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Select components based on PCB package
A PCB package is a graphical representation of the parameters of various components and chips (such as size, length, width, pad size, etc.), which can be called when drawing a PCB diagram. Therefore, before PCB design, it is necessary to select components through PCB packaging; otherwise, various problems will be encountered during the design process, resulting in a PCB board that has never been used in practice despite the time spent on its design. This article introduces several points to note when selecting components based on PCB package types.
A PCB package is essentially a graphical representation of various parameters (such as size, length, width, pad size, etc.) of components and chips, allowing for easy access during PCB drawing. Therefore, before PCB design, component selection needs to be done through PCB packages; otherwise, various problems will be encountered during the design process, leading to a PCB board that has never been used in practice despite significant design time. Today, let's discuss several points to note when selecting components based on PCB package types.
This mainly discusses the techniques for analyzing and selecting components from both the PCB package and PCB board design perspectives. A PCB package contains a lot of information, including the size of the components, especially the relative positions of the pins and the type of component pads. Of course, when selecting components based on PCB package types, another point to note is to consider the external dimensions of the components.
Pin Position Relationship: This mainly involves matching the actual component pins with the PCB package dimensions and selecting different components based on different components. Although the functions are the same, the PCB packages may be different. We need to ensure the correct size and position of the PCB pads to ensure that the components can be soldered correctly.
First, this includes the type of pads. There are two types: plated through-holes and surface mount types. We need to consider factors such as component cost, availability, component area density, and power consumption. From a manufacturing perspective, surface mount devices are generally cheaper and more readily available than through-hole devices. For our general designs, we choose surface mount components, which not only facilitates manual soldering but also benefits pad and signal connection during troubleshooting and debugging.
Secondly, we must also pay attention to the position of the pads, because different positions represent different positions in the actual components. If we do not arrange the positions of the pads reasonably, there may be a situation where the components are too dense in one area and sparse in another. Of course, a worse situation is that the pads are too close, resulting in too small a gap between the components, making soldering impossible.
Another situation is that we need to consider how to solder the pads. In practice, we often arrange the pads in a specific direction, which makes soldering more convenient.
Component Dimensions: In practical applications, some components (such as polarized capacitors) may have higher clearance restrictions. Therefore, during component selection, we need to consider these factors. At the beginning of the design, we can first draw a basic circuit board frame shape and then place some large or position-critical components (such as connectors) that we plan to use. This allows for a quick and intuitive view of the virtual perspective (unrouted) of the circuit board and can provide a relatively accurate relative positioning of the circuit board and components and component height. This will help ensure that the components are correctly placed in the outer packaging (plastic products, chassis, chassis, etc.) after PCB assembly. Of course, we can also call the 3D preview mode from the tool menu to browse the entire circuit board.
For component selection, in addition to design requirements, products from regular manufacturers must be selected to ensure the realization of the predetermined design goals.
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