How to choose the right material for HDI PCB

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High-density interconnect technology (also called HDI technology) has gained market acceptance because many electronic designers have recently attempted to do so. Note that HDI will double the sales of traditional lines in line with recent market trends. In general, all electronics designers need to choose the right HDI PCB material, regardless of the application they create. Choosing the right hardware for HDI is especially important because it works with lightweight, small and powerful PCBs. Often the distance is less than 8 mils (equivalent to 200 µm), but the opening is usually less than 10 mils (equivalent to 250 µm).
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1. What is an HDI stack? This section gives a brief introduction to the definition of an HDI stack and its importance in determining its performance.
2. Dielectric properties of materials considered before selection:
This section explains that the best performance of HDI depends on the right choice of dielectric material and presents it from the following perspectives:
2.1: Decomposition temperature (Td)
2.2: Glass transition temperature (Tg)
2.3: Thermal expansion coefficient (CTE)
2.4: Delay time
3. What are the requirements for HDI flexible PCB? This section mainly lists the technical requirements for HDI Flexible PCB Technology from the following subsections:
3.1: Dimensional stability of flexible materials
3.2 Adhesive liquid control by coating
3.3 Thin and thin copper foil
3.4 Resistance of the material to electron transfer from the binder

4. Different HDI materials can be used for each type. This section focuses on low loss factor (Df) or dielectric PCB circuits, primarily to reduce energy loss at high frequencies. For this reason, at least four types of HDI media are suitable. See the next section.
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4.1: Moderate speed and loss
Currently, these are the most popular PCB materials. They belong to the FR-4 family. Since the relationship between dielectric constant and frequency response is not uniform, dielectric loss increases. Therefore, it is only useful in analog or digital applications that do not require high GHz.
4.2 High speed, low loss
HDI materials in this class include DK. The frequency curve is more fluid. As a result, dielectric losses of up to half the value of medium speed materials are significantly reduced. Applications with requirements near 0 GHz are more convenient.
4.3 High speed, low loss, high signal integrity
DK-curve. The frequency is constant and the dielectric loss is very small. Another advantage is that it eliminates unwanted electrical noise that is common with other types of materials.
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4.4 High speed, low loss, high signal integrity, RF and microwave
Of all HDI materials processed, this type of curve is the smoothest. Also, dielectric loss is minimal. This material category is ideal for applications with requirements up to 20 GHz.
5. Operating costs of HDI materials
Basically, materials with lower Dk and Df values ​​with good SI properties are the best choice for good HDI performance. Also, the higher the quality of the required materials, the more money you can spend. In general, high speed, low loss, high signal integrity, high frequency, microwave are the most expensive classes.
6. Where can I find materials suitable for HDI?
You can order directly from Amazon and access from the entrance.
7. The future of HDI PCB based on the latest market trends
HDI can really improve, but its benefits and uses are endless. HDI PCBs are currently used in almost every field, including the military, and their acceptance is increasing.
8. Conclusion
HDI technology is evolving rapidly around the world and has many uses. However, choosing the right dielectric material is a difficult task. Before making a selection, there are several factors to consider. This article will try to help you. Hope this information helps.