App note: Assembly guidelines for QFN (quad flat no-lead) and SON (small outline no-lead) packages

NXP’s app note about the internals and how to’s footprint design and solder their leadless dual and quad flat packages. Link here (PDF) The small outline no-lead (SON)/quad flat no-lead (QFN) is a small size, lead-less plastic package with a low profile, moderate thermal dissipation, and good electrical performance. It is a surface mount package […]

Hacking footprints for easier 2 layer routing

Routing complex surface mount circuits on a 1 or 2 layer PCB is tricky. TSSOP and similar small parts often don’t have enough clearance to route a trace between two leads. Mats tackled this by by removing a few unused leads. This gave him the freedom to route traces through the now available space where […]

Designing Eagle footprints from mechanical drawings

Adafruit shows how to accurately design footprints in Eagle. The process imports the mechanical drawing into Eagle, and the footprint is traced over this template. It’s best used for mechanical parts – connectors, buttons, jacks, etc – that have complicated footprint designs. You can also check out our guide to building simple footprints in Eagle, […]