Silver-Filled Epoxy
Silver-filled epoxy is the conductive die-attach adhesive containing silver particles in epoxy matrix to provide bonding strength and thermal conduction - it is widely used in power and analog package assembly.
What Is Silver-filled epoxy?
- Definition: Polymer adhesive system loaded with silver filler for enhanced conductivity and heat transfer.
- Process Use: Dispensed or printed before die placement, then cured to form structural bondline.
- Key Properties: Viscosity, filler loading, cure kinetics, and modulus define processability and stress behavior.
- Package Scope: Common in leadframe packages and power devices requiring improved thermal paths.
Why Silver-filled epoxy Matters
- Thermal Dissipation: Silver filler improves heat conduction compared with non-conductive epoxies.
- Assembly Flexibility: Cure-based process can be integrated with moderate-temperature package flows.
- Electrical Utility: In some structures, conductive path supports grounding or backside electrical needs.
- Reliability Sensitivity: Void content and cure quality strongly affect long-term attach integrity.
- Cost and Throughput: Well-optimized systems support high-volume production with stable quality.
How It Is Used in Practice
- Dispense Optimization: Control dot volume and placement to achieve uniform spread without bleed.
- Cure Profile Tuning: Set thermal recipe for complete conversion while limiting stress buildup.
- Quality Verification: Monitor voiding, die shear strength, and thermal resistance lot by lot.
Silver-filled epoxy is a mainstream conductive adhesive option for die attach - silver-epoxy performance depends on balanced material control and cure discipline.