Solenoid Driver and Flyback Protection A solenoid is an inductor with a mechanical load attached, and every time the driver turns it off, the stored energy has to go somewhere. The choice of where that energy goes decides how fast the valve releases, how much stress the switch sees, and…

Press-Fit Pin Insertion Force and Plated Hole Control A press-fit joint replaces solder with mechanical interference, and the whole connection depends on dimensions that are measured in tens of micrometres. The compliant pin must deform enough to grip the barrel, the plated through hole must be tight enough to hold…

PCB Trace Inductance: Practical Process Controls Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB trace inductance from the perspective of a PCBA factory floor, covering estimating trace…

PCB Pad Parasitic Capacitance: What the Pad Adds 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…

Rework Practice and Heat Control on Assembled Boards Correcting a defect on an assembled board is a repair, and the difference between a repair that lasts and one that returns is the control of heat. The techniques differ, and the same technique applied without control produces damage that appears later.…

PCB Trace Capacitance: Design, Process, and Quality Notes Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB trace capacitance from the perspective of a PCBA factory floor, covering…

PCB Single Ended Impedance: A Practical Manufacturing Guide Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB single ended impedance from the perspective of a PCBA factory floor,…

PCB Differential Pair Impedance: Holding the Target Number A differential pair carries one signal on two traces, and the receiver reads the voltage difference between them. That arrangement rejects common-mode noise, but only while the pair holds its target impedance. The number is set by trace width, gap, copper thickness…

PCB Impedance Control And The TDR Test Report Once a board carries a controlled impedance line, somebody has to prove that the value was met, and on anything faster than a low speed design that proof is a measurement rather than an assurance. The tool used for the measurement is…

Solder Ball and Bump Height Control in BGA Assembly Solder ball geometry is one of the most closely watched characteristics in modern BGA assembly. Every ball has to carry the right volume, sit at the right height, and hold a narrow window from reflow through final test. When bump height…