Electronics Forum | Tue Jan 31 12:13:26 EST 2006 | Calvin Kolokoy
Today's regular Sn-Pb paste chemistries are designed to run at higher peak temperatures ensuring that your lead-free alloys will coalesce with your regular Sn-Pb solder. That being said, it is do-able to solder both types in one oven. Generally, wit
Electronics Forum | Mon Mar 06 22:30:12 EST 2006 | mainenetservices
We have a customer transitioning slowly to lead free due to necessity rather than a need to comply i.e. some of their BGAs can only be purchased Pb free only. So for this we would want to produce them a leadfree soldered PCB (not necessarly RoHS comp
Electronics Forum | Wed Apr 14 07:59:54 EDT 2004 | arcandspark
Makes a lot of sense, thanks for the excellent input. The peak temp I am running fo our pb free (238C and approx. 90 seconds above 183 C)is the recommended profile from T.I and also the solder paste manufacture. Not sure exactly what the melting temp
Electronics Forum | Mon Mar 25 16:40:17 EDT 2013 | rrpowers
I have a customer that is wanting to use a low-temp solder paste such as SnBi for a lead free circuit, however they are specifying PET for the flex circuit. I have always used polyimide for SMT reflow due to the temperature limitations of polyester.
Electronics Forum | Wed Aug 24 09:52:26 EDT 2005 | javi
Patric, The product is exempted from the RoHS regulativ 1'st phase(2010) and our policy is to follow the new EU regulations as this will also push the Industri technolegy and the SMT process. Our concern is more that we are not able to qualify the p
Electronics Forum | Tue Jan 31 12:02:22 EST 2006 | aj
how would you apply both pastes.? anyway, I have succesfully run leadfree bga with lead paste. You gotta find a profile that kinda meets both requirements. Taking into consideration the peak temp and time above. dont have details on hand but I ca
Electronics Forum | Fri Feb 23 09:12:13 EST 2024 | carl_p
How have you created the oven profile? Have you taken into account the heat soak from the components/board/carrier etc. Is the paste being mixed correctly before use, is the paste in its use by date & at ambient temp etc? I thought almost all the
Electronics Forum | Fri Feb 24 13:04:17 EST 2006 | patrickbruneel
Hi All, The change over to lead-free is as easy or as difficult as you want to make it The big problem I see with this lead-free transition is that there is no benchmark of acceptability and no defect data (yet) related to visual appearance of a sol
Electronics Forum | Fri Jun 06 10:47:27 EDT 2003 | Marc Peo
Kevin, Agree with John's thoughts on profiling and the max temp of 240 degrees in particular. To add to it a bit we have seen the following parameters put in place at many assembly houses to protect against overcooking the components: --Time above
Electronics Forum | Wed Apr 14 12:27:49 EDT 2004 | pjc
try Indium Corp's SMQ230. http://ncsmq230.indium.net/ Peak "on board" temps of 229C with good wetting have been obtained.
