Electronics Forum | Thu Jun 19 11:43:05 EDT 2008 | Roy
When the component suppliers specify the cap as no more than 50sec (or even less time)above 200C, is there any way the lead-free profile window will fit if we wil have to achieve a peak temp of 230c for at least 30sec for the lead-free process? maybe
Electronics Forum | Thu Jul 01 20:47:48 EDT 1999 | Scott McKee
I called a new customer today and told him that one of his parts on the proto boards (a capacitor with a polarity 'tit') was too long for the pads and the pads were small causing the end opposite of the "tit" to lift up. I suggested that the product
Electronics Forum | Fri Sep 07 14:55:25 EDT 2007 | jseagle
Change to through hole or hand solder. we are in the same boat and have not foound a reflow solution. James
Electronics Forum | Mon Sep 10 11:16:37 EDT 2007 | russ
Can you implement a longer soak? how many feet of heat do you have in oven? Russ
Electronics Forum | Thu Jun 19 12:48:32 EDT 2008 | mumtaz
What the hell our you talking about 200 c max? I would think any nolead part is capable of going hi-er that this. I think you are looking at max temps or something that does not make sents for temps you need to reflow.
Electronics Forum | Thu Jun 19 14:33:57 EDT 2008 | realchunks
My board reaches 240 C for 45 seconds. Most of my lead free parts require 230 C for a minimum of 30 seconds.
Electronics Forum | Thu Jun 19 15:07:23 EDT 2008 | realchunks
Sure! But they warm up slower than everything else, so it's not a big deal. You can taylor your profile around them and never exceed your 50 second threshold.
Electronics Forum | Thu Jun 19 12:07:09 EDT 2008 | ck_the_flip
You answered your own question! Vapour phase is the way to go for this. Conventional ovens won't allow this, unless you find away to defy Physics. That's an absurd constraint to begin with: 200C. Most Sn-Pb profiles require 205 - 210 minimum for
Electronics Forum | Thu Jun 19 12:27:14 EDT 2008 | guqing
Thanks CK. You are right the 200C constraint is absurd, but it's the reality, and the worst is this kind of components will go through lead-free profile. Do you or any body here experiencing the same problem? any body using Vapor phase and having suc
Electronics Forum | Thu Jun 19 12:40:09 EDT 2008 | realchunks
If I read this right, it says 50 seconds or less above 200C. It doesn't say you cannot go above 200 C. Right? if so we do it all the time. We have some Quality gurus here that always blame our ovens for everything form a didle-I-Joe to a Dam-If-I
