Electronics Forum | Mon Jan 11 16:16:52 EST 1999 | Jenna Sweterlitsch
This question is directed to anyone having eperience with Sn62Pb36Ag2 solder balls for BGA's. Have you seen anything like a rough, raisin-like surface texture after ball attach? If so, what did you do about it? Thanks!
Electronics Forum | Thu Apr 09 15:44:36 EDT 1998 | Earl Moon
| Is there a good way to inspect BGA | balls ? Is there an inspection piece | of equiip.? It depends on what you intend inspecting. For dimensional and tolerance measurements, I have used optical comparators. For solder ball voiding, X-Ray is used.
Electronics Forum | Mon Apr 29 03:01:53 EDT 2002 | Bob Willis
Had a similar problem recently where there were scatered balls and voids in joints and on the surface of the joints. The paste was dispenced from a cartridge with no kneeding or mixing before printing. The result was spitting and voids. Mixed the pa
Electronics Forum | Wed Jul 07 02:20:48 EDT 2004 | Koki
Please let me know exactly the Koki specification that has managed to solve the balling issue and we can look at the level of residue or the cosmetic may be what you wish to improve.
Electronics Forum | Mon Apr 18 11:26:38 EDT 2005 | davef
Whenever we hear "gold" and "balls falling off", we think of black pad [hypercorrosion of nickel]. What does your EDX show?
Electronics Forum | Thu May 26 10:47:28 EDT 2005 | james
What is the highest temperature set at in your oven and your belt speed. Also what type of oven do you have? Thanks much. Your right about alot of heat needed. We actually see the outside balls much flatter and soldered compared to the middle bal
Electronics Forum | Mon Aug 29 13:05:11 EDT 2005 | solderguy
Hi All, In IPC-A-610 there is a definition for what constitutes "Entrapped/encapsulated/attached" on page 5-14 in the note. It says that it means that the ball will not be dislodged in the normal service environment of the product. Jim Jenkins
Electronics Forum | Tue Jan 17 10:17:55 EST 2006 | Loco
Solder balls that have more than 0,1% PB are not RoHS compliant. It might be RoHS compatible meaning it can handle the higher temperatures used in a leadfree process.
Electronics Forum | Wed Apr 19 08:19:41 EDT 2006 | davef
So, your solder ball didn't collapse. What is the ball material? More and more BGA are shipped leadfree. For image posting, look here: http://www.free-webhosts.com/free-image-hosting.php
Electronics Forum | Sat Mar 24 07:50:04 EDT 2007 | davef
It's possible that 90/10 is being replaced by LF in many ball suppliers' [Alpha Metals, Kester, AIM] inventories.
