4 Layer Black Oil Solder Mask HDI PCB Circuit Board Laser Drilling Process

HDI PCBs: The Ideal Choice for High-Speed High-Frequency Applications

  HDI PCB (High-Density Interconnect Printed Circuit Board) is a high-performance circuit board with higher connection density, smaller microvias, and finer line widths than traditional PCBs. It uses blind, buried, and stacked vias to save space, supports miniaturized electronic devices, and ensures excellent signal transmission for high-speed, high-frequency applications.

Core Manufacturing Challenges

1. Ultra-fine Line and Space Fabrication :HDI boards require line widths and spaces (L/S) as small as 25μm/25μm or even finer. Controlling undercutting, line discontinuity, and copper uniformity during etching is extremely difficult, as minor process variations can lead to open or short circuits.
2. High-Precision Drilling for Microvias: Microvias (typically ≤150μm in diameter) demand advanced laser drilling or mechanical micro-drilling techniques. Issues like drill breakage, uneven hole walls, and thermal damage to the substrate (especially for laser drilling) are major hurdles, directly affecting interconnection quality.
3. Layer-to-Layer Alignment Accuracy : Multiple stacked layers (often ≥8 layers) require precise alignment, with registration tolerances as tight as ±10μm. Any misalignment between layers can cause microvia misconnection, reducing yield and board reliability.
4. Reliability Control of Stacked/Buried Vias: Stacked or buried microvias need consistent plating thickness (usually ≥20μm) to ensure conductivity and mechanical strength. Voids, poor adhesion, or uneven plating within vias can lead to premature failure under thermal cycling or vibration.
5. Surface Finish and Solderability: Fine-pitch components (e.g., 01005 chips or CSPs) on HDI boards require uniform surface finishes (e.g., ENIG, Immersion Silver). Controlling finish thickness, avoiding oxidation, and ensuring solder joint reliability are critical, as small defects can cause soldering failures.

FAQ:

1.Q:Why choose HDI Printed Circuit Board?

   A:HDI PCBs are the optimal choice because their blind, buried, and stacked vias save valuable space, while their advanced design supports miniaturized electronics and delivers excellent high-speed, high-frequency signal performance.

2.Q:How many layers can your circuit boards provide?

    A:We typically provide 1-30 layer boards, and in special cases, we can stack more layers.

3. Q:Do your circuit boards support customization?

    A:Yes, we support customized designs. You can send us your Gerber files and BOM list, and we will provide you with an accurate quote based on the information and market conditions.

4. Q:What do Gerber files typically contain?

    A:Normally Gerber files Include:PCB Types,Product thickness, Ink color, Surface treatment process and If SMT processing is required, component BOM and tag drawing are also required.
5. Q:What is your minimum order quantity for PCB boards?

    A:Our minimum order quantity is 1 piece(5 square meters),the larger the quantity, the bigger the discount.

6. Q:Do you have relevant certification certificates to support this?

    A:We hold numerous important certifications, including ISO, UL, CE, and RoHS. All products undergo rigorous quality testing.

7. Q:What payment method do you usually use?

    A:For small orders, samples, or urgent payments, we accept Western Union. For large orders, we recommend T/T, which ensures the safety of both parties.

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