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What are the terminal forms and usage requirements of the connector contacts?

source:pogo pin    Popular:pogo pin for moilble phone     release time:2021-10-08 15:20:51     Article author:sznbone

  What are the terminal forms and usage requirements of the connector contacts?

  With the continuous development of electronic technology, the application range of electrical connectors has become wider and wider. The main function of electrical connectors is to realize signal transmission and power transmission between devices, in order to ensure the stability and reliability of electrical connectors. People have been discussing and researching the reliability of the plug-in end of the electrical connector contact piece, often neglecting the reliability of the connection of the connector contact piece tail end. In recent years, in dealing with the quality problems of the whole machine system, it has been found that poor contact and unstable transmission signal are sometimes caused by poor contact of the connector and cable, which mainly manifests as solder joints, wire shedding, and so on. Therefore, to ensure the reliability of the connector in the complete system, not only the inherent reliability of the product, but also the reliability of the product must be ensured.

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  1. Contact end form

  In the    connector, the contact is an important part of the connector, which is mainly responsible for signal transmission. In the connector design, the contact is composed of two parts: the mating end and the tail end. The mating end is generally composed of elastic parts and rigid parts to ensure the reliability of the contact between the connector plug and the socket; the end of the contact is to realize the cable connection between the equipment, the interconnection between the printed boards or the cable and the board. The interconnection between the connectors is used for cable connection. The terminal end of the connector has a welding wire type, a crimping wire type, and an insulation piercing type (IDC, solderless winding type, used on the printed board, the contact end The connection forms are straight welding, bending welding, surface mount and welding-free press-in type.

  2. Design requirements for the end of the contact

  For electrical connectors, electrical connector contacts can be divided into two types, one is the standard type, that is, the contact structure, termination method and wire gauge range are clearly required, and the user can check the product usage when using it. manual.

  The other type is non-standard contact parts, which are designed according to the cable requirements of the whole machine. First, determine the size of the plug-in end, the product installation form, the appearance mode and the cable specification. When the cable cannot be determined, the principle is to design the wiring hole according to the contact part number. The wiring hole should be able to meet the requirements of a larger wire gauge wire. The ratio of the diameter of the core wire of the wire to the inner diameter of the welding cup is generally 0.5-0.7 ; When connecting a wire, the design principle is to match the diameter of the cable core and the connection hole of the contact. The ratio of the diameter of the wire core to the inner diameter of the welding hole is generally 0.6-0.8.

  3. Requirements for use

  In the electronic circuit assembly process, welding technology is an important part. To ensure the reliability of the connection, the following matters should be noted:

  1) Commonly used standards of electronic assembly:

  IPC J-STD-OO1F CN-2014 welding electrical and electronic components requirements should strictly implement welding related standards;

  GB/T 3131 tin-lead solder requirements and test methods;

  GJB 5020-2001 technical requirements for crimp connection.

  2) When cables are soldered, no more than three wires should be inserted in a soldering cup. The multi-strand core wires should be kept clean and should not be broken. All of them should be inserted into the bottom of the soldering cup. The welding seam should be formed along the contact surface. The solder should wet the soldering cup. The entire inside, and at least 75% of the mouth of the cup is filled.

  3) Use the welding barrel type (mainly used for the inner conductor of the coaxial cable), select a suitable welding fixture when welding, and place the object to be welded on the welding fixture. Before welding, the welding part of the inner conductor must be positioned well to ensure that the size of the inner conductor after welding meets the requirements of the drawing. When soldering, first apply a proper amount of flux evenly on the soldering part (respectively use rosin flux), the wires and soldering holes should be tin-lined, and a proper amount of solder wire should be dipped with a 60w electric soldering iron to contact the part of the inner conductor that needs to be soldered. Pull the cable during the process, and the heating time is 3-5 seconds. Finally, remove the electric soldering iron and inspect the soldering quality through the observation hole. The solder must not be higher than the observation hole and there is no solder in the observation hole.

  4) When welding two wires in one welding cup, the sum of the core wire diameters must not exceed 90% of the diameter of the inner hole of the welding cup. When welding three wires, the cross-sectional area of the core wire and the diameter of the outer circle must not exceed 90% of the diameter of the welding cup.

  5) Welding without inserting the core wire of the wire to the bottom of the soldering cup is prohibited: manual soldering, and forced cooling of the solder joints is prohibited.


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