What issues should we pay attention to when selecting the electrical connector?

There are many manufacturers of electrical connectors at home and abroad, but the selection methods of each one are similar. We focus on the selection criteria of electrical connectors such as current carrying capacity, impedance matching, shielding, versatility, cost and other standards to make some statement, hope it will be helpful for you.

Electrical connector current carrying capacity: When selecting the electrical connector for the power signal, please pay attention to the current carrying capacity of the connector. Use a derating design and pay attention to the insulation withstand voltage between the pins.

Electrical connector structure size: The external dimensions of the connector are very important. There are certain space restrictions in the connection of the product, especially the electrical connectors on the board, which cannot interfere with other components. Choose the appropriate installation method according to the space and installation location (with front and rear installation, rivets, screws, collars or quick locks on the connector itself) and shape (straight, curved, T) Type, round, square).

Electrical connector impedance matching: Some signals have impedance requirements, especially RF signals, which require stricter impedance matching. When the impedance is not matched, it will cause signal reflection, which will affect signal transmission. General signal transmission has no special requirements for the impedance of the electrical connector.

Electrical connector shielding: With the development of communication products, EMC has received more and more attention. The connector is required to have a metal casing, and the cable needs to have a shielding layer. The shielding layer should be connected with the metal casing of the electrical connector. To achieve the shielding effect, the injection method can also be used to wrap the plug part with copper, and the shielding layer of the cable is welded with the copper skin.

The electrical connector prevents mis-insertion: the connector itself rotates 180 degrees, and the misaligned connection causes the signal to be connected incorrectly. At this point, it is necessary to pay attention to selecting the anti-missing plug connector, or to uniquely adjust the assembly by adjusting the corresponding positional relationship of the electrical connector.

Electrical connector reliability: The connector is used to connect signals, so the connection location should be reliable (for example, surface contact is better than point contact, pinhole type is better than leaf spring type, etc.).

Versatility of electrical connectors: In the selection process of connectors, it is necessary to select common objects as much as possible. Especially in the same series of products, the selection of electrical connectors has strong versatility, reducing the types of materials, increasing the number and reducing the cost. Reduce the risk of supply.

Electrical connector environment: When the connector is used outdoors, indoors, high temperature, high humidity, salt spray, mold, cold, etc., the connector has special requirements.

Electrical connector locking function: In order to prevent the connector from falling off when it is mated, to ensure good contact, the connector needs to have a locking function.

Cost of electrical connectors: Cost is also an important factor in the selection process. With the increasingly fierce competition in the market, the appropriate choice of electrical connectors, the cost of the connectors and the processing costs need to be considered comprehensively.

The frequency of plugging and unplugging the electrical connector: the plugging and unplugging of the connector has a certain life. After the number of plugging and unplugging reaches the limit, the performance of the electrical connector will decrease. Some signal interfaces need to be plugged and unplugged when selecting the connector. Pay attention to the number of times the connector is plugged in and out.

Electrical connector charging considerations: Select the pin or hole type connector according to the normal charging or not.

In the process of selecting the connector, the various factors are not independent and often interact. Therefore, we must consider the most suitable connectors in the process of selecting the electrical connector. The quality of the selection will be different at different stages. Affect the product to varying degrees.

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