Press-fit technology is the insertion of component connection pins (especially from connectors or single contacts) into the metallized holes of a printed circuit board (PCB). The contact between the press-fit pin and the wall of the hole is gas-tight and characterized by good conductivity. The prerequisite for this is that the press-fit pin has a larger diagonal than the hole diameter on the PCB. The spring-force behavior of the press-fit pin and the printed circuit board creates a positive connection.

Technical Principles and Core Characteristics

  1. Welding-free cold pressing technology

Press-fit (fisheye terminal) achieves reliable connection between electrical contacts and PCB through cold pressing, without the need for traditional soldering process. Its core lies in pressing specially designed terminals into PCB holes slightly smaller than their diameter, and using elastic deformation to form low-impedance, high-reliability mechanical and electrical connections.

Elastic deformation mechanism: The terminal is elastically deformed during the press-in process, forming a close contact with the PCB hole wall, and the clamping force can reach hundreds of Newtons.

Low contact impedance: The deformed contact surface provides a stable conductive path with lower impedance than soldered connections.

stamping

  1. Key structural design

Fisheye terminal: The hollow or solid structure design of the terminal (such as EON/SPS type of CWB) optimizes the mechanical properties through parameters such as crimping area thickness and transition radius.

PCB aperture adaptation: The aperture needs to be precisely controlled (usually 0.05-0.1mm smaller than the terminal outer diameter) to ensure that there is no looseness or overload after crimping.

Application Advantages

  1. Improved production efficiency

Eliminate soldering steps (such as preheating and solder paste printing), simplify assembly process, and reduce labor hours and equipment costs.

  1. Enhanced reliability

High temperature and vibration resistance: Suitable for automotive electronics (such as 125°C environment) and industrial equipment, the connection failure rate is 100 times lower than welding.

  1. Environmental protection and cost optimization

The lead-free process complies with RoHS regulations and reduces the use of hazardous substances.