Why Is Card Edge Connector Called “Goldfinger“?

PublishTime： 2023-10-01 Article Source：Greenconn News

This is not about the famous 007 movie "Goldfinger", but rather about a card edge connector. It is a method of connecting two PCB cards and is commonly known as "gold finger" because the surface of the PCB terminal is coated with gold or copper, which looks like a finger.

Card edge connectors are widely used and easy to use. Its gold plating layer is generally 0.8μ half gold plating (contacts are gold plated), or full gold plating (the entire terminal including the pins are gold plated). The thicker the gold plating, the better the anti-oxidation ability.

There are several types of card edge power connectors: Standard (SEC), SEC-II, Multi-Beam, and the newer High-Density Card Edge (HDCE).

SEC-II Card Edge Connector
It is a product that replaces the standard SEC and is a high-current printed circuit board power connector with a current rating of 160 amps per linear inch. Compared with the traditional SEC, SEC-II improves the contact design to achieve more efficient current transmission. At the same time, the vented housing design can ensure contact heat dissipation, improve its operational safety and reliability, support continuous long-term operation of the connector, and meet the connection needs of power industry customers.

Multi-Beam Power Card Edge Connector
It is a card edge product after SEC-II and can provide good current and signal density for data communication and industrial applications. This owes to the use of 1.00mm signal terminal spacing and 7.26mm power terminal spacing, which respectively save up to 60% and 30% of space compared to existing products, providing higher flexibility for the structure and design of printed circuit board (PCB), and supporting higher power for each terminal, which can be up to 43A.

High-Density Card Edge Connector
It is one of the highest current density power connectors on the market supporting large power applications. This connector can achieve a higher current (25A/terminal) with low resistance and can support 1500-2000W power for data center equipment. The HDCE connector improves the performance of previous generations of card edge connectors, with a maximum operating temperature of up to 130°C and reliable performance in harsh environments. The 1.27mm industry-standard signal spacing enables it to match mainstream circuit board designs on the market. The elasticity of the power/signal pins provides lower insertion and extraction forces.

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