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  • Ceramic PCB Board
    • October 20. 2021

    Ceramic circuit boards are actually made of electronic ceramic materials and can be made into various shapes. Among them, the ceramic circuit board has the most outstanding characteristics of high temperature resistance and high electrical insulation. It has the advantages of low dielectric constant, low dielectric loss, high thermal conductivity, good chemical stability, and similar thermal expan...

  • Different Material of Circuit Board
    • October 13. 2021

    The combustibility of a material, also known as flame retardancy, self-extinguishing, flame resistance, flame resistance, fire resistance, flammability and other combustibility, is to assess the ability of the material to resist combustion. The flammable material sample is ignited with a flame that meets the requirements, and the flame is removed after the specified time. The flammability level is...

  • A&Q of PCB (2)
    • October 08. 2021

    9. What is resolution? Answer: Within a distance of 1mm, the resolution of the lines or spacing lines that can be formed by the dry film resist can also be expressed by the absolute size of the lines or spacing. The difference between the dry film and the resist film thickness The thickness of the polyester film is related. The thicker the resist film layer, the lower the resolution. When the ligh...

  • PCB SURFACE FINISHING, ADVANTAGES AND DISADVANTAGES
    • September 28. 2021

    Anyone involved within the printed circuit board (PCB) industry understand that PCBs have copper finishes on their surface. If they are left unprotected then the copper will oxidize and deteriorate, making the circuit board unusable. The surface finish forms a critical interface between the component and the PCB. The finish has two essential functions, to protect the exposed copper circuitry and t...

  • A&Q of PCB, Why solder mask plug hole?
    • September 23. 2021

    1. Why is the BGA located in the solder mask hole? What is the reception standard? Re: First of all, the solder mask plug hole is to protect the service life of the via, because the hole required for the BGA position is generally smaller, between 0.2 and 0.35mm. Some syrup is not easy to be dried or evaporated, and it is easy to leave residues. If the solder mask does not plug the hole or the plug...

  • Half-hole Design of Circuit Board
    • September 16. 2021

    The metalized half-hole means that after drill hole (drill, gong groove), then the 2nd drilled and shaped, and finally half of the metalized hole (groove) is retained. In order to control the production of metal half-hole boards, circuit board manufacturers usually take some measures due to process problems at the intersection of metallized half-holes and non-metallized holes. Metallized half-hole...

  • Why most multi-layer circuit boards are even-numbered layers?
    • September 08. 2021

    There are single-sided, double-sided and multi-layer circuit boards. The number of multi-layer boards is not limited. There are currently more than 100-layer PCBs. The common multi-layer PCBs are four layer and six layer boards. Then why do people have the question "Why are PCB multilayer boards all even-numbered layers? Relatively speaking, even-numbered PCBs do have more than odd-numbered PCBs, ...

  • Why printed circuit board need impedance control?
    • September 03. 2021

    Why printed circuit board need impedance control? In the transmission signal line of an electronic device, the resistance encountered when the high-frequency signal or electromagnetic wave propagates is called impedance. Why do PCB boards have to be impedance during the manufacturing process of the circuit board factory? Let us analyze from the following 4 reasons: 1. The PCB circuit board of the ...

  • How to control circuit board warpage&twist
    • August 30. 2021

    Warping of the battery circuit board will cause inaccurate positioning of the components; when the board is bent in SMT, THT, the component pins will be irregular, which will bring a lot of difficulties to the assembly and installation work. IPC-6012, SMB-SMT Printed circuit boards have a maximum warpage or twist of 0.75%, and other boards generally do not exceed 1.5%; the allowable warpage (...

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