In this article I’ll show you how a homemade controller built around a Renesas evaluation board can transform an inexpensive toaster oven into a reflow oven. The ovens cost so much because they need strictly controlled thermal profiles to ensure good soldering and also to limit the thermal stress on the components. Great! The only issue is that reflow ovens cost a fortune, ranging from $2,000 to $1 million. A reflow oven is a well-controlled oven that allows to you cook a PCB with its components and solder all of the pads simultaneously with solder paste. But small packages like 0603 resistors are likely to fly away when soldered with hot air and stick to the soldering iron at the worst time.Ī solution to this problem is to use reflow oven technology just like the manufacturers do. The components must be soldered individually with either a small soldering iron or a hot-air pencil. It’s possible to solder the majority of SMT components by hand, but it’s painful and time-consuming. High-speed designs (using high-speed digital or radio frequencies) won’t work using large through-hole packages. Many new and exciting components are only available in SMT packages. I’m sure you have noticed that SMT is now mandatory for prototypes, even if a project isn’t space-constrained. Robert’s H8/3687-based SMT Reflow Oven Controller transforms a conventional infrared toaster oven into an effective reflow oven that ensures thermal control.įor years surface-mount technology (SMT) has been the manufacturing technology of choice, particularly because it’s less expensive than classic through-hole processes and because of the reduction in board size. When designing high-speed applications, working with SMT components and soldering by hand can be tedious.
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