Resilient Conductive Bumps for High-Density Probe Testing

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Solution Overview

Problem

Current microelectronic component testing methods face limitations in probe density and risk of damage to components due to off-center probing, leading to defects and reduced manufacturing yield.

Innovation Solution

The development of resilient conductive bumps with compressible polymers and metalized layers that deform upon probe contact and return to their original shape, allowing for higher probe densities and minimizing damage to fragile components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If individually micro-positioned probes are used for testing microelectronic components, then the testing capability is provided, but the probe density and total number of probes are limited

Engineering Contradiction:

Improveprobe densityVSAvoidprobe positioning complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The invention divides the testing system into two functional parts: resilient conductive bumps attached to the microelectronic component and corresponding probes. The bumps are segmented across the component surface to enable multiple simultaneous contact points, increasing probe density without proportionally increasing system complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of positioning multiple complex probes individually, the invention inverts the approach by attaching simple resilient conductive bumps to the component, which then passively engage with probes. This reduces the complexity of probe positioning while maintaining high probe density

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If conventional probing methods are used, then electrical contacts are established, but damage can occur to the component pads due to off-center probing

Engineering Contradiction:

Improvetesting reliabilityVSAvoidpad damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The resilient material is placed beforehand on the conductive pad to act as a cushioning layer. This cushioning effect protects the pad from damage during probing by absorbing mechanical stress and accommodating off-center probe contacts, thereby improving testing reliability

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The resilient conductive bump serves as an intermediary element between the probe and the conductive pad. It mediates the contact by providing a compliant interface that reduces direct mechanical stress on the fragile pad, preventing damage while enabling reliable electrical contact

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If higher probe densities are achieved using component-specific solutions such as cantilever, micro wire, and buckling beam, then probe density increases, but the solutions are expensive and have limited uses

Engineering Contradiction:

Improveprobe densityVSAvoidmanufacturing cost

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The invention changes the physical parameters of the contact structure by using resilient conductive bumps with specific material properties (resilient material combined with conductive material). This simpler construction achieves high probe density at lower manufacturing cost compared to complex cantilever or micro wire solutions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The resilient conductive bump is formed as a composite structure combining resilient material and conductive material. This composite approach provides both mechanical compliance and electrical conductivity in a single integrated element, reducing manufacturing complexity and cost while enabling high probe density

Inventive Principle:

Principle #40Composite materials

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

Enables efficient and damage-free testing of microelectronic components by allowing for higher probe densities and specific material formulations to suit different components, reducing defects and improving manufacturing yield.

Implementation Method 1

The resilient material is configured to return from the deformed shape to an undeformed or otherwise regular shape in response to withdrawal of the test probe contact from the conductive element

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a conductive element on or in the resilient material, the conductive element being coupled to the at least one conductive pad

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20240339365A1Resilient conductive bump for microelectronic testing

Publication Date: 2024.10.10 BAE SYSTEMS INFORMATION ANDELECTRONIC SYSTEMS INTEGRATION INC

AI summary

A microelectronic component includes a substrate having at least one electrical pad, a resilient material on the substrate, and a conductive element on or in the resilient material and coupled to the at least one conductive pad. The resilient material may include, for instance, a compressible polymer. The conductive elements configured to be placed in contact with at least one test probe, where the resilient material is configured to be compressed by the at least one electrical probe into a deformed shape and where the resilient material is configured to return from the deformed shape to a non-deformed shape subsequent to a removal of the conductive element from contact with the at least one electrical probe.