How to choose a connector

How to choose a connector? There are many kinds of connectors. Common categories include communication interface terminals. Terminal blocks. Wire-to-board connectors. Board-to-board connectors. Each type can be divided into several categories, for example, board-to-board connectors include pin headers and busbars. .Board-to-Board Connectors, etc. ; Wire-to-board connectors include FPC connectors. IDC power sockets. Simple buffalo horns, etc. In the process of selecting a connector, what perspective should we consider the connector that should be used in the appropriate hardware configuration? 1. Pin. Spacing Number of pins. Pin spacing is the main basis for connector model selection. The number of pins chosen depends on the total amount of information that must be accessed. For some patch connectors, as shown in the figure below, the number of patches cannot be too many. During the welding process of the placement machine, due to the continuous high temperature effect, the plastic of the connector will protrude in the middle when thermally deformed, resulting in empty welding of the pins. In the early stage of the development of P800Flash, the microcontroller programmer used this pin header. The mother board was connected to each other, and it was concluded that the sample pin header was soldered on a large scale. After replacing the two pin headers with reduced pin counts, there is no more empty soldering. Now electronic products are developing in the direction of miniaturization. With the development trend of precision, the pin pitch of connectors also starts from 2.54mm to 1.27mm and then to 0.5mm. The smaller the pin spacing, the higher the processing technology requirements. The level of manufacturing technology depends on blindly following the trend and pursuing the perfect small distance 2. Characteristics of electrical equipment The electrical equipment characteristics of the connector mainly include: limiting current, loop resistance, grounding resistance and compressive strength. When connecting high-power resistors, pay attention to the limiting current of the connector; when transmitting high-frequency signals, such as high-frequency signals, such as LVDS.PCIe waiting for signals, pay attention to the circuit resistance. The connector should have low and stable circuit resistance, generally tens of mΩ to hundreds of mΩ. 3. Characteristics of the natural environment The natural environment characteristics of the connector mainly include: high temperature resistance, humidity resistance, salt spray resistance, vibration, shock, etc. Choose according to the actual application scenario. If the application scene is wet and cold, the moisture resistance of the connector. The salt spray resistance is highly specified to prevent the metal material contact points of the connector from rusting. In industrial automation, the impact performance of the connector is required to be high to prevent the connector from falling off under vibration conditions. 4. Physical properties The physical properties of the connector include insertion force, mechanical equipment error proofing, etc. For connectors, the error proofing of mechanical equipment is very important. Once inserted reversely, it is likely to cause irreversible damage to the circuit! Insertion force is divided into insertion force and separation force. Relevant standards include greater insertion force and minimum separation force. From an application point of view, the insertion force should be small and the separation force should be high. Too short a separation force will reduce the stability of the contact, but for connectors that must often be inserted, the separation force exchange will increase the difficulty factor and reduce the service life of the mechanical equipment. In order to reduce the separation force of the connector and make it easier for customers to insert compatible boards, we made a lot of attempts, and finally found a light on the road of exploration, and finally used the connector shown in the figure below, and changed the PCB and commodity case structure. Specifically, this connector has unique specificity, obvious error-proof effect, low insertion strength, moderate separation force, and good hand feeling when inserted, which greatly improves the application convenience of the insert. Connectors, the alias connectors of technical engineers, are used to connect two circuit boards or electronic products to complete the transmission of switching power or information. According to the connector, the modular design of the power circuit can be made, the whole process of the assembly process of electronic equipment can be simplified, and the goods can be facilitated for maintenance and update. For modularly designed power circuits, the choice of connector type plays a crucial role.