Electronics Forum: corners (Page 9 of 66)

BGA Voiding Problem

Electronics Forum | Fri Apr 23 16:19:17 EDT 1999 | Todd

We are just starting to manufacture a PCB with a .039" fine-line PBGA. We are currently seeing voids, mainly in the center, that are as much as 45%. We also intermittently see the corner balls of the PBGA smaller than the center balls. We are using a

CP6 Nozzle sticking

Electronics Forum | Mon Mar 07 18:41:13 EST 2005 | jimmyb

--IE, Funny.--- I "remember" kinda, from the early CP6 years, things about the springs. The early Fuji springs had sharp ends, and if you spun the nozzle, prior to final attachment, the opposite way it could stick, and if it was spun the right way,

finger markers

Electronics Forum | Mon Oct 15 09:58:27 EDT 2007 | davef

Never heard of "special finger marker stickers" for checking wave parallelism. We assume that you're talking board-to-wave parallelism. We use a Durostone fixture with a thermalcouple [TC] in each far corner of the fixture (flush to the bottom of th

Solder bridging on one corner of BGA

Electronics Forum | Wed Jan 23 19:44:45 EST 2008 | hegemon

In addition to the pre-emptive steps mentioned above, in my experience there are certain BGA package designs that seem more prone to that corner bridging. I have seen some packages that will essentially "curl" down at one corner as the package begin

BGA not level when placed

Electronics Forum | Mon Feb 25 08:14:04 EST 2008 | adetuc

Hi ... We use DRS24C Air-Vac machines for placing BGA devices, and have been having problems with shorts on corners of one device in particular, its a PBGA and its size is 4.5cm square and 15grams weight. When the component is picked up and the com

Re: Wave IC, thief or robber pads use.

Electronics Forum | Mon Feb 28 11:53:08 EST 2000 | Wendy Casker

Charlie, There are 2 ways to go and they both work. 1. Add thieving pads of the same size and pitch to all 4 corners 2. Make the exisiting 4 corner pads "doublewides" Both ways work. I like #2 because you don't get a bridge. Even though a bridge

Re: Wave IC, thief or robber pads use.

Electronics Forum | Mon Feb 28 11:53:08 EST 2000 | Wendy Casker

Charlie, There are 2 ways to go and they both work. 1. Add thieving pads of the same size and pitch to all 4 corners 2. Make the exisiting 4 corner pads "doublewides" Both ways work. I like #2 because you don't get a bridge. Even though a bridge

BGA CORNER WARP

Electronics Forum | Tue Apr 24 10:05:09 EDT 2001 | Robert Steltman

Help please.... We have just run a prototype board using a number of BGA devices on it. The corners on two of the BGA's (PBGA357) seem to be higher than the centre of the device. ie the outer bumps seem to be "stretched" compared to the centre bumps

BGA warpage

Electronics Forum | Wed Jan 20 13:07:16 EST 1999 | Robert Noory

I have received prototype PBGA (256 pins) devices from Motorola (actual part number = KXPC850ZT50). These parts seemed very warped on the edges. When I put the part on a plain surface, it rocks quite a bit when I press lightly on a corner. I have

Re: BGA warpage

Electronics Forum | Wed Jan 20 20:42:08 EST 1999 | Tony A

I have received prototype PBGA (256 pins) devices from Motorola (actual part number = KXPC850ZT50). These parts seemed very warped on the edges. When I put the part on a plain surface, it rocks quite a bit when I press lightly on a corner. I h


corners searches for Companies, Equipment, Machines, Suppliers & Information