Both via VIA and pad PAD can perform similar functions in PCB board design.
They can all be inserted into component pins, especially for devices in in-line
First, let's talk about the difference: the via is the hole on the PCB,
which is usually used for interlayer conduction and can also be used for heat
dissipation. The pad is the disk on the via, just like the pad of the inserted
However, in the PCB manufacturing process, their processing methods are
1. How much is the hole in the VIA design, and what is the hole. Then go
through the process steps such as sinking copper, and the final actual aperture
will be about 0.1mm smaller than the design aperture. For example, the via hole
is set to 0.5 mm, and the actual aperture is only 0.4 mm.
2. The diameter of the PAD will increase by 0.15mm when drilling. After the
copper sinking process, the aperture is slightly larger than the design
aperture, about 0.05mm. For example, if the design aperture is 0.5mm, the hole
diameter will be 0.65mm, and the finished hole diameter is 0.55mm.
3. VIA will cover green oil in some default PCB processes, which may be
blocked by green oil and cannot be soldered. Test points can't be done
4. VIA's welding ring has a minimum width of 0.15mm (in the case of the
general process) to ensure reliable copper plating.
5. The minimum width of the PAD's solder ring is 0.20mm (in the case of the
general process) to ensure the adhesion of the pad.
The via includes a via pad.
The via holes are also referred to as metalized holes. In the double-panel
and multi-layer boards, in order to connect the printed conductors between the
layers, a common hole, that is, a via hole, is drilled at the intersection of
the wires that need to be connected at each layer. In the process, the
cylindrical surface of the hole wall of the via hole is chemically deposited
with a layer of metal for connecting the copper foil to be connected in the
middle layer, and the upper and lower sides of the via hole are formed into a
circular pad shape. The parameters of the hole are mainly the outer diameter of
the hole and the size of the hole.
The via hole can be not only a via hole but also a buried type. The
so-called through-hole via refers to the through-hole through all the
copper-clad layers; the buried vias only pass through the middle copper-clad
layers, as if buried by other copper-clad layers.
One of the via pads is that the hole metallization penetrates all of the
metal layers, and the other is that the surface metal layer has pad
The above is a detailed explanation of the difference between the via hole
and the via hole pad in the PCB circuit board design. Hengtian Weiye is a
manufacturer of PCB design + production + assembly one-stop service. If you have
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