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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