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Ioan,
But you can touch the component at 300°C max if you are using Pb-free?
Sounds like a process recommendation, not a real thermal restriction. I'd contact the vendor and discuss your process, it may be acceptable.
Ben
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Wednesday, November 19, 2008 11:50 AM
To: [log in to unmask]
Subject: [TN] Low temp solder alloy
Dear Technos,
I have another one for you.
We do these boards having 100 to 200 TH high power LEDs (5mm in
diameter) and see a fairly high return since after a few weeks in the
field some LEDs will die or become intermittent. So we sat down and
started reading the app notes, see an example at
http://www.cree.com/products/pdf/LED_Lamp_SolderingHandling.pdf
Well, it turns out that these components cannot be touched up with
solder irons at more than 280C, which is 530F. This is rather low and I
wonder if we are going to be able to get the solder up the hole.
Anyways, I am heading towards the shop, in order to do some testing.
In the mean time, I would like to have your opinion on low temp alloys I
could use for touch-up:
o What alloy should I look at?
o Can I use a low temp alloy to touch up eutectic SnPb joints?
Any compatibility / reliability issues related to the eventual mixture?
o Any particular low temp alloy that is more compatible with
SnPb?
o Anything else I should think about?
Thanks again,
Ioan
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