A compliant pin connection refers to a specific electrical connection or terminal designed to be inserted into a plated through-hole on a PCB. These pins are sometimes called “press-fit pins” or “compliant connector pins.” Compliant pins are typically used in applications requiring a reliable and robust electrical connection.

Here are some critical characteristics of compliant pins in PCB assembly:

  1. Design for Press-Fit: Compliant pins must be press-fit into plated through-holes on a PCB. The pins have a slight interference fit with the holes, which means they are slightly larger in diameter than the holes. This press-fit connection ensures a secure and stable electrical connection.
  2. Elastic Properties: Compliant pins are often made from materials with some elasticity, such as beryllium copper. This elasticity allows the pins to deform slightly when pressed into the PCB holes, creating a tight, gas-tight connection that remains stable even under temperature variations and mechanical stress.
  3. High Reliability: Compliant pins are known for their high reliability, making them suitable for critical applications where consistent electrical performance is essential.
  4. Reduced Soldering: Unlike traditional through-hole components that are soldered to the PCB, compliant pins do not require soldering. This can simplify the assembly process and reduce the risk of solder-related defects.
  5. Applications: Compliant pin connections are commonly used in high-reliability applications such as aerospace, automotive, medical devices, and telecommunications equipment, where maintaining a stable electrical connection is crucial.
  6. Variety of Shapes and Sizes: Compliant pins come in various shapes and sizes to accommodate different PCB designs and requirements. Some may have a cylindrical shape, while others may have a dual-diameter design for better retention in the PCB holes.

Overall, compliant pin connections offer an alternative method for establishing electrical connections in PCB assembly, mainly when soldering is not ideal or long-term reliability is a top priority. Their press-fit design and elastic properties make them a valuable choice in demanding electronic applications.