Several elements of designing sim card connector

Although the sim card connector is only a small connector, many factors need to be considered in designing a sim card connector. Considering these requirements comprehensively, a high-quality sim card connector can be designed.

1. Ampacity: When choosing a connector with power signal, pay more attention to the ampacity of the sim card connector. A derating design should be adopted, and at the same time, attention should be paid to the insulation withstand voltage between the pins.
2. Structural size: The overall size of the sim card connector is very important. The connectors in the product have certain space restrictions, especially the connector on the single board, which cannot interfere with other components, and at the same time reduce the occupied space.

3. Impedance matching: Some signals have impedance requirements, especially radio frequency signals, which have stricter requirements on impedance matching. 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.

4. Shielding: With the development of communication products, EMC is getting more and more attention. The selected connector needs to have a metal shell, and the cable needs to have a shielding layer. The shielding layer should be connected to the metal shell of the sim card connector. To achieve the shielding effect, the injection molding method can also be used to wrap the plug part with copper skin, and the shielding layer of the cable and the copper skin are welded together.

5. Anti-mis-insertion: There are two aspects to anti-mis-insertion: one is the connector itself, the connector itself rotates 180 degrees, misalignment and wrong connection lead to wrong signal connection, at this time, it is necessary to pay attention to choosing an anti-mis-insertion connector as much as possible, or through Adjust the relative positional relationship of the connectors to make the assembly unique; on the other hand, in order to reduce the types of materials, several signals use the same connector. At this time, it may appear that the A plug is inserted into the B plug, and attention should be paid at this time , if such a situation will cause serious consequences (not a simple alarm, but destructive), the A and B interfaces must be selected as different types of sockets (for example, A is male, B is female).

6. Reliability: The sim card connector is used to connect signals, so the connection parts must be reliable (for example, surface contact is better than point contact, pinhole type is better than leaf spring type, etc.)

7. Versatility: In the selection process of connectors, it is necessary to choose common objects as much as possible, especially between products of the same series. The selection of connectors has strong versatility, reducing material types, increasing quantities and reducing costs, while reducing supply cargo risk.

8. Use environment: When the sim card connector is used in outdoor, indoor, high temperature, high humidity, salt spray, mold, cold and other environments, there are special requirements for the connector.

9. Locking function: In order to prevent the connector from falling off during use and ensure good contact, the connector is required to have a locking function.For example, the SCC016 sim card connector produced by our company, which replaces the 91228-3001 of Molex, has a card locking function and can be used in vibration environments.

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

11. Plugging frequency: The plugging and unplugging of connectors has a certain life span. 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, it is necessary to pay more attention to the connection when selecting the connector. The number of plugging and unplugging of the device.

Comprehensive consideration: In the process of selecting connectors, various factors are not independent and often interact with each other. For the requirements of customers for various types of products, CARDCONN has a professional technical development team and has mature manufacturing processes and equipment configurations , can meet the needs of customers to the greatest extent, and welcome customers to consult.