"Die attach" (or "die bonding") is the general term for the process of attaching a semiconductor chip (die) to a substrate or package.
Sintering is an advanced die attach technology that typically uses silver-based paste. By heating the paste--often under pressure--metal particles fuse to form a highly reliable bond. The resulting sintered joint offers superior thermal conductivity and high-temperature stability compared to traditional methods, making it ideal for power semiconductors and bonding dies to DBC substrates.
In contrast, conventional die attach methods often use solder or epoxy adhesives. While effective for standard applications, these materials generally have lower melting points and thermal performance, which limits their suitability for high-power environments.
X-ray inspection systems are essential for quality control in sintering processes. They non-destructively detect internal defects such as voids, cracks, and delamination within the bonding layer. Since these defects impede heat dissipation and can lead to device failure, verifying bond integrity is crucial for ensuring the reliability of power modules.