DPA-Destructive Physical Analysis
Destructive Physical Analysis (DPA) verifies and documents the quality of device processing steps to avoid defects that will adversely affect performance. By disassembling, testing and inspecting a device, a complete profile can be created to determine how well a device conforms to design and process requirements. A complete DPA program typically consists of a systematic and progressive series of environmental and mechanical tests. In some cases defects revealed in a device can result in rejection of an entire lot of devices.
° External Visual Inspection… to assess overall exterior quality and workmanship.
° Real Time X-Ray Inspection… to nondestructively detect internal defects.
° Particle Impact Noise Detection… to detect loose particles inside a device cavity.
° Hermeticity and Internal Vapor Analysis… to quantify package integrity and internal atmosphere. These test methods may be used to gauge the susceptibility of a device to moisture-related failures triggered by poor sealing processes or internal post-seal out gassing.
° Internal Visual Inspection via Optical Microscopy and Scanning Electron Microscopy (SEM)… to evaluate the quality of passivation, metallization and other die related components.
° Glassivation Layer Integrity… to assess the structural quality of deposited dielectric films over aluminum metalized devices.
° Bond Strength… to measure wire bond strengths and evaluate bond strength distributions.
° Die Shear Strength… to determine the integrity of materials and procedures used to attach die or surface mounted passive elements to package headers or other substrates.