Electronics Forum | Thu Jan 12 13:18:07 EST 2012 | swag
215 to 220 deg.C peak reflow. We bake then store all PCB's in low humidity cabinets (appox. 3% RH) prior to running.
Electronics Forum | Thu Oct 25 13:39:29 EDT 2012 | cyber_wolf
Wait a minute...Your peak temps are PbFree like. Why is your profiler looking at time above 183 ? What is the time above 217 ? I thought we were looking at time above 217 not 183.
Electronics Forum | Mon May 20 08:52:03 EDT 2013 | jax
Delta T is the temperature difference between the lowest and highest temperature between measurable components at any point within the reflow process... taking into account the delay time for saturation from leading to trailing edges of the product.
Electronics Forum | Mon Nov 25 00:45:35 EST 2013 | igorfo
Thank you for advice, But main concern how to detect the problems with BGA on SMT line, and how I can validate "good" or "bad" profile. PS: SPC said that process Cpk 2, temperature profile in the upper spec limit for TAL and peak temperature.
Electronics Forum | Mon Jan 27 09:24:24 EST 2014 | cyber_wolf
Dave is correct. You are running out of flux due to such a small solder deposit. Try shortening your overall time in the oven. Less than 4 minutes to peak is where I'd start.
Electronics Forum | Wed Dec 24 10:38:01 EST 2014 | jimpat
Assuming its 285 Celsius as measured at the solder joint, you are overheating the die. If 285 C is your ovens setting then you need to measure the BGA package peak temperature as well as the joint temperature.
Electronics Forum | Fri Jun 12 07:14:36 EDT 2015 | gabinocf
Thanks by your response, at this moment I have problems in a Lead Free process the issues that i have are solder peaks, by my understanding this conditions is due to lack of flux, bad temperature profile or the dwell time is too long. My concern is,
Electronics Forum | Thu Aug 11 20:12:12 EDT 2016 | davef
Different points on the board couple have different thermal masses. Look here: http://www.ecd.com/portals/5/products/vmole/V-MOLE-Verify-3-Thermocouple.pdf
Electronics Forum | Thu Aug 11 22:38:22 EDT 2016 | anhsang38
Dear Davef Thanks for your information. I already have measured it at the same position for 2 kind of component but the result does not change. Pls help me...
Electronics Forum | Fri Aug 12 08:52:29 EDT 2016 | sarason
In short physics. A large Black object will absorb more energy than a smaller non-black object. Thus the temperature will remain lower around the black object as it heats up ! sarason
