Electronics Forum | Sat May 27 11:13:27 EDT 2000 | Steve Thomas
Subject line pretty much says it all. We're going to try some stencil design changes to reduce midship solder balls. Anyone have some comments on pros or cons for either?
Electronics Forum | Tue May 30 10:46:06 EDT 2000 | Travis Slaughter
Sounds like you could have a problem caused by the gold. How thick is the plating? Are the connector leads gold too? I have seen gold cause dry looking brittle solder joints in the past.
Electronics Forum | Thu May 11 18:24:12 EDT 2000 | Micah Newcomb
placement is only ok?, what size chip is this? Is the pad spacing correct? Are the apertures on your stencil reduced or 1:1. Stencil thickness? Do the problem areas heat up evenly? special plating on terminals of cap? Need more info.
Electronics Forum | Wed May 03 21:12:13 EDT 2000 | Dave F
Steve: We talked about hi temp solders for a different application recently. Lookit: High temperature solder paste for gold plated MCMs - Tuan Bui 13:43:06 01/26/2000 Good luck Dave F
Electronics Forum | Mon May 01 15:04:15 EDT 2000 | Ernie Miller
I need a good cleaning cycle for leaded brass (CuZn39Pb3). Product to be ni/au loose peice plated
Electronics Forum | Wed Feb 23 21:38:26 EST 2000 | Dave F
Mike: I'm with you. The only variable is the component. Look for corrosion, uneven plating, or crud on one of the end-caps. Good luck. Dave F
Electronics Forum | Mon Jan 29 12:42:24 EST 2001 | davef
Several points about your query are: * TI�s solderability protection specification is a minimum of 3 u" of palladium over 40-60 u" of nickel plate over a http://www.ti.com/sc/docs/products/logic/package/palladm/index.htm
Electronics Forum | Tue Feb 06 20:57:44 EST 2001 | Kyle
The Universal GSM is a very accurate and repeatable machine. I have had one for the last 5 years and it is still repeatable to +/- .0015". I use a Robotic Vision Systems glass plate kit to check the repeatability. it has glass slugs and glass boar
Electronics Forum | Wed Feb 07 20:57:31 EST 2001 | Kyle
What are you placing on this equipment? If you are placing flip chips, you need to have a glass plate test system to verify your machine is accurate and repeatable. If you purchase new equipment and plan to place flip chips or ultra fine pitch, it
Electronics Forum | Thu Feb 08 08:43:21 EST 2001 | davef
Cal: Thanks for your comments. We all should do our best to sure that others' comments are accurate. It is important to help maintain the integrety of the Forum and for personal devlopment. It would be good if we had fewer threads like: PCB
