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Compared to pin-type D-SUB connectors, socket-type D-SUB connectors offer greater durability and more consistent quality, making them particularly suitable for industrial applications. So what factors need to be considered in the design of socket-type D-SUB connectors? Today, the editor will help you sort it out. I. Heat generation in connectors is an important factor to consider in design. As we all know, U = I^2RT, and this power consumption is primarily converted into heat dissipation. Therefore, with the current I remaining constant, the resistance of the connector becomes a key aspect in design. This resistance R consists of Rc, the contact resistance, and Rw (the resistance inherent in the plug itself). So how can this resistance R be reduced? 1. The elastic connection reliability of the materials used in d-sub connector sockets. Due to the expected lifespan of connectors, it is necessary to ensure reliable contact under various conditions, which requires higher flexibility from the connector materials in order to achieve a reliable and flexible connection. 2. The surface roughness of the plug side of the D-SUB connector for pins: a good surface roughness of the connector results in a larger contact area, which in turn leads to lower contact resistance. A good surface roughness is therefore important for connectors. The electrical performance is better, and it can reduce the risks associated with hot plugging. 3. The electrical conductivity of the connector material. Since the material of this coefficient can determine its own resistance Rw, reducing the resistance will also reduce the power output. 4. Material processing and economics. Due to the great variation in the workability of copper alloys, and in line with the above considerations, copper (phosphor-brass) is commonly used in the market today, as it possesses high electrical properties and good elasticity. Second, connector design validation: To determine what kind of connector design is useful and reliable, you can test the design, and there are several important technical criteria to consider. The verification method can be carried out in the laboratory; two test cities must be available, for the temperature rise test and the surge current temperature rise test. The former can verify that temperature under stable touch conditions does not cause damage, while the latter first checks whether current sudden changes may lead to a connection. Destroy equipment. Typically, connector designs include a BUS BAR; the operating current and operating environment are determined, and then an appropriate wire size is selected for the final materials. Third, the plastic design of the connector: in particular, when the connector requires hot-plugging capability, it is necessary to ensure that the D-sub pins can be inserted into the plastic parallel to one another, and that the hot plug can make instant contact or separation. At this point, the theoretical resistance is infinite, although for a short period of time. However, the heat generated can also cause significant damage to the material. Therefore, it is necessary to ensure that the angle of the plastic plug of the connector is within 3 degrees to ensure smooth insertion and removal. Fourth, the selection of plastic materials for connectors: There are three main plastic materials used for connectors: PBT, PC, and PET. Among them, PBT is commonly used because of its good electrical properties (H.D.T of about 200 degrees), but the impact of shrinkage on the appearance must also be taken into account during design. When a very high terminal holding force is required and the plastic body is very thick, flame-retardant PC (with a H.D.T. of around 140 degrees) can be chosen. For applications requiring very high heat distortion temperatures, PET can be considered flame-retardant (around 240 degrees), but it is more expensive.