Ampacity
When selecting the connector for the power signal, pay more attention to the current carrying capacity of the connector, adopt a derating design, and pay attention to the insulation withstand voltage between the pins.
Structure size
The external dimension of the connector is very important, and there are certain space restrictions for the connection in the product, especially the single-board connector, which cannot interfere with other components. Choose the appropriate installation method according to the use space and installation position (installation includes front installation and rear installation, installation and fixing methods include rivets, screws, collars or quick locking of the connector itself, etc.) and shape (straight, curved, T type, round, square);
Impedance matching
Some signals have impedance requirements, especially RF signals, which have stricter impedance matching requirements. When the impedance does not match, it will cause signal reflection, which will affect signal transmission. Generally, signal transmission has no special requirements on the impedance of the connector.
Shield
With the development of communication products, more and more attention is paid to EMC. The selected connector needs to have a metal shell. At the same time, the cable needs to have a shielding layer. The shielding layer should be connected with the metal shell of the connector to achieve the shielding effect. Using the injection molding method, the plug part is wrapped with copper skin, and the shielding layer of the cable is welded with the copper skin.
Anti-misinsertion
There are two aspects to prevent mis-insertion: one is the connector itself. The connector itself rotates 180 degrees, and the wrong connection leads to wrong connection of signals. At this time, it is necessary to pay attention to choosing an anti-mis-insertion connector as much as possible, or by adjusting the relative position relationship of the connector. Make the assembly unique; on the other hand, in order to reduce the variety of materials, several signals use the same connector, and it may occur that the A plug is inserted into the B socket. At this time, you need to pay attention. If this happens When serious consequences (not simple alarms, destructive) are caused, the A and B interfaces must be selected as different types of sockets (for example, A is male, B is female);
Reliability
Connectors are used to connect signals, so the connection parts should be reliable (for example, surface contact is better than point contact, pinhole type is better than leaf spring type, etc.)
Generality
In the selection process of connectors, it is necessary to choose common materials as much as possible, especially among products of the same series, the selection of connectors has strong versatility, reducing the types of materials, increasing the quantity, reducing costs, and reducing supply risks.
Use environment
When the connector is used in outdoor, indoor, high temperature, high humidity, salt spray, mold, cold and other environments, there are special requirements for the connector.
Plugging frequency
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 connector will decrease. When some signal interfaces need to be plugged and unplugged frequently, when choosing a connector, pay more attention to the plugging and unplugging times of the connector.
Live condition
Depending on whether it is often live or not, choose a pin or female connector.
Considering
In the process of selecting connectors, various factors are not independent and often interact with each other. Therefore, we must comprehensively consider in the process of connector selection and choose the most suitable connector. The quality of the selection will be different at different stages. degree of impact on the product.
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