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Half-hole Design of Circuit Board
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...
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Why most multi-layer circuit boards are even-numbered layers?
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, ...
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Why printed circuit board need impedance control?
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 ...
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How to control circuit board warpage&twist
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 (doubl...
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Grid copper, solid copper. Which one?
What is copper coating? The so-called copper pour is to use the unused space on the PCB as a reference surface and then fill it with solid copper. These copper areas are also called copper filling. The significance of copper coating is to reduce the impedance of the ground wire and improve the anti-interference ability; reduce the voltage drop and improve the efficiency of the power supply; if it ...
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PCB Pad size
When designing PCB pads in PCB board design, it is necessary to design strictly in accordance with relevant requirements and standards. Because in the SMT patch processing, the design of the PCB pad is very important. The design of the pad will directly affect the solderability, stability and heat transfer of the components. It is related to the quality of the patch processing. Then what is the PC...
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Comparative tracking index of PCB
The tracking resistance of the copper clad laminate is usually expressed by the comparative tracking index (CTI). Among the many properties of copper clad laminates (copper clad laminates for short), tracking resistance, as an important safety and reliability index, has been increasingly valued by PCB circuit board designers and circuit board manufacturers. The CTI value is tested in accordance wi...
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PCB Laminating
1. Main process Browning→open PP→pre-arrangement→layout→press-fit→dismantle→form→FQＣ→IQＣ→package 2. Special plates (1) High tg pcb material With the development of the electronic information industry, the application fields of printed boards have become wider and wider, and the requirements for the performance of printed boards have become increasingly diversified. In addition to the performance o...
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Printed Circuit Boards Manufacturing
If you are wondering what exactly Printed Circuit Boards (PCBs) are and how they are manufactured, then you are not alone. Many people have a vague understanding of "Circuit Boards", but really aren't experts when it comes to being able to explain what a Printed Circuit Board is. PCBs are usually used to support and electronically connect the connected electronic components to the board. Some exam...
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