical spacing
is the maximum allowable. They read note 1 to state that any components
closer than 50% of the width is a violation of IPC 610.
 
Who's right and who's wrong??
 
Hope this made sense to everyone!
 
Thanks,

Jason
 

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