As a support for electronic components and a provider of electrical connections, printed circuit boards (PCBs) play a crucial role in the electronics industry. Based on different classification criteria, PCBs can be divided into various types. So, do you know what types of PCBs exist? What are their differences?
1. Structural Classification Single-sided board: The simplest type of PCB, with copper foil on one side only, while the other side is an insulating substrate, suitable for simple circuits and low-cost applications; Double-sided board: Copper foil is applied on both sides and electrical connections are made via vias, suitable for moderately complex circuits; Multi-layer board: Also known as multilayer boards, these have multiple conductive and insulating layers, achieving electrical connections through internal vias, suitable for highly integrated and complex circuits.
2. Hardness/Performance Classification Rigid board: The traditional type of PCB, with high hardness and stability, suitable for most electronic devices; Flexible board: Characterized by its flexibility, suitable for applications that require bending or conforming to irregular surfaces, such as smartphones and wearable devices; Rigid-flex board: Combines the features of flexible and rigid boards, offering the stability and reliability of rigid boards along with the flexibility of flexible boards.
3. Hole Conductivity Classification Blind hole board: The holes in this board are completely buried between internal conductive layers, making them invisible on the surface, suitable for applications that require hidden connections or enhanced electrical performance; Blind hole board: The holes only connect to one surface’s conductive layer, with the other end being a blind end, typically used for internal connections in multilayer boards; Through-hole board: The holes in through-hole boards penetrate the entire PCB, connecting all conductive layers, and are one of the most common types of PCBs.
4. Surface Treatment Classification Tin-sprayed board: A layer of tin is sprayed on the copper surface to improve solderability and conductivity; Gold-plated board: A layer of gold is plated on the copper surface to enhance oxidation resistance and conductivity, commonly used in high-end electronic products; Immersion gold board: Gold is deposited on the copper surface through chemical methods, providing better adhesion and conductivity; ENTEK board: Treated with a special chemical process to improve the oxidation resistance and solderability of copper foil; Carbon oil board: Carbon oil lines are printed on the insulating substrate for low voltage and signal transmission; Gold finger board: The edges of the gold finger board expose copper and are gold-plated for connections with other PCBs or modules; Immersion tin board: Similar to immersion gold board, but uses tin instead of gold for deposition, making it relatively lower in cost.
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