What is Minimum Annular Ring (MAR)

By Bester PCBA

Last Updated: 2024-01-02

What is Minimum Annular Ring (MAR)

Minimum annular ring (MAR) refers to the minimum width or size of the copper pad that surrounds a drilled hole on a printed circuit board. This annular ring is crucial for establishing electrical connections between the drilled hole and the components or traces on the PCB.

The size of the minimum annular ring is determined by industry design standards and can vary depending on whether it is on the inner or outer layer of the PCB. The minimum width is typically set at 0.1mm for the annular rings on the inner layer. On the other hand, for the annular rings on the outer layer, the minimum width is usually specified as 0.05mm.

The minimum annular ring size is a critical parameter in PCB design and manufacturing. It ensures the reliability and functionality of the PCB by providing a solid connection between the drilled hole and the surrounding copper pad. Manufacturers typically provide guidelines and specifications regarding the minimum annular ring size to ensure proper functionality and adherence to industry standards.

Frequently Asked Questions

What Is the Minimum Annular Ring on a PCB

For the inner layer of a PCB, the minimum width of the annular ring is 0.1mm. On the other hand, for the outer layer of a PCB, the minimum width of the annular ring is 0.05mm.

Why Is It Called Annular

The term “annular” is derived from the Latin word for ring, “annulus.” This name is given to these eclipses because of their characteristic ring of fire, which is visible even if it only lasts for a brief moment. If this ring of fire can be seen from at least one location, the eclipse is referred to as an annular solar eclipse.

What Is Annular Ring Test Used to Determine

These concentric circles, known as annular rings, can be used to estimate the age of a tree by counting them.

What Is the Difference Between Class 2 and Class 3 Annular Rings

Class 2 annular rings permit the presence of one void in 5% of the holes, while Class 3 annular rings do not allow any voids. Additionally, the plating thickness requirement for Class 2 is 0.8 mil, whereas it is 1 mil for Class 3. These are some of the varying requirements between Class 2 and Class 3 annular rings.

What Is the Minimum Width of Annular Plate

Annular bottom plates must have a radial width of at least 600 mm (24 in.).

What Is Another Name for Annual Rings

So, the appropriate term would be ‘Growth ring’.

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