PCB News - Multilayer circuit board gold finger recognition method

Multilayer circuit board gold finger recognition method

The so-called multi-layer circuit board gold finger refers to a row of equidistantly arranged square pads, exposed copper and gold-plated. It is mostly used for electrical connection pins for board cards, LCD connections, motherboards, chassis, etc., because the copper foil nickel-plated layer is plated with a thin layer of gold.

1. The definition and function of multi-layer circuit board gold finger:

Golden Finger: (GoldFinger or EdgeConnector) Insert one end of the PCB circuit board into the connector card slot, and use the connector pin as the outlet of the circuit board to connect to the outside, so that the pad or copper skin is in contact with the pin at the corresponding position. To achieve the purpose of conduction, and plate this pad or copper on the PCB circuit board with nickel and gold, because it is in the shape of a finger, it is called a gold finger. The reason why gold is selected is because of its superior conductivity and oxidation resistance. Sex. But because of the high cost of gold, it is only used for partial gold plating such as gold fingers.

Second, the classification and recognition characteristics of multi-layer circuit boards gold fingers

Gold finger classification of multilayer circuit boards:

1. Conventional gold finger (flush finger);

2. Segmented cheats (intermittent cheats);

3. Long and short golden fingers (ie uneven golden fingers).

Gold finger circuit boards of different lengths

1. Long and short golden fingers (ie uneven golden fingers): rectangular pads with different lengths located on the edge of the board.

2. Segmented golden fingers (intermittent golden fingers): rectangular pads with different lengths located on the edge of the board, and the front section is disconnected;

3. Conventional gold fingers (flush fingers): rectangular pads with the same length and width are neatly arranged at the edge of the board. network cards, graphics cards and other types of physical objects, with more gold fingers. Some small boards have fewer gold fingers ;
Features: No character frame and label, conventional solder mask opening window. Most shapes have grooves. The gold finger of the circuit board protrudes from the edge of the board, or is close to the edge of the board. Some boards have gold fingers at both ends. Normal gold fingers There are two sides, some multi-layer circuit boards have only single-sided gold fingers. Some circuit boards have a wide single gold finger.

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