George L.

Hello,

I just ordered parts from mouser for some projects, stocking up!

One of the products I ordered, Green/Red Bi-color SMD LED (part # 78-TLMV3100) has a red sticker saying:

"NOTICE Parts are moisture sensitive. Bake prior to vapor or IR soldering to reduce the chance of damage."

What does this mean, if I leave then in a moist room will they be damaged??

I have never seen this before.

Has anyone seen this before?

thanks,

George L.

RadioRon

This is quite common in the electronics industry. Many IC packages have the potential to let a tiny amount of moisture into the package. If this happens and then the factory tries to solder the IC using the standard heating cycle of a soldering oven, which heats the part fairly quickly, then the water vapor might expand and cause the package to burst (or something like that). Most IC reels are shipped in sealed foil bags to keep moisture out, and if you open the bag but not use the reel for a while, then you are supposed to bake the entire reel slowly at a low temperature to get the moisture out. Then it is OK to use these ICs in a normal reflow oven.

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RadioRon

George L.

there is no problem if I just solder them pin by pin right...with a 15W Iron?

thanks,

George L.

RadioRon

I've never had any problems soldering pin by pin with an iron and haven't heard of anyone else suffering problems due to moisture, so its pretty safe I believe. Lots of my junk box ICs are old and they always work when I solder them.

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RadioRon

Nigel Goodwin

Yes, the small possibility of problems is only of concern to manufacturing techniques, where they are flow soldered - hand soldering isn't a concern.

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