S-Shaped Press-Fit Pin for Solderless PCB Coupling
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Solution Overview
Problem
Existing semiconductor device packages with press-fit pins face challenges in securely and efficiently coupling to printed circuit boards (PCBs) without soldering, requiring innovative designs for reliable mechanical and electrical connections.
Innovation Solution
The development of press-fit pins with a shaft terminating in a head and a pair of curved arms forming an s-shape, which are rotationally symmetric and have a contact surface to form a friction fit with pin receivers, allowing for secure coupling without soldering, and a method of forming these pins by compressing and deforming the shaft to create the s-shape structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If press-fit pins are used to couple semiconductor packages to PCBs without soldering, then installation efficiency and ease of operation are improved, but mechanical strength and connection reliability may be insufficient
Solution Approach 1:
The pin head incorporates a curved s-shape structure with two curved arms that provide friction fit contact surfaces. This curved geometry enables the pin to deform elastically during insertion, creating a secure friction fit with the pin receiver that maintains strong mechanical connection while allowing easy installation and removal.
Solution Approach 2:
The pin head is designed with elastic deformation capability, allowing it to dynamically adapt during insertion. The s-shape structure enables the pin to deform elastically under insertion force and then recover, creating a secure friction fit that maintains strong connection strength while facilitating easy installation and removal operations.
2Reliability
If traditional press-fit pins are used, then manufacturing simplicity is maintained, but connection reliability and security are insufficient
Solution Approach 1:
The s-shape pin head with curved arms provides reliable friction fit contact surfaces that enhance connection reliability. The curved geometry allows elastic deformation during insertion, ensuring secure engagement with the pin receiver while maintaining manufacturing feasibility through forming processes.
Solution Approach 2:
The pin head is segmented into two curved arms that extend from the shaft, each providing contact surfaces for friction fit engagement. This segmentation allows the structure to achieve reliable connections through distributed contact points while maintaining overall structural integrity and manufacturability.
3Ease of operation
If friction fit design is implemented for easy installation and removal, then ease of operation is improved, but mechanical strength may be compromised
Solution Approach 1:
The elastic deformation capability of the s-shape pin head allows it to dynamically adapt during insertion, creating a secure friction fit that maintains strong mechanical connection. The pin can be easily inserted by deforming the elastic structure, and the same elasticity enables easy removal while maintaining connection strength during normal operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables reliable mechanical and electrical coupling of semiconductor packages to PCBs without soldering, providing a secure friction fit and allowing for easy installation and removal, while minimizing material degradation and stress on the components.
Implementation Method 1
an outer extremity of each arm has a contact surface configured to electrically couple to and form a friction fit with a pin receiver
Data Source
AI summary
A press-fit pin for a semiconductor package includes a shaft terminating in a head. A pair of arms extends away from a center of the head. Each arm includes a curved shape and the arms together form an s-shape. A length of the s-shape is longer than the shaft diameter. An outer extremity of each arm includes a contact surface configured to electrically couple to and form a friction fit with a pin receiver. In implementations the press-fit pin has only two surfaces configured to contact an inner sidewall of the pin receiver and is configured to contact the inner sidewall at only two locations. The shaft may be a cylinder. The s-shape formed by the pair of arms is visible from a view facing a top of the press-fit pin along a direction parallel with the longest length of the shaft. Versions include a through-hole extending through the head.