How to solve the phenomenon of hanging tin on pin shaft of pogo pin connector and soft coating problem?
The pogo pin connector is a precision connector used in mobile phones and other electronic products. It is widely used in the connection between a mobile phone antenna, a mobile phone battery, and a mobile phone mainboard. The pogo pin connector has a precision spring structure inside.
There are different appearances depending on the application, but in general there is a precision spring structure inside the pogo pin connector. The surface of the product is generally gold-plated, and the unit price of the product is generally about 5 to 1 piece.
1) Needle shaft: The material is generally selected as Becu or SK. Both have advantages and disadvantages. Becu has good conductivity, but lacks hardness and high SK hardness, but it is prone to rust.
2) Spring: It is also very important that SUS SWP, especially now PB free, has more and more products, which directly lead to soft or hardened pins or BGA balls. The original yield was found during the test. High, for the ball or pin material, the yield rate is very poor, the choice of spring pressure is very important, the test environment for the material requirements of the spring is also very strict, high and low temperature test directly affect the working life of the probe.
3) Needle: Choose more materials than general PB materials.
The main reason for the low yield rate is due to the increased impedance of the probe during the test.
The increase in impedance is mostly due to arc wear, coating damage, and tinning of the needle shaft during the test process.