Reflow ovens meant specifically for the soldering of surface mount components may also be used for through-hole components by filling the holes with solder paste and inserting the component leads through the paste. Each segment of the oven has a regulated temperature, according to the specific thermal requirements of each assembly. Reflow soldering with long industrial convection ovens is the preferred method of soldering surface mount technology components or SMT to a printed circuit board or PCB. Show me that in a convection oven.Example of reflow soldering thermal profile.
But the more important point is that like all Vapor Phase Fluids - this is a MAX, not a desired point of process heating being terminated. The component manufacturers are probably happy with it, but as an industry we live with it because the predominant convection reflow technology cannot isolate the thermal characteristics of the process and keep the lower mass parts cooler - so they ramp faster and to a higher peak.Ģ60c is an off the shelf VP fluid.
The peak temperatures being seen by many smaller parts on complex cards are in the order of 250-260 deg C when lead free alloys are being used and convection is the process of choice. Beyond that, whether using vapor-phase or convection reflow or even a laser, don't solder like my brother. Thanks for asking the question, it's a good question. Trying to find intelligent life among those component people - lots of luck. I have to say, this is not the first time Jim and I have encountered application notes from component manufactures that were way out in space somewhere. What else on the board wants to go up to that temperature? What about the package? If you warp the package and create a bunch of head and pillow, is the vendor going to cover for you and help you out? I would really look at that part, talk to the people who are making it and be sure that that's what's required, because most of the other things on the board aren't going to allow you to go to that temperature - even if you had a vapor-phase fluid. So, maybe you want to take them up to 240 C. The answer to the question is get back to this component manufacturer, and if you can find intelligent life there, which is the first challenge, and we'll give you points for that – you can ask them why. Low silver alloys melt at 227 C. Unless they want to sell you a lot of components. I'm surprised the component manufacturer would want to subject their component to such sustained temperature.
I don't know of any solder ball alloy that requires 250 C to collapse. I don't know anybody who makes a vapor-phase fluid higher than 250 C, and I have no idea why a component manufacturer would specify a soldering temperature of over 250 C. We use a 0.8 millimeter RoHS BGA that states, it is recommended to apply a soldering temperature higher than 250 C.Ĭould we use vapor-phase system for this part? Do you have any idea why the part recommends temperatures higher than 250?" "You mentioned that vapor-phase soldering uses temperatures of 235 to 240 C for lead-free soldering. Let's see, what do we have today, a reflow question. This is Jim Hall and Phil Zarro, the Assembly Brothers, also known as ITM Consulting, and we're here to attempt to answer your process and SMT-related questions. He is a pioneer in the science of reflow. He has vast experience in SMT equipment, materials and processes.Ī Lean Six-Sigma Master Blackbelt, Jim has a wealth of knowledge in soldering, thermal technology, equipment and process basics. With over 35 years experience in PCB assembly, Phil is one of the leading experts in SMT process failure analysis. Process Troubleshooting, Failure Analysis, Process Audits, Process Set-upĬEM Selection/Qualification, SMT Training/Seminars, Legal Disputes Could we use vapor-phase system for this part?īoard Talk Board Talk is presented by Phil Zarrow and Jim Hall of ITM Consulting. We use a RoHS BGA that states it is recommended to apply a soldering temperature higher than 250 C.
To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video.