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Plated Through Hole VS Via: What's the Difference

Views: 185 Author: Site Editor Publish Time: 2023-06-16 Origin: Site

When designing a printed circuit board (PCB), understanding the various interconnection options is crucial for successful implementation. Two common interconnection methods are plated through holes (PTHs) and vias. These interconnects play a vital role in establishing electrical connections between different layers of the PCB and components. While both serve similar purposes, there are significant differences between plated through holes and vias that impact their applications and functionality. In this article, we will explore the differences between plated through holes and vias, examining their definitions, construction, purposes, and applications.

What’s the Difference Between Plated Through-hole and Via

Plated Through Hole (PTH)Via
DefinitionA hole with copper platingAn electrical connection between layers
PurposeProvides electrical connection between layers or to componentsEstablishes electrical connections between layers
ConstructionCopper plating extends through the entire holeCopper pad connects the layers through the hole
TypesSingle-sided, double-sided, and multilayer PTHThrough-hole via, blind via, buried via
Component MountingComponents can be mounted directly into PTHsComponents are not mounted directly into vias
ConductivityHigh conductivity due to complete copper platingConductivity depends on the plating and inner layer connections
SizeLarger in diameter to accommodate componentsSmaller in diameter for signal routing
ApplicationSuitable for components requiring a strong mechanical connectionUsed for interconnecting signal and power traces

What's Plated Through Hole (PTH)

Plated through holes (PTHs) are the most common type of via in a printed circuit board (PCB). They can be easily identified by holding the PCB up to light and checking for visible light passing through the holes. PTHs are relatively simple to create using drills or laser lights to create a complete borehole, making them cost-effective. However, not all circuit layers require plated through holes, and their usage can consume additional PCB space. These holes are drilled through the PCB and lined with a conductive material like copper, which is then plated with metals such as tin or gold. The purpose of PTHs is to establish connections between different PCB layers or components on the board, facilitating the flow of electrical signals.

Printed Circuit Boards Vias

What’s a Via

A via is a hole drilled through a single layer of the PCB and filled with a conductive material like copper. Vias are primarily used to establish connections within the same layer of the PCB or to connect components on the same side of the board. They come in two main forms: through-hole vias and microvias. Through-hole vias are larger in diameter and commonly found in standard PCB designs, while microvias are smaller in diameter and used in high-density circuit designs where space is limited. Understanding the distinctions between vias and their different types is crucial for successful PCB layout and design.

PTHs and vias are holes used in PCBs for conducting electricity. PTHs pass through the entire board and connect different layers. In contrast, vias are used to connect different parts or components on the same PCB layer.

About The Author

I am the Engineering and Sales supervisor working in Victorypcb from 2015. During the past years, I have been reponsible for all oversea exhibitions like USA(IPC Apex Expo), Europe(Munich Electronica) and Japan(Nepcon) etc. Our factory founded in 2005, now have 1521 clients all over the world and occupied very good reputation among them.


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