Here you'll find insights into PCB design, tech trends, assembly issues, and trending topics
in the general news media as they relate to printed circuit board technology.
As experts in the manufacture and assembly of printed circuit boards, we work to make our blog a helpful resource on PCB topics and the industries that we work with, including automotive, consumer electronics, aerospace and many more.
Now that we know that PCBs can provide mechanical support and electrical connections for electronic components, how are these electronic components mounted on the PCB?
In this case, we need to make holes in the board so that the pins can pass through the board to the other side, so the parts are soldered to the other side. Because of this, the front and back sides of the PCB are called the Component Side and the Solder Side.
For the most basic PCB, the components are concentrated on one side, and the wires are concentrated on the other side. Because only one side can be wired, we call this PCB a single panel. Both sides of the double panel can be routed, so the wiring area is twice as large as that of a single panel, making it suitable for use on more complex circuits.
There are many types of surface treatment of circuit boards, which should be selected according to performance and requirements. The following are simple analysis of the advantages and disadvantages of various surface treatments of PCB.
Impedance PCB final test eligibility criteria
Downstream operators usually require PCB manufacturers to do 100% electrical testing, so they will agree with PCB manufacturers on test conditions and test methods. Therefore, both parties will clearly define the following:
As automated test equipment becomes part of the overall electronics assembly process, DFT must include not only traditional hardware usage issues, but also knowledge of test equipment diagnostic capabilities.
The DFT team should be aware of the existing testing strategy. As OEMs turn to relying on more and more CMs, the equipment used varies from plant to plant. Without a clear understanding of the manufacturer's process, too many or too few tests may be used. Existing test methods include:
The schematic design software will be available in ORCAD. The supported Netlist is much more than the industry standard.
Design requirements: The designer must read the schematic diagram in detail, fully communicate with the project engineer, understand the circuit architecture, understand the working principle of the circuit, and clearly understand the layout and routing requirements of key signals.
After the following procedures, the finishing work shall be undertaken by the operator responsible for PCB board testing and repair, unless otherwise arranged. The final installer shall be responsible for reviewing and correcting the reinstallation.
Remarks: The grinding process between silk screen and solder mask may be omitted. It can be soldered first and then screen printed, depending on the substrate.
PCB material are divided into: 94HB, fireproof board (94VO, FR-1, FR-2), semi-glass (22F, CEM-1, CEM-3), and full glass (FR-4).
Via is one of the important components of a multi-layer PCB. The cost of drilling is usually 30% to 40% of the cost of PCB board. Simply put, each hole in the PCB can be called a via.
The film consists of a protective film, an emulsion layer, a bonding film, a film base and an antihalation layer. The main components are silver salt photosensitive materials, gelatin and pigments. Under the action of light, the silver salt can be reduced to the center of the silver core, but it is not dissolved in water. Therefore, it can be suspended in a gelatin state and coated on the substrate. The emulsion also contains a pigment to sensitize. The exposed film is then obtained by actinic action.
The process is as shown below: (PCB/LCD design)-->(CAM system)-->(Gerber file)