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April 2009

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Subject:
From:
John Goulet <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 20 Apr 2009 20:49:56 +0000
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I believe IPC allows 20% overhang which avoids rework from placments that are alittle off and didn't correct during reflow. 

In your case you'd have to be concerned with the placement accuracy and potential rework since the design is taking up almost all of the tolerance. 
----- Original Message ----- 
From: "Cindy S. Bohler" <[log in to unmask]> 
To: [log in to unmask] 
Sent: Monday, April 20, 2009 2:10:34 PM GMT -05:00 US/Canada Eastern 
Subject: [TN] The effects of vibration on SMT part overhang 

We have a case where we are putting a 2512 package resistor in a location 
that was designed for a 2515 package resistor.  There will not be any 
overhang in the X direction, but there will be a 14% overhang in the Y 
direction.  Does anyone know the effects of vibration on SMT part overhang? 
Thanks. 

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