Electronics Forum: soak (Page 31 of 55)

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

Re: Noclean soldering to gold

Electronics Forum | Mon Dec 06 12:37:57 EST 1999 | Russ

Christopher, in response to your request concerning if I have the same issue using OA fluxes the answer would be no. This finish works well with all of our current Water Soluble fluxes. As a note, I have done some further testing and so far it see

Re: stencil epoxy debonding

Electronics Forum | Tue May 02 14:19:26 EDT 2000 | Bill Schreiber

There are two primary causes of epoxy adhesive bond failure, heat and over exposure to moisture. Ultrasonic cavitation is a only a mechanical "scrubbing" action on a microscopic level. However, if the adhesive bond is week or has small areas of det

Re: Solder Balls on 0805 capacitors

Electronics Forum | Tue Jul 04 16:13:09 EDT 2000 | TOOLMANTIM

HELLO BILL I HAVE SOME QUESTIONS FOR YOU 1:HOW ARE YOU CLEANING YOUR STENCIL 2:ARE YOU SINGLE OR DOUBLE PRINTING. 3:ARE YOU USEING VACUUM FIXTURES OR NOT? HERE ARE SOME OTHER THINGS TO TRY. IF YOU ARE CLEANING YOUR STENCIL OFTEN BECAREFUL OF USEING

Re: solder balls on high temp.solder

Electronics Forum | Tue Dec 12 17:54:04 EST 2000 | ralph

I've had this problem myself, though in using water soluables. But the process to eliminate it is still the same. There are three possible causes for this to occure. Too much humidity, to much solder, and too much heat. Are you leaving the paste

Reflow of 0402 capacitors

Electronics Forum | Thu Mar 08 12:40:54 EST 2001 | Ralph Merk

We are currently using 0402 resistors and capacitors in our production process. Our equipment is as follows: - DEK 265 - Siemens S25/F5 - Vitronics XPM520(5 zones) - 2% silver solder Alpha WS678 The problem is that randomly some 0402 capacitors are

0201

Electronics Forum | Thu Jun 14 23:21:30 EDT 2001 | oem boy

I am working on 0201 development for my company in the UK, and I am planning a rather extensive DOE for my reflow oven profile. I am planning on studying various ramp rates, soak times, times above liquidus, peak temps, etc... My biggest concern

no contact on BGA

Electronics Forum | Tue Jun 26 12:24:24 EDT 2001 | nifhail

Thanx for the reply Dave. We actually had a few thermocouples attached from underneath to see if there is any delta in temperature within the same BGA's ball. They looks OK, with the slope of 1 -2 Deg C,soak at 120 Deg C - 150 Deg C at about 90 sec,

QFP Defect

Electronics Forum | Mon Jun 25 06:07:56 EDT 2001 | mzaboogie

Hello, I have a board that has been giving us problems for some time now. It is fairly well populated, mostly with IC's and SOT's on the topside. There is a Zilinx QFP160. This component does not reflow well. All of the other components look OK. A t

QFP Defect

Electronics Forum | Mon Jun 25 09:08:22 EDT 2001 | Dave G

What type of board finish ? I've seen this same defect with QFP's on some of our HASL boards. Best I can tell either the PCB's have poor solderability or uneven pad heights due to poor solder leveling at the PCB fab. Newer PCB's seem to yield bette


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