Understanding Gold Fingers In PCB

　　The gold finger possess excellent electrical conductivity, ensuring efficient signal and current transmission. Additionally, it offer strong corrosion resistance, effectively withstanding oxidation and corrosion. Lastly, they exhibit robust mechanical strength, capable of enduring insertion, removal, and pressure.

Type of Gold Fingers

　　•General Gold Finger
　　Horizontal or even array, finger pads have the same length and width.

　　•Long-and-Short Gold Finger
　　Finger pads are the same width but different length.

　　•Segmentation Gold Finger
　　The length of the segmented gold fingers varies and disjointed.

Design of Gold Fingers

　　•Plating through holes should be away from gold finger.
　　•For PCB boards that need to be inserted and removed frequently, gold fingers generally need to be plated with hard gold to increase the wear resistance of gold fingers.
　　•Chamfer for the gold finger, generally 45°, other angles such as 20°, 30°, etc.
　　•Delete the soldermask dams between gold fingers, and build a whole soldermask opening for them.

Function
　　Firstly, they are used to connect circuit boards with other electronic components such as sockets, connectors, and chips, ensuring reliable electrical connections. Secondly, PCB gold fingers are utilized for signal and current transmission. They serve as input-output interfaces for circuit boards, enabling the transfer of signals and current between electronic components and the circuit board.

Application fields
　　PCB Gold Fingers are essential in various electronic devices. They are widely used in mobile phones for SIM card slots and battery connectors, in computers for memory and expansion card slots, and in automotive electronics for dashboards, audio systems, and navigation systems.