Shear Test

Shear test is the destructive test that applies lateral force to bonded features such as ball bonds to measure interfacial strength and adhesion quality - it complements pull testing in bond integrity evaluation.

What Is Shear test?

• Definition: Mechanical shear force is applied near bond interface until separation occurs.
• Primary Target: Often used to evaluate first-bond ball adhesion to die pads.
• Result Data: Includes shear force magnitude and observed fracture interface characteristics.
• Inspection Link: Failure morphology indicates metallurgical and process quality at the interface.

Why Shear test Matters

• Interface Validation: Directly measures adhesion quality at critical bond surfaces.
• Defect Detection: Identifies contamination, weak IMC formation, or pad-metallurgy issues.
• Process Control: Sensitive metric for bonding parameter drift and tool wear.
• Qualification Strength: Combined with pull test for fuller mechanical reliability assessment.
• Yield Protection: Early shear failures signal high-risk lots before final release.

How It Is Used in Practice

• Test Standardization: Control shear tool height, speed, and contact position precisely.
• Failure Mapping: Classify fracture types to link results with specific process defects.
• Corrective Loop: Use shear trends to adjust bonding recipes and cleaning procedures.

Shear test is a key adhesion-focused test in bond quality qualification - shear testing provides critical visibility into first-bond interface robustness.