Electronics Forum: corners (Page 1 of 66)

Larger lands in corners

Electronics Forum | Thu Jan 10 18:32:20 EST 2008 | stevek

Our layout guy recently started making land patterns with the corner lands oversized. These are for leadless and various flatpack parts. He claims this is to improve manufacturing. I had seen a few boards with this just as I got out of the CM worl

Larger lands in corners

Electronics Forum | Mon Jan 14 22:52:48 EST 2008 | davef

Using larger pads on the corners is fairly common to improve self-alignment of BGA and CSP. For example, "9.3.2.8 Large corner pads and overprint The self-alignment of BGA or CSP can be improved through a design change. By utilizing a large board pad

BGA Warping at the corners

Electronics Forum | Fri Aug 30 11:17:19 EDT 2013 | jth

Hi, the BGA and/or the PCB may be warping excessively during reflow. We offer testing services to measure warpage of BGAs and PCBs during reflow to JEDEC and IPC standards. Let me know if you'd like to learn more about our services: joe@zntechnolo

BGA Warping at the corners

Electronics Forum | Mon Jun 17 09:52:33 EDT 2013 | sara_pcb

My circuit board contains 11 x 11 matrix 1mm pitch BGA, The device was tested in socket on evaluation Board. We handed over the actual PCB & devices for re-flow. The assembly house first re-flowed all the SMT components other than BGA. BGA was placed

BGA Warping at the corners

Electronics Forum | Mon Jun 17 19:10:04 EDT 2013 | hegemon

You have not mentioned exactly how the BGA was reflowed onto the board. Was it sent through the oven again after the mini-stencil, or was it heateed up and reflowed using a BGA rework station, or other hot air device?? From the sound of it (outside

Shorts in corners of BGA devices

Electronics Forum | Wed Jun 21 18:51:34 EDT 2000 | John

What is the most likely causes of shorts in the corners of BGA devices?. Is there a method of removing single shorts without removing the device?. John.

BGA corners curling up during rework install...

Electronics Forum | Fri Oct 27 23:08:58 EDT 2006 | KEN

slow your heating ramp down. You are "tater-chipping" the BGA.

BGA corners curling up during rework install...

Electronics Forum | Fri Oct 27 07:39:54 EDT 2006 | jdumont

Just wondering if anyone has seen this problem before. We are using a 456 ball FPGA and during installation on our BGA rework machine the corners curl up causing opens there. The part was profiled with our KIC and matches the paste MFG spec. Is this

BGA corners curling up during rework install...

Electronics Forum | Fri Oct 27 08:19:53 EDT 2006 | davef

Josh: Search the fine SMTnet Archives for background discussions. For further discussion on the "being hosed by the physics": http://www.cooksonsemi.com/tech_art/pdfs/Controlling%20Warpage.pdf

BGA corners curling up during rework install...

Electronics Forum | Fri Oct 27 09:05:28 EDT 2006 | jdumont

Thanks a lot for the suggestions. I will try baking and see what develops. For the record the parts are stored in nitrogen atmos. under 5% RH. Doesnt mean they werent overexposed when they got here however... JD

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