Electronics Forum: corners (Page 4 of 66)

PCB outer dimensions

Electronics Forum | Tue Jan 22 16:05:51 EST 2008 | jmelson

This is an OUTSIDE corner spec or an inside corner spec? If outside, I don't see why it is a problem, but will require programming the router or making a template (if an "old school" shop.) Yes, if an inside corner, then it requires a small router

Melted BGA part

Electronics Forum | Thu Sep 15 09:31:02 EDT 2016 | ladmo1

While removing one part, another part - BGA part - several components away, actually melted on one corner - you can see the plastic body of the part oozing out around one corner between the solder balls. Several of the solder balls on the one corner

BGA CORNER WARP

Electronics Forum | Thu May 17 07:58:25 EDT 2001 | Bob Willis

I think the answers to the problem have been given but if anyone wants to see this happening and solder shorts forming during corner warp there is a video clips on BGA shorts to download. Its available free on http://www.bobwillis.co.uk It should am

BGA rework

Electronics Forum | Tue May 14 20:58:42 EDT 2002 | davef

Maybe the issue is not a proper rework method. Your shorts on the corners are caused by too fast of a profile causing the corners of the BGA to get too hot, too fast, which made them curl, like tatter chips.

Solder Bridging on BGA

Electronics Forum | Fri Jun 14 14:29:22 EDT 2002 | davef

Russ makes good points. Search the archives for: * Links to rework machine profiles. * Discussion on people causing corner shorts on their BGA, when heating them too rapidly, making the corners to curl like potato [potatoe?] chips.

BGA Bowing on the corners.

Electronics Forum | Fri Aug 22 09:50:20 EDT 2003 | Mike Snider

I am placing a plastic Cypress, 256 pin BGA on a small assembly, and I cannot stop the corners from bowing. I've moved my profile up and down with no results. Any suggestions?

QFP soldering issue

Electronics Forum | Thu Jan 15 15:08:43 EST 2004 | mrmaint

Are your qfp's being stored properly. I have seen this in the past and it turned out to be a moisture issue. We saw most of the problems on the corners. The component would swell during the reflow process thus lifting the corners. After baking the re

BGA and QFP orientation in trays for pick and place

Electronics Forum | Wed Jan 14 18:33:21 EST 2004 | ex maintain leader

qfp tray one corner on the holder is 45 degree cutted there is the pin 1 bga also one corner is different in the tray at tape packaging I'm not sure, I have seen diferent comissions belong supliers

SMTnetters corner

Electronics Forum | Fri May 14 09:00:55 EDT 2004 | neil

Yes, the SMTneters corner is still available. We just didn't keep the navigation link to it. You can find it here: http://www.smtnet.com/smtneters/ Neil

PCB outer dimensions

Electronics Forum | Mon Jan 21 18:57:02 EST 2008 | davef

We think maybe 50 thou would be a more approachable corner radius. Why does your customer want to have radiused corners?


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