Electronics Forum: wet (Page 1 of 178)

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Thu Jan 25 12:18:40 EST 2007 | wagoner

There are several smd components in our factory that don't reliably wet to solder during reflow. Paste and placement are good, but the component won't wet reliably. All of the other components on the boards solder fine, but one of these components

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Wed Jan 31 17:57:07 EST 2007 | blnorman

We've had multiple issues with non-wetting components. You say only one part is not wetting? Profile won't be the culprit, if so you would have more part issues. We've used SnPb with lead-free parts for some time now, no issues. The issues we had

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Thu Jan 25 16:58:53 EST 2007 | wagoner

We are using tin-lead solder. The components could be lead free components, they probably are. I will check the plating on the components and investigate changing it.

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Thu Jan 25 21:49:12 EST 2007 | realchunks

Wagoner, Try switching to a transitional paste designed for no lead parts on a leaded board. Running your current paste at higher temps will dry out your flux too soon, which may be your problem.

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Fri Jan 26 09:49:53 EST 2007 | dyoungquist

You should have no problem using lead-free components with tin-lead solder. Is your reflow oven IR or hot air? If you are using an IR oven and the components are white or light colored, they may not be heating up enough for the solder to flow on

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Mon Jan 29 16:30:11 EST 2007 | wagoner

We reflow with hot air. Our peak reflow temp is 220 to 225 degrees C. Thanks for all of the ideas.

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Tue Jan 30 04:20:26 EST 2007 | Phil J

Print your paste onto a ceramic tile, place the offending component onto it and send through the reflow oven; then observe the results. You will soon see if the component is solderable!

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Thu Jan 25 13:20:17 EST 2007 | slthomas

Are you running a lead free process? If not, have you identified these as lead free components? If so, have you increased the temps in your profile to accomodate that? After that, I'd look for a AgPd (silver/palladium) or some other such PITA platin

Nonwetting Components - why won't components wet to solder?

Electronics Forum | Thu Jan 25 17:14:44 EST 2007 | slthomas

Good luck with that. ;) More likely you'll have to adjust your profiles. In our case with the palladium terminations we had to touch them up. There were other parts on the board that couldn't take more than 5 seconds at ~235 C� (don't remember for s

Is there anyone who knows a recipe to wet etch Ta2O5 ?

Electronics Forum | Fri Sep 22 09:20:57 EDT 2000 | S. REYNAUD

Hi guys !! I'm searching a method to wet etch 100 Angstr�m of an optic layer of Ta2O5, through a photo resist mask. Thanks in advance St�phanie

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