Brief Introduction to Three Basic Performance of Fuwei FPC Connector
The performance of FPC connectors can be divided into three categories: mechanical performance, electrical performance and environmental performance.
1. As far as the function of FPC connector is concerned, the pull-out force is an important mechanical performance of FPC connector. Plugging force is the force of insertion and pull-out, which have different requirements. The maximum insertion force and minimum pull-out force are stipulated in the relevant standards, which indicates that the insertion force is small, and the separation force is too small, which will affect the reliability of contact. Another important mechanical property is the mechanical life of FPC connectors. Mechanical life is a durability index for FPC connectors, which is called mechanical operation in the national standard. It takes one insertion and one pull-out as a cycle, and judges whether the connector can complete its connection function normally after the specified plug-in and pull-out cycle. The Plugging force and mechanical life of FPC connectors with more than 20 times can be guaranteed by NW, which is related to the quality of the coatings on the contact parts and the accuracy of the arrangement of the contact parts. The contact parts are all gold-plated.
2. The main electrical properties of FPC connectors include contact resistance, insulation resistance and electrical strength. High quality electrical connectors should have low and stable contact resistance. The contact resistance of the connector varies from several milliohms to tens of milliohms. Most of the products are kept below 50 milliohms.
(2) Insulation resistance is an index to measure the insulation performance between the contacts of electrical connectors and between the contacts and the outer shell. Its magnitude ranges from hundreds to thousands of mega-ohms. 500M_neptunium products are.
(3) Electrical resistance, or withstand voltage or dielectric withstand voltage, is the ability to withstand rated test voltage between connector contacts or between contacts and shell. Voltage: 250V AC
3. Common environmental properties include temperature resistance, moisture resistance, vibration and shock resistance.
The highest working temperature of the connector is 200 C and the lowest temperature is - 65 C. When the connector works, the current generates heat at the contact point, which leads to temperature rise. Therefore, it is generally considered that the working temperature should be equal to the sum of the ambient temperature and the temperature rise at the contact point. In some specifications, the maximum allowable temperature rise of the connector at rated operating current is specified explicitly.
(2) Invasion of moisture resistance will affect the insulation performance of connection h and corrode metal parts. The constant humidity and heat test conditions are 90%~95% of relative humidity, temperature + 40 + 20 C, and the test time is 96 hours at least according to the product requirements. Alternating humidity and heat tests are more rigorous.
(3) When the salt fog resistant connector works in the environment containing moisture and salt, the surface treatment layer of its metal structure and contact parts may produce electrochemical corrosion, which affects the physical and electrical properties of the connector. In order to evaluate the ability of electrical connectors to withstand this environment, salt spray test is prescribed. The connector is suspended in a temperature controlled test box to form a salt mist atmosphere. Its exposure time is stipulated by the product specifications for at least 48 hours.
(4) Vibration and shock resistance is an important performance of electrical connectors, which is an important index to test the mechanical structure and electrical contact reliability of electrical connectors. There are clear provisions in the relevant test methods. The peak acceleration and the time of electrical continuity interruption should be specified in impact test.
Other environmental performance according to the use requirements, other environmental performance of electrical connectors also have sealing, low pressure and so on.