Electronics Forum | Thu Oct 05 11:48:00 EDT 2006 | Mario Scalzo, SMT CPE
Good morning all. We are able to offer some insight into the problem and offer a recommended reflow profile to solve this issue, but it really depends on the solder paste that you use, as different manufacturers use different boiling point solvents.
Electronics Forum | Thu Oct 19 20:03:04 EDT 2006 | darby
I agree with Stephen there! Or maybe we just didn't care enough about looking into it in the COLD profile days! Back to df: I don't think any manufacturer is going to give you a tolerance level, they'll stick with what they've told you -225. If it's
Electronics Forum | Fri Nov 10 17:00:05 EST 2006 | darby
Yep. If speed is not an issue a Heller 1500 will pretty well do you fine unless you are trying to process a brick. A Heller 1700 will not give you any more heated length, so don't get sucked in to that one. However, they are a little more fun to pl
Electronics Forum | Tue Nov 21 12:35:59 EST 2006 | CK the Flip
It probably depends on the Silver content. We are also using Sn62Pb36Ag2. The paste manufacturer told us that the reason for the small silver content was so that it could wet better to the lead-free component and board finishes bearing silver.
Electronics Forum | Wed Dec 20 20:34:09 EST 2006 | davef
We're not real clear on the issue. [Got ourselves wrapped around lead (Pb) versus lead (termination), we think.] That aside, comments are: * Boiling point of lead [Pb] is [/K]: 2022 [or 1749 �C (3180 �F)] * It's possible that the material that com
Electronics Forum | Wed Jan 24 10:08:36 EST 2007 | electronhose
Immersion Silver, ImAg, is becoming the finish of preference. This is due to it having similar process limits vs. SnPb HASL. There were some early concerns about shelf life, but new chemistries have extended finish shelf life to 12 months+. Many boar
Electronics Forum | Mon Jan 29 10:11:12 EST 2007 | muse95
What does your customer want you to do? I would not want a CM soldering one of my boards with leadfree paste if I didn't ask him to. Whatever you do, get approval first. Two things to consider: If the other components are not rated for leadfree tem
Electronics Forum | Wed Apr 25 15:19:15 EDT 2007 | flipit
Steve, See the link below. See the out take from the link below. http://forum.europa.eu.int/Public/irc/env/rohs/library?l=/requests_exemptions/resistant_applications/hpdoc/_EN_1.0_&a=d The specific verbiage is, "This exemption request seeks to
Electronics Forum | Mon Aug 13 05:39:31 EDT 2007 | saaitk
I am building a double sided SMT board. On the first side I have a 405 ball BGA. When we build and run the second side through our reflow oven on about 25% of the boards run the 405 ball BGA on the underside of the board has fallen off. About 80% of
Electronics Forum | Wed Nov 07 12:29:41 EST 2007 | oswaldorey
Although greatly publicized and many papers on the subject, I wish to hear experiences from the field from professionals who have migrated from SnPb wave soldering to PbFree wave soldering. I am being pushed by one of my largest clients, an internati
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