PCB is divided into many types, and different types have different naming methods. Here are the naming methods of common PCBs.
1. Through hole pad
Naming format: THC(R,O)90x60d40x20.
Explanation: THC means a through-hole round hole, THR means a rectangular pad (a square has the same length and width), and THO means an oval pad. 90x60 means 90mil in length and 60mil in width. If it is a circle, just write a number.
d40x20 means that the inner diameter of the hole is 40mil long and 20mil wide. Another is THC (O) N, followed by an N (that is, NTH) to represent the non-metallized hole pad.
2. Surface mount pad
Naming format: SMDC(R,O)90x60
Explanation: This is similar to the command of the through-hole pad above. C stands for circle, for example, the mark point is circle, R stands for rectangle, which is the most, and O stands for ellipse.
The 90x60 behind is the length and width.
These surface mount components generally refer to the pads on the front side, and the general package is usually built with the front side as the common component surface. If there is a special package that needs to be placed on the revers side, then add a b after it, such as SMDC90x60_b, which means it is the pad on the revers side.
3. Via
Naming format: VIA40d20
Explanation: Everyone should be able to guess what this means. This is a via with an outer diameter of 40mil and an inner diameter of 20mil. Vias are not as complicated as pads, as long as there is only one format, the main setting is the outer diameter and inner diameter.
Another thing to note is that if we use millimeters as the unit, there may be a decimal point. For the decimal point, we can use r instead. for example
THC2r5x1d1r2xOr6, this represents an elliptical pad with an outer diameter of 2.5mm, a width of 1mm, an inner diameter of 1.2mm, and a width of 0.6mm.
Through such standardization, everyone in a company can use this format to design pads to form a standardized pad library, which can be called by everyone after it is established. If you don't do a standardized design, everyone will name it at will, and you don't know what size the pad with this name represents, and you need to open it to find out. Not to mention that when other people call this pad, they must not know what the name of the pad you wrote means.
