Entries by Lengyel Norbert

Tolerances on PCB

What tolerances should I design into my PCB? Where possible, design to PCB industry standard mid-range tolerances. If you use these tolerances you should be able to source your boards from any fabricator in the world without cost-penalty. Eurocircuits use these specifications and tolerances as the basis of our lowest-cost pooling services. Of course there […]

The smallest possible distance between two holes

What is the smallest possible distance between plated through holes? A. The holes are a part of different electrical nets? Plated through holes that belong to a different electrical net, need at least 0.25mm base material between their hole walls. To calculate this, you will need to count with the manufacturing tool size which is […]

Eurocircuits and conflict minerals

What are conflict minerals?   Conflict? Conflict minerals are minerals originating from areas of armed conflict and human rights abuse, notably in the eastern provinces of the Democratic Republic of the Congo. These minerals are traded through middlemen from neighbouring countries, so countries where conflict materials can originate from include also Angola, Burundi, Central African Republic, […]

Gold plating for edge connectors

Gold plating over edge connectors Eurocircuits offer two types of gold finish: Electroless Nickel Immersion Gold (ENIG) as a surface finish for the whole PCB, and hard plated gold over plated nickel for edge-connector fingers. Electroless gold gives excellent solderability, but the chemical deposition process means that it is too soft and too thin to […]

Bow and Twist in printed circuits

What is Bow and Twist? According to the IPC-A-600 standard bow and twist (flatness of the board) is : “Flatness of printed boards is determined by two characteristics of the product; these are known as bow and twist. The bow condition is characterized by a roughly cylindrical or spherical curvature of the board while its […]