IC Fuse Cavities Prevent Dielectric Fracture and Regrowth

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Solution Overview

Problem

Conventional integrated circuit fuses are prone to failure due to fracture of the interlayer dielectric structure and regrowth or reconnection issues, leading to shorts and unwanted leakage.

Innovation Solution

A fuse structure with a conductive trace having a fusible portion of higher resistance, accompanied by a dielectric structure and cavities designed to capture debris, where the cavities are positioned to prevent fracture and ensure complete separation upon fusing, thereby reducing the likelihood of dielectric fracture and regrowth.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional integrated circuit fuse is blown, then the fuse opens to interrupt current flow, but the interlayer dielectric structure fractures and debris remains causing regrowth

Engineering Contradiction:

Improvefuse blowing reliabilityVSAvoiddielectric fracture and regrowth

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The dielectric structure is segmented into multiple cavities separated by separation walls, creating isolated chambers that confine debris during fuse blowing. This segmentation prevents debris from bridging across the fuse gap and causing regrowth, while also preventing stress propagation that would fracture the dielectric.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Debris generated during fuse blowing is extracted from the main dielectric structure and confined within dedicated cavities. The separation walls act as barriers that extract and isolate harmful debris particles, preventing them from remaining in electrical contact with the fused portion and causing regrowth.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of manufacture

If the fuse structure is simplified, then manufacturing is easier, but the likelihood of dielectric fracture and regrowth increases

Engineering Contradiction:

Improvefuse fabrication simplicityVSAvoidresistance to dielectric fracture and regrowth

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Cavities and separation walls are formed in the dielectric structure before the fuse blowing operation. This preliminary structuring of the dielectric with pre-formed cavities and separation walls prepares the pathway for debris containment and stress isolation, ensuring reliable fuse operation without requiring complex post-processing or additional manufacturing steps.

Inventive Principle:

Principle #10Preliminary action

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 effectively minimizes the likelihood of dielectric fracture and regrowth, enhancing the reliability of the fuse by ensuring complete separation and debris capture, thus reducing failure rates in integrated circuits.

Implementation Method 1

a conductive trace in a fuse-level metal layer of the integrated circuit, wherein the conductive trace comprises a fusible portion having a higher resistance than other portions of the conductive trace

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS9184012B2Integrated circuit fuse and method of fabricating the integrated circuit fuse

Publication Date: 2015.11.10 ALLEGRO MICROSYSTEMS LLC

AI summary

A fuse formed as part of an integrated circuit has cavities disposed to the sides of the fuse to provide more reliable operation with less chance of re-connection. A method of providing the fuse is also described.