PCB Material Utilisation and Panel Yield Improvement Laminate is one of the few costs in PCB fabrication that scales directly with the area you order. A panel that wastes twenty percent of its sheet pays for that waste on every unit, and the penalty repeats for the life of the…

PCB Material Selection: Choosing PCB Materials: FR4, Ceramic or Metal Core Most boards are made from FR4 because the material is cheap, well understood and available in a wide range of thicknesses, copper weights and glass transition temperatures. The exceptions arise when one property becomes the binding constraint: heat that…

Aluminium Nitride Substrate: Key Checks Before Release When a power stage has to move a large amount of heat through a thin, electrically insulating layer, the material that does the job is usually a ceramic. Aluminium oxide has served that role for decades, but as switching devices based on silicon…

Pulse Plating Through Holes in Ceramic Substrates Plating a hole through a ceramic substrate is a different problem from plating a hole through a glass reinforced epoxy board. There is no resin to absorb the chemistry, no drilled barrel with a rough surface to key into, and no way to…

HDI Boards For Energy Storage Systems: A Selection Guide Energy storage systems are unusual in that they combine three demands that normally pull a design in different directions: high frequency communication, large currents, and a service life measured in decades outdoors. A battery management controller has to sample cells continuously,…

Return Via: Via Design for High Speed Channels Vias are the cheapest way to connect layers and the most expensive way to ruin a high speed channel, because the same feature that provides the connection also introduces a discontinuity. Designing them deliberately rather than by default is what separates a…

Revision Control: Documentation Discipline for PCB Projects A printed circuit board is a document as much as it is a product, and the quality of the documentation determines whether the board can be built again in three years. The disciplines that make that possible are simple and they are usually…

Solder Paste Jet Printing for High Mix SMT Production Solder paste jet printing applies paste directly to the pads from a dispensing head, with no stencil, no squeegee, and no printing stroke. It was once a niche tool for prototypes, but as high-mix production has become normal, the ability to…

Immersion Silver Finish: Defects and How to Prevent Them Immersion silver is the surface finish that offers the solderability of gold at a fraction of the cost, and it does so with a layer measured in fractions of a micron. That thinness is the source of both its advantages and…

Reflow Oven Maintenance and Zone Calibration Guide A reflow oven is treated as a fixed asset: the profile was qualified years ago and the machine has run ever since. In reality, heaters age, thermocouples drift, blowers lose efficiency, and flux accumulates on the internals until the thermal environment no longer…