Rotational IC Test Socket Contacts for Low-Wear Scrubbing
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Solution Overview
Problem
Existing test sockets for semiconductor integrated circuits face degradation over multiple cycles due to oxidation, abrasion, and other forms of wear, leading to compromised electrical and mechanical performance and reduced useful life.
Innovation Solution
A test socket design featuring a rotational contact that translates and rotates on an elastomer retainer, providing scrub on the contact pads of the IC while minimizing scrub on the PCB contact of the load board, thus maintaining effective electrical connections and extending the socket's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a test socket is used for multiple testing cycles, then productivity increases, but the contacts and structures degrade due to oxidation, abrasion, compression, and tension
Solution Approach 1:
The contact is designed to rotate dynamically during IC insertion, transitioning from a non-contact state to a contacted state. This rotational movement allows the contact to scrub against the IC contact pad, distributing wear and preventing localized degradation, thereby maintaining reliable electrical connection over multiple testing cycles
Solution Approach 2:
The contact's position and orientation parameters change during operation. By allowing the contact to rotate and adjust its angular position, the system adapts to wear patterns and maintains optimal electrical contact pressure, preventing performance degradation over time
2Reliability
If the rotational contact translates and rotates on the IC contact pad, then contact electrical resistance decreases, but wear occurs on the contact and IC pad
Solution Approach 1:
The rotational scrubbing action, which initially appears harmful due to potential wear, is actually beneficial as it cleans and seats the contact surfaces, reducing contact electrical resistance. The controlled rotation distributes any wear evenly, converting a potentially harmful abrasive action into a useful seating and cleaning mechanism
Solution Approach 2:
The contact performs periodic rotational scrubbing actions during each IC insertion. This periodic motion repeatedly cleans and reseats the contact surfaces, maintaining low electrical resistance over time while the elastomer retainer resets the contact position between cycles
3Stability of the object's composition
If the test socket is mounted to the load board, then mechanical stability improves, but scrub on the PCB contact increases
Solution Approach 1:
The contact system is segmented into multiple functional zones: the rotational contact body that scrubs on the IC pad, the elastomer retainer that provides compliance, and the PCB contact interface. This segmentation isolates the scrubbing action to only the IC contact pad area, preventing wear on the PCB contact while maintaining mechanical stability
Solution Approach 2:
The rotational contact applies localized scrubbing force only at the IC contact pad interface, while the PCB contact interface maintains a different, non-scrubbing interaction. This local differentiation of contact quality allows mechanical stability at the PCB interface while enabling beneficial scrubbing only where needed at the IC pad
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 described test socket solution reduces contact electrical resistance by introducing scrub during IC insertion, while minimizing wear on the load board contacts, thereby enhancing the socket's durability and performance over multiple cycles.
Implementation Method 1
The elastomer retainer is configured to compress under translatory force from the rotational contact when translating from the free state to the pre-load state upon engagement with the load board
Implementation Method 2
The elastomer retainer is configured to compress under rotational force from the rotational contact when rotating from the pre-load state to the loaded state upon engagement with the flat no-leads semiconductor IC
Implementation Method 3
A test socket design featuring a rotational contact that translates and rotates on an elastomer retainer, providing scrub on the contact pads of the IC
Data Source
AI summary
A test socket for an IC includes a socket body, a rotational contact, and an elastomer retainer. The socket body includes a top surface that faces the IC, and a bottom surface that faces a load board. The socket body defines a slot extending from the top surface to an aperture in the bottom surface. The rotational contact is positioned in the slot. The elastomer retainer captures the rotational contact in the socket body and includes a round section about which the rotational contact rotates. The elastomer retainer compresses under translatory force from the rotational contact when translating from the free state to the pre-load state upon engagement with the load board, and compresses under rotational force from the rotational contact when rotating from the pre-load state to the loaded state upon engagement with the IC.