Solder Mask Developing: 4 Causes of an Uneven Pattern Solder mask developing is the step that turns an exposed and cured coating into a finished pattern. The developer dissolves the unexposed coating that the artwork left on the pads, and it has to do so completely without attacking the mask…

PCB Outsourced Assembly Improvement: A Factory-Floor Review 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 outsourced assembly improvement gives you a practical advantage when you…

Damp Heat: 6 Rules for Coated Assemblies A damp heat test holds an assembly at a controlled temperature and humidity for a defined period, usually under electrical bias, and then measures whether the insulation between conductors has survived the exposure. It is a slow test by design, because the mechanisms…

Stencil Aperture Misalignment: Finding Print Drift Fast Stencil aperture misalignment is a lateral offset between the aperture in the stencil and the pad on the board at the moment the squeegee passes. Typical limits sit near 25 um for fine pitch work, and the defect only becomes visible when the…

PCB Outsourced Assembly Traceability: From Design to Repeatable Production 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…

Electroless Nickel Bath: Design Rules and Process Limits The electroless nickel bath deposits the nickel layer that carries the gold in an ENIG finish, and its chemistry decides the phosphorus content of that layer. Unlike an electrolytic cell, the bath plates by chemical reduction, so the deposit forms on every…

PCB Outsourced Assembly Environment: Design, Process, and Quality Notes 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 outsourced assembly environment gives you a practical advantage…

IMC Growth: 6 Rules for Solder Joint Life IMC growth is the thickening of the intermetallic compound layer that forms where solder meets copper or nickel, and it begins in every solder joint from the moment the alloy melts. A thin layer is what makes the solder joint possible, because…

PCB Outsourced Assembly Timing: A Practical Manufacturing Guide 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 outsourced assembly timing gives you a practical advantage when…

Laser Drill Taper Control: 5 Rules for HDI Blind Vias A laser drill taper is the difference between the diameter a blind via shows at the copper surface and the diameter it reaches at the bottom of the hole. On a nominal 75 um target the entry may open to…