Chip Array Solder Joint Goals

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   I noticed a difference between IPC chip array solder joint goals of Toe= 0.35, Heel= -0.10, Side= -0.10 and PCB Libraries solder joint goals of Toe=0.20, Heel= 0.00, Side= 0.00.  Can you correct me if I'm wrong and if not can you please explain?

Thanks,
Rick

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rickdehart Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 18 Apr 2012 Location: Austin, TX Status: Offline Points: 184	Post Options Post Reply Quote rickdehart Report Post Thanks(0) Quote Reply Topic: Chip Array Solder Joint Goals Posted: 26 Jul 2012 at 2:08pm
	I noticed a difference between IPC chip array solder joint goals of Toe= 0.35, Heel= -0.10, Side= -0.10 and PCB Libraries solder joint goals of Toe=0.20, Heel= 0.00, Side= 0.00. Can you correct me if I'm wrong and if not can you please explain? Thanks, Rick



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 31 Jul 2012 at 7:42am
	It depends on the size of the Chip Array. Body Length 2 mm or greater Toe= 0.35, Heel= -0.10, Side= -0.10 Body Length less than 2 mm Toe=0.20, Heel= 0.00, Side= 0.00 Same theory standard Chip Resistors & Capacitors. The are solder joint goals for micro-miniature components must be reduced to avoid excess solder to prevent solder balls and tombstoning.

rickdehart Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 18 Apr 2012 Location: Austin, TX Status: Offline Points: 184	Post Options Post Reply Quote rickdehart Report Post Thanks(0) Quote Reply Posted: 01 Aug 2012 at 9:45am
	I see the difference, but now I'm looking at Solder Joint Goals for > 1.6mm at Least. (Not micro-miniature) IPC (Least) Toe = 0.35, Heel = -0.10, Side = -0.10 Footprint Expert (Least) Toe = 0.15, Heel = 0, Side = -0.05 Do I have outdated numbers for IPC? Am I okay using the Footprint Expert (Least) numbers?

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 01 Aug 2012 at 9:59am
	You are OK using PCB Footprint Expert "Least" environment. The PCB Footprint Expert uses advanced technology for the unreleased version IPC-7351C. If you want to know the differences between IPC-7351B and IPC-7351C download the Power Point presentation here - http://www.pcblibraries.com/forum/pcb-library-optimization-presentation-free_topic468.html The < 1.6 mm is being updated to < 2.0 mm to define mico-miniature component packages. The < 1.6 mm was originally defined as any component body length less than an 0603 (metric 1608) package, when in fact, the 0603 needs to be included in the mico-miniature component package category.