Electronics Forum | Fri Feb 16 09:01:05 EST 2024 | emanuel
I am confused about the parameters of the reflow profile needed to solder lead free components. We assemble boards for automotive modules required with leaded solder paste. The boards have ENIG finish. The problem is that I see some wetting issues, v
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 23 11:29:02 EST 2024 | carl_p
Would you be able to post an image of the joint in concern? Sounds a good problem to resolve. Guessing you have used an external profiler & not the oven built in type? If 100% certain the profile is correct I would focus on the paste from my exper
Electronics Forum | Mon Feb 26 20:05:09 EST 2024 | alexv
Leaded solder is liquidus at 183C, 220C is max. Sounds to me your boards might be contaminated or the plating is poor and allows oxidation. Without seeing the boards or profile, I recommend you slow down your oven for a longer soak, to allow the acti
Electronics Forum | Tue Jan 06 16:31:41 EST 2015 | jacklucas
In switching to lead free processing, we find ourselves having over 400 PCB part numbers with Sn63 HASL finish. And there is no hope of quickly purging inventory and getting our drawings changed to call out a lead free finish. I want to avoid having
Electronics Forum | Mon Dec 03 16:05:55 EST 2012 | emeto
Hi all, We are going to evaluate new LEAD-FREE solder paste. We stopped our attention on 3 manufacturers but the variety of products is so big. What would you recommend for a daily basis use? Is SAC305 the most commonly used alloy? We are a subcontr
Electronics Forum | Fri Feb 23 09:35:36 EST 2024 | emanuel
We have the standard profile as a template made according to the solder paste specs. For some boards we measure the result at 2 points, on the board itself and on top of a sensitive SOT263 module and adjust accordingly. The solder paste is well kept,
Electronics Forum | Fri Feb 23 14:50:14 EST 2024 | carl_p
That link doesn't work for me. From the more you explain - it does sound like an issue I've had in the past on a few different builds. In the end we traced it to a fault with the paste (they were having mixing issues in the chemistry) but they as y
Electronics Forum | Fri Feb 23 09:55:02 EST 2024 | carl_p
Got you. 225C for peak does seem low to me. Henkle is the main one i've used with a peak of 245c & Alpha around the same although I try to keep that at no higher than 235C as we use it for LED arrays. If the peak is that low, is the liquidus te
Electronics Forum | Fri Feb 23 11:50:14 EST 2024 | emanuel
Unfortunately it is not possible to post pictures here. It looks the same as in these photos: https://yic-assm.com/wp-content/uploads/2019/06/dewetting-1.jpg https://res.cloudinary.com/engineering-com/image/upload/v1577777622/tips/20191216_174750_1_a
.gif)
