What is a through hole via?
Aug 22, 2021. A Through-Hole Via is the most common type of via used in PCBs. They are formed by drilling a hole through the Printed Circuit Board from top to bottom connecting all the layers of a Multi-Layer PCB. Through hole Vias can be constructed by using a drill or laser.
How big should my via be?
The goal is to create a via with at least as much conductive area within the hole as the trace connecting to it (generally speaking, of course). My personal rule is to make the drill size diameter the same as the width of the trace, and the pad size roughly twice the diameter.
What is the size of through hole on PCB?
The inner diameter of the hole (full through) needs to be 0.2 mm or more. When it comes to the outer diameter, it needs to be 0.4mm or more. As mentioned earlier, you will find many standard PCB drill sizes.
What is trace size?
Trace widths are often measured in mils, or thousands of an inch. A standard trace width for an ordinary signal (no special requirements) may be in the 7-12 mil range and be as long as a few inches, but there are many things that should be considered when defining the width and length of a trace.
Do vias need to be filled?
Via hole sizes less than 0.3mm have the best chance of getting filled, while between 0.3mm to 0.5mm sizes, filling results may vary. Because this is an uncontrolled process, it is not recommended when holes need to be closed.
How much current can a via Take?
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 is via pad size?
Vias from drills start from 0.15mm with a 0.3mm solder pad and can drill as big as requested, but different sizes may require manual drilling, which increases the production cost. Holes smaller than 0.15mm can only be drilled by laser drill.
What is Npth in PCB?
Through holes on a PCB refer to a hole that is drilled from the top and through to the bottom of a PCB, these can be plated (PTH) or non-plated (NPTH).
How do you determine trace width?
The important characteristics to consider when selecting a trace width include:
- The current capacity of the trace (how much current will flow through it)
- The allowable spacing between traces.
- The size and pitch of the pads that the trace will be connecting to.
What is trace spacing?
What is the minimum PCB line/trace spacing? The minimum line spacing between PCB components and other traces is the distance required to withstand a given voltage. It is defined in terms of creepage and clearance distances.
What is the difference between a through hole and a via?
Through-Hole vs. Via: 1 The via labeled “2” is called a blind via. A blind via connects two or more inner layers to one of the outer layers. 2 The via labeled “3” is called a buried via because inner layers are connected but do not connect to either of the… More
What is the best size for a trace width?
In basic designs, however, where you just need to bring one trace to another layer, I would suggest using 8 mil for all traces smaller than 8 mil, and for thicker traces use the trace width for the drill diameter. It’s just a good rule of thumb. Show activity on this post.
Are there any double sided vias with a through-hole?
There are no blind or buried vias with a double sided circuit, so all vias are essentially through-holes. A plated via in a double sided circuit that has a leaded component inserted through it will often have a specific designation as a “through-hole” as opposed to other vias that only provide an electrical connection.
How do you assess the integrity of a via?
From a reliability/specification standpoint there are three entities of the via that are examined to assess integrity: Pad, knee and side wall. Bending, twisting and flexing can put a great deal of mechanical stress on the trace and solder in areas near bend or transition points.