Printed circuit boards in the USA may be single-, double-, or multi-layered. While simple boards are typically single- or double-layered, complex printed circuit board manufacturers in the US always make them multi-layered. Simple PCBs, with their lower number of layers, have their own advantages, but they cannot meet the challenges of complicated circuits and high-density, close-pitch components. Modern equipment with complex circuitry requires multi-layered boards for optimum performance. Designers and printed circuit board manufacturers in the US have their own reasons for making their PCBs multi-layered. Nevertheless, they must also follow certain guidelines for making up the overall PCB thickness through stacking the individual layers. For this, they use various materials for constructing different layers in their boards.
Advantages of Multiple Layers PCBs over Single Layer Boards
Single- and double-layered boards are simple to assemble and use, but there is a limit to the size of the circuitry they can handle. As the circuitry grows larger and more complex, a single layer or even double layers are not enough to handle the interconnection between the components. PCB manufacturers in the USA offer designers several advantages with multiple layers for printed circuit boards. These include:
- Better Shielding and Isolation
- Improved Signal Integrity
- Better Power Handling
- Easy to Assemble
A large complex circuitry, when translated onto a single-sided PCB, will need a board with extensive dimensions to accommodate all components and their connections. Even a prototype PCB in the US using a double-sided board will reduce the dimensions to a large extent, but it will continue to remain unwieldy.
For practical purposes, using a multi-layered board from a PCB manufacturer in the USA is more suitable, as the designer can route most of the interconnections between components via intermediate layers, leaving the components on the topmost layer. This method helps to shrink the physical dimensions of the board, while allowing it to retain the complexity of the circuit.
Better Shielding and Isolation
Complex circuits require shielding and isolation to prevent cross-talk and leakage between sections, thereby allowing the board to perform as intended. In single- and double-sided boards, it is possible to isolate sections of the circuit by increasing the physical distance between them, but this tends to increase the overall size of the board.
In multi-layered boards, it is possible to introduce a ground or power layer in between to act as a shield or isolation. The introduction of another layer or layers does not affect the overall size of the board.
Improved Signal Integrity
For PCB boards in the USA carrying high-speed signals, it is important that the signal does not degrade while traveling through the traces on the board. If the impedance of the track does not match that of the signal source and the receiver, the signal can lose its integrity.
For one track or a pair of tracks to maintain a desired impedance, it is necessary to enclose them to form a proper transmission line. PCB fabrication in the USA offering multi-layered boards is the most optimum way of creating a transmission line using adjacent layers.
Better Power Handling
Modern printed circuit boards in the USA, apart from handling high-frequency and high-speed signals, may also have to handle high currents in some tracks. There may also be some electronic components generating substantial amounts of heat. Thermal management is an important factor with miniaturized PCBs to keep them operational without damage.
Printed circuit board manufacturers in the US are offering multi-layered PCBs effective in better handling such power scenarios. Designers use thermal vias to transfer the heat from a hot component to an outer layer of the board for easy heat removal. They may design some layers with heavy copper to carry the extra current. This helps to optimize the cost of the board, as the entire board does not use heavy copper.
Easy to Assemble
Completing the interconnections between components necessary in a complex circuitry translated on to a single- or double-sided board may require several wire jumpers. It may also be necessary to break up the boards into different sections, connecting them via connectors and wire harnesses.
Using a multi-layered PCB board in the USA takes care of the above problems, as the designer can use tracks on various layers for the interconnection. This makes assembly substantially simpler, and reduces the possibilities of errors.
There are several other advantages of using multi-layered printed circuit boards in the USA. Designers can distribute the tracks among the multiple layers resulting in higher precision in track width and spacing. Compared to the single- or double-layered boards, multi-layered boards offer the designer substantially higher flexibility, better control over differential impedance, and better signal integrity.
Applications of Multilayered PCB boards in the US
Higher flexibility in designing multi-layered boards allows OEMs to use them widely in electronic products. PCB fabrication in the USA also offers the advantages of higher stability and more reliable electrical performance. This translates into a better economic performance from the multi-layered boards. With extensive applications of large-scale integrated circuits, users prefer multi-layer boards to promote high-density, high-precision, and high-level digitization in their products. They can easily meet market demands with multi-layered boards facilitating fine and closely spaced tracks, various types of vias like blind, buried, in-pad, and with high plate thickness to aperture ratio. The above features offered by multi-layered printed circuit board manufacturers in the US has resulted in their becoming a preferred option for numerous industries including:
- Consumer Electronics
- Information Technology
- Industrial Electronics
- Medical Applications
- Military, Aerospace, and Defense
- Automotive Industry
- Security Industry
- Science and Research
Applications listed above require equipment with:
- A High Degree of Sophistication
- High Complexity
- High Reliability
- Improved Durability
- High Levels of Safety
- Use of Different Technologies
Only multi-layered printed circuit boards from PCB manufacturers in the US can meet all the above criteria. Most applications must also comply with several international functional, operational, and safety regulations, which is only possible when they are using multi-layered PCB boards from the US of the highest quality.
Several other industries also use multi-layered printed circuit boards from manufacturers in the US as the base for their products. In fact, it is difficult to realize an electronic product without a multi-layered PCB assembly inside. PCB fabrication in the US offers various types of multi-layered PCBs for meeting the requirements of different applications and technologies. These include rigid boards made of glass-epoxy, flexible boards made of Polyimide, metal clad boards with Aluminum backing, high-frequency boards made of Teflon, and many more.