Press-Fit technology offers an inherently reliable, solder-free, lead-free and automation-friendly method that provides the high-current capability and design flexibility required for a wide range of applications in many industries.
In recent years, Press-Fit technology has gained traction with an increasing number of manufacturers by enabling new designs to exhibit very consistent performance and higher reliability than traditional solder joints.
Press-Fit Technology
In engineering terminology, press fit (also known as interference fit) refers to the tightening of two parts by normal force, friction and cold welding. When a shaft is tightly inserted into a slightly smaller hole in another part, the interference fit holds the two parts in place.
Today, press-fit technology is widely used in the manufacture of electronic and electromechanical components. Using press-fit technology, manufacturers are able to create highly reliable electromechanical interconnects without the use of solder. This is accomplished by inserting specially stamped terminals into plated-through-holes (PTH) on printed circuit boards.
Let's take an in-depth look at this technology.
A Closer Look
Press-fit interconnects function similarly to the pair of blades and sockets commonly found in connectors, except for the gender.
In a traditional blade and socket, the socket has a flexible beam that provides the normal force required for an electrical connection, while the blade is rigid. Conversely, in a press-fit connector, the press-fit pins are the "blades" with flexible beams, while the PTH is the "socket" that remains rigid.
The normal force in a crimp connection is the force exerted on the PCB hole wall by the spring characteristic of the crimp pin. The insertion force is the reaction force exerted on the pins when they are inserted into the printed circuit board.
Although both press-in connectors and their blade and socket cousins utilize a pressure connection, the similarities are only minor. Blades and sockets can be inserted and removed multiple times, so they are designed to have a low normal force (making them easy to insert) and an insulating enclosure around them that, among other things, ensures that the connection stays intact during use.
Press-in fittings, on the other hand, are used for more permanent connections that require reliable electrical and mechanical connections without a housing. As a result, their normal force is much higher.
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