Electronics Forum | Mon Jan 13 21:52:16 EST 2003 | davef
Haaaaaa!!!! You contractors get all the fun don't ya??? Consider: * Replacing the balls on the corners of the devices with balls composed of a "hard solder", yano something like 90/10. * Shimming to prevent excessive collapse of a heavy BGA during
Electronics Forum | Fri Jan 17 22:08:31 EST 2003 | iman
try using thermal pads under the area without the balls. yeah, its a pain but we did it before for lot run of 500pcs BGA. Not feasible for mass production run, you say? well, thats why there's a thing called DMF, and why its the designer guys res
Electronics Forum | Mon Jan 13 17:50:54 EST 2003 | jonfox
I was looking for some good documentation that could nail down some pros/cons of voids, but haven't found any. The biggest issue is if you are going to temp cycle the chips/PCB after assembly. Depending on the cycle, the situation of the test, it c
Electronics Forum | Mon Jan 13 18:22:55 EST 2003 | davef
100 sec) and decrease reflow temp to 205C. * Understand that voids are primarily process indicators. There is experimental evidence that voids retard crack propagation locally around the void on a temporary basis. There is no standard, IPC or otherw
Electronics Forum | Thu Jan 16 04:02:18 EST 2003 | johnw
The IPC 610 actally conflict's with 7095 which give's a better indication of what's acceptable. I believe that IPC are reviewing both. Motorola did a bunch of work before basically showing that void's aren't that bad up to a certain size, I think pro
Electronics Forum | Mon Jan 13 21:06:39 EST 2003 | davef
When posting a new thread, the person posting must make entries on two screens. Screen #1: "New Thread" Screen Screen #1 REQUIRED entries are: * Topic * Select one from "Create In Forum" entries Screen #2: "Post Message" Screen Screen #2 REQUIRED
Electronics Forum | Fri Jan 24 18:37:08 EST 2003 | Kelly
I am in Supplier Quality and it seems that the quality/service has gone down with most of our current suppliers. The automotive industry lead times definitely impact the quality as well as many PWB shops downsizing in the US. The move to off-shore fo
Electronics Forum | Fri Jan 24 21:45:14 EST 2003 | jonfox
We have had to return 6-8 lots out of the last 20 to the board house we (used to) use. From V-score cutting through pads to missing pads (and they say they electrically test our boards?!). I mean, come on, you can look at a PCB and see if there is
Electronics Forum | Mon Jan 27 10:33:16 EST 2003 | MA/NY DDave
Hi Just keeping this alive to see if anyone else posts. It seems to me that this might be a degradation due to life cycles of all products/services as they progress from creating high profits to being driven down and down in price. Topped off with
Electronics Forum | Thu Jan 16 05:42:18 EST 2003 | nifhail
I've a query. I have one new Customer whom insisted us to use RMA paste on their product. The problem is, on some of their products they use via hole as the test point in where all the PCB finished are ENTEK and as usual I have to print solder paste
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