Hot Air Solder Leveling Thickness Control Hot air solder leveling covers the exposed copper with a thin solder coating and then blows the excess off with heated air, and the thickness it leaves behind is set by the balance between the two. A coating that is too thick bridges fine…

Carrier Tape Pocket Adhesion and Feeder Performance The tape pocket that holds a component before placement is part of the assembly process, even though it is supplied by the component vendor. A pocket that is too tight, a cover tape that peels too hard or a reel that has been…

Underfill Capillary Flow Time and Void-Free Fillets Underfill capillary flow is the mechanism that carries a low-viscosity resin under a package without pressure, and the time it takes decides how much of the gap is filled. Resin that arrives too late leaves an unfilled corner, and resin that flows too…

Lamination Cooling Rate and Residual Stress Control Cooling rate is the part of the lamination cycle that is most often left to the press rather than specified, and it decides how much stress is frozen into a multilayer panel. A press cools by circulating water through the platens or by…

Plating Rectification and Copper Thickness Distribution Plating rectification is the conversion of alternating current into the direct current that drives copper onto the panel, and the quality of that conversion decides how evenly the metal is deposited. A rectifier that delivers a rough, rippled output produces a deposit that varies…

Router Feed Rate and Edge Quality in PCB Depaneling The router separates panels into individual boards by cutting along a path with a small carbide bit, and the feed rate is the speed at which that bit travels through the material. It is the parameter that balances cut quality against…

PCB Impedance Coupon Sample: Checking a Small Piece Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB impedance coupon sample gives you a practical advantage when…

PCB Impedance Coupon Environment: Where It Happens Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article explains PCB…

PCB Impedance Coupon Handover: Passing It On Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article explains PCB…

PCB Impedance Coupon Review: A Second Look Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article explains PCB…