Electronics Forum | Tue Jul 30 12:15:15 EDT 2002 | Rick Lathrop
Hi Dave, The paste applied to the board ends up on the tombstone. The pad has a thin covering of solder most of the time, this is why I think they call it a dewet. Occasionally the pad shows some areas of gold and very rarely are some pads not wet at
Electronics Forum | Wed Oct 04 15:06:57 EDT 2006 | C.K. the Flip
Hmmm.. you are in a pickle then. I have AIM's "Reflow Profile Supplement" where they recommend a Low-Long-Soak (LSS) profile for situations like your's. It's an old-school type profiling approach where you ramp up to 120*C for about 1 min. then soa
Electronics Forum | Fri Jul 08 09:57:31 EDT 2005 | fctassembly
Proy, Another issue is what exact formulation of SAC is used. Much of the SAC305 being used in Asia contains phosphorus, which is added in an attempt to reduce the heavy drossing that SAC305 produces. Phosphorus acts as a flux on steel so will increa
Electronics Forum | Mon Dec 11 08:49:03 EST 2006 | billyd
All: Good morning. I'm writing this morning trying to find out what, right now, is the most used solder alloy out there, industry wide, for lead free applications. I'm talking strictly for reflow, not wave. I have to assume SAC305 is by fa
Electronics Forum | Wed Sep 18 14:12:40 EDT 2013 | pjchonis
Hello Bachman. SAC305 is the most common lead-free solder alloy, not only for wave soldering but also selective. Most of our selective customers (especially automotive) are using SAC305. What is more important than the alloy to consider is the flux
Electronics Forum | Fri Mar 19 07:24:29 EST 2004 | pjc
Before "Pb-Free" became an issue we were and still are using Pb-Free component lead finishes- such as on many TSOP, SSOP and QFP packages as well as caps. Components manufacturers changing the lead finish to no-Pb tend to ensure solderability with Sn
Electronics Forum | Thu Feb 21 06:31:20 EST 2008 | gregoryyork
We treat all our alloys with measured Phos additions. SAC alloys treated with Phos WILL/DO dross approximately half the amount of 63/37. Most Solder companies will not tell you this as they wish you to use more Solder. We are a Nitrogen Cast Solder p
Electronics Forum | Mon May 17 16:34:25 EDT 2004 | pjc
I am an equip mfrs rep. I took a customer to my wave solder principal's factory to run their boards on a wave with no-Pb alloy, (Sn96.5 Ag3.0 Cu0.5) in air environment. The results were excellent with pot temp of 263C (505F). Their boards are low to
Electronics Forum | Thu May 25 12:28:56 EDT 2006 | inds
no there is lot of difference between both the alloys.. SN100C works better than SAC305... gives little more time to remove and replace the unit without completely loosing the Cu... but there are customers who still prefer sticking to SAC305... so th
Electronics Forum | Mon Oct 25 21:49:14 EDT 2004 | davef
First, any results of pull or shear tests are unscientific at best. [We pop our BGA from boards with, appropriately enough, a beverage can opener.] Second, we have no have problems with your ENIG specification. Third, as with your customer, we'd e
