Electronics Forum: corners (Page 3 of 66)

Posting to the Admin Corner

Electronics Forum | Wed May 31 10:44:31 EDT 2000 | Neil Peaslee

The Admin Corner allows us at SMTnet.com to correspond with the users of the site. Any problems you experience with the site or recommendations you have for the site should be entered in the Admin Corner. Questions and comments related to SMT and el

Please post your comment to the Admin Corner

Electronics Forum | Thu Aug 13 12:05:29 EDT 1998 | Cunli Jia @ SMTnet

The new SMTnet Admin Corner is meant for public discussions with SMTnet staff and among SMTnet users on site design issues, policy issues, and announcements. We hope this corner will keep the technical forum focused and help us provide the best servi

BGA with gold corner / reflow problems

Electronics Forum | Wed Jun 25 11:06:35 EDT 2003 | James

Does anyone else have the same problem with BGAs that have a gold corner. It looks like the area where the gold corner is, it does not want to reflow proberly but the rest of the BGA reflows fine. Any suggestions????

BGA Corner

Electronics Forum | Mon Jun 13 12:21:50 EDT 2011 | jimby56

Try putting a .010" shim under each corner during rework reflow. This will keep corner balls from shorting out.

Re: Land Pattern Design for PLCC's, QFP's etc... in Full Radius Corners

Electronics Forum | Tue Mar 21 16:25:23 EST 2000 | Boca

Full radius corners on pads can help with solder paste release in the stencil. The radius shape minimizes the surface area in the wall of the stencil aperture as compared to a sharp corners. When the stencil is seperating from the pcb the solder pa

BGA CORNER WARP

Electronics Forum | Wed Apr 25 10:37:14 EDT 2001 | davef

If you heat a BGA too quickly, the corners of the device will curl towards the ceiling [potato chip], because they come to temperature faster that other areas. Adding to this, thinner substrates tend to potato chip more and faster than thicker subst

Admin corner, please

Electronics Forum | Tue Jun 15 09:15:16 EDT 1999 | Clifford Peaslee

We moved this message to the admin corner, where I responded, please use admin corner for messages like this. Cliff I hate to say this because I go into this great forum all the time, but ever since the announcement of "moving to a new and faste

BGA chip corner epoxy / adhesive?

Electronics Forum | Wed Dec 06 21:59:37 EST 2006 | SMTrework

Hello, we rework BGA packages that come back from the field. I've seen on occasion a black and or red "epoxy" substance from the manufacturer on the corner of some board's BGA chips that I imagine are applied to increase corner bond of the chip to th

voids when waving

Electronics Forum | Mon Mar 12 08:59:46 EDT 2007 | davef

Questions are: * You say 'voids', but you describe poor barrel fill. Are you seeing both? * Sometimes designers need to reduce the heatsink effect of large ground and power places, but this usually shows on the two upper corner pins, not all corners

BGA chip corner epoxy / adhesive?

Electronics Forum | Wed Dec 06 22:35:05 EST 2006 | davef

Questions are: * When you say, "corner of some board's BGA chips", is it on the top of the package or between the board and the bottom of the package? * If between the board and the bottom of the package, does it span the distance between the board a


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