Contents
How small can a VIA be?
You can drill vias having a minimum size of 0.15mm and a 0.3mm solder pad. And, the maximum drill size can be as large as you may like. On the other hand, different PCB via sizes may need a manual drill process to raise production expenses.
What is the use of Via in PCB?
A Via is used to make an electrical connection between the layers of a Multi-Layer PCB. Connecting multiple layers of a board makes it possible to reduce the size of the PCB, as layers can be stacked. A via is constructed by placing copper pads on each layer of the PCB and drilling a hole through them.
How do you calculate Via size?
Via Sizing Calculations and Charts
- Minimum hole size = Maximum lead diameter + 0.25 mm (Level)
- Minimum hole size = Maximum lead diameter + 0.20 mm (Level B)
- Minimum hole size = Maximum lead diameter + 0.15 mm (Level C)
How much current can via carry?
Vias have very low resistance and even a 0.35 mm drill via can safely carry 2 amps of current. Furthermore, their resistance can be reduced by filling them with solder.
What should be the via diameter of a PCB?
A via of 0.1mm should be (theoretically) enough to deal with a 12mil trace. This assumes the via plating thickness is the same as the trace thickness, which is probably not valid, particularly for thicker boards. However, even doubling the 0.1 mm (4 mil) via diameter gives a pretty small hole.
How to calculate the size of a PCB drill hole?
Once you collect all this information, you can calculate your PCB’s pad sizes by: Pad Diameter = Minimum Hole Size + Minimum Annular Ring X 2 + Minimum Fabrication Allowance 1.Pad Diameter = Minimum Hole Size + 0.1mm + 0.60mm (for Level A of IPC-2221) 2.Pad Diameter = Minimum Hole Size + 0.1mm + 0.50mm (for Level B of IPC-2221)
What is the minimum size for a Via dia drill?
The number in the forum, 0.03 mm, is a typo. You can see that they equated this to 12 mil (0.012 inch), indicating they really intended to write 0.3 mm. 0.3 mm is a reasonable minimum drill size when you need to minimize costs, but many shops offer down to 0.2 mm (8 mil) as a standard technology.
What does a via mean on a PCB?
Vias are the “tunnels” on PCBs. You may be surprised to find out that your contract manufacturer will typically think of a via as any hole in the board. Whether a hole is serving as a net interconnect or being used to solder the lead of a thru-hole component, it is still a via to your CM.