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What Is a ZIF Socket?

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  • Written By: G. Wiesen
  • Edited By: Heather Bailey
  • Last Modified Date: 07 November 2016
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    Conjecture Corporation
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A ZIF socket is a type of socket used to connect a central processing unit (CPU) to a computer motherboard and reduce the potential for CPU damage during installation. Older sockets used a connection method by which a great deal of force was needed to install the CPU onto the motherboard, which created the potential for the connector pins on the CPU to be bent or damaged. Removal of a CPU from these sockets also presented challenges and opportunities for further damage. A ZIF socket utilizes a system by which the CPU can be installed with no force being exerted on it, greatly reducing the potential for damage.

Also called a zero insertion force socket, the ZIF socket was first developed by Intel® but similar socket styles have been utilized by numerous manufacturers. The CPU is connected to a computer’s motherboard, and both components are vital to computer functionality. Older motherboard sockets into which CPUs were installed typically required that the connector pins of the CPU were pushed fairly hard into the motherboard socket. CPU connector pins are quite small and thin, and the force used to install the CPU into sockets prior to the ZIF socket could easily damage these pins.

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A ZIF socket, however, is designed to make insertion and removal of a CPU easier and less likely to cause damage to the CPU. Prior sockets designed to reduce insertion force were often flawed since the reduced force also frequently led to reduced contact between the CPU and the socket, which could negatively impact the computer’s performance. A ZIF socket is designed with a mechanism that effectively opens and closes the socket connections around the pin connectors of a CPU.

Installation of a CPU into a ZIF socket is quite simple. A small arm on the socket can be raised and lowered, opening and closing the receiving connectors within the socket. This arm is raised and the connectors opened, at which point the CPU can be inserted onto the socket. The weight of the CPU itself is typically all the force required to effectively connect it to the motherboard. Most CPUs are designed with a slightly irregular connector pin pattern, to ensure the CPU is installed onto the motherboard with the proper orientation.

Once the CPU is inserted into the ZIF socket, then the arm is lowered and the socket connectors close around the connector pins of the CPU. This creates a firm connection which allows the CPU and motherboard to function properly and prevents the CPU from coming loose or falling off of the motherboard. Removal of the CPU is just as easy: the arm is raised, releasing the pins, and the CPU is removed from the socket. These sockets are typically used for home computers, as many professional systems are built with the CPU soldered onto the motherboard to create a permanent and precise connection.

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