- Edge connector
An edge connector is the portion of a
printed circuit boardconsisting of traces leading to the edge of the board that are intended to plug into a matching socket.
An edge connector socket, often popularly referenced simply as a slot, is any type of female
electrical connectorfor use with printed circuit boards having matching edge connectors. They consist of a plastic "box" open on one side, with pins on one or both side(s) of the longer edges, sprung to push into the middle of the open center. Connectors are often keyedto ensure the correct polarity, and may contain bumps or notches both for polarity and to ensure that the wrong type of device is not inserted.
The opposite side of the socket is often an
insulation-piercing connectorwhich is clamped onto a ribbon cable. This can be seen inside a personal computeras the connection to a floppy drive. (5.25" floppy drives actually used an edge connector, while 3.5" drives use a pin connector instead, but both typically use the same insulation-piercing connector to the ribbon cable on the back of the connector.) The other side may also be soldered to a motherboardor daughtercard. This is seen inside every PC for connecting expansion cards and computer memoryto the system bus. Slot 1and Slot Awere also commonly-used at one point, the processor being mounted on a card with an edge connector, instead of directly to the motherboard as before and since.
The edge connector is a money-saving device because it only requires a single discrete female connector (the male connector is formed out of the edge of the PCB,) and they also tend to be fairly
robustand durable. They are commonly used in computers for expansion slots for peripheral cards, such as PCI, PCI Express, and AGPcards.
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