Electronic Assembly Failure Analysis

Scope

Failure analysis of electronic assemblies covers the investigation of failed or degraded electronic components and assemblies across the full spectrum of failure modes – electrical, mechanical, thermal, and chemical. The scope extends from individual passive components and ICs through to populated PCBs, solder joints, connectors, and complete assemblies.

The analysis scope typically includes:

• Non-destructive evaluation (NDE) – visual inspection under optical microscopy, X-ray radiography (2D and CT), acoustic microscopy (C-SAM), and electrical characterization to document and locate the failure before any physical intervention
• Electrical fault isolation – curve tracing, in-circuit testing, time-domain reflectometry (TDR), and liquid crystal hot spot detection to localize the fault to a specific net, node, or component
• Physical and chemical analysis – cross-section preparation and SEM/EDS analysis of solder joints, intermetallics, bond wires, and die surfaces; XRF for material identification; FTIR for contamination or polymer identification
• Decapsulation and die-level analysis – chemical or laser decapsulation of IC packages to expose the die for optical and electron microscopy examination of bond wires, metallization, and die surface features
• Failure mode classification – identification and documentation of the failure mechanism (e.g., electromigration, solder fatigue, CAF, delamination, EOS/ESD damage, corrosion, intermetallic growth, voiding)

Applications

• PCB and solder joint failures – investigation of open circuits, intermittent connections, solder bridging, cold joints, and solder joint fatigue cracking in surface mount and through-hole assemblies
• Component failures in the field – root cause investigation for ICs, capacitors, resistors, connectors, and other components that fail during customer use, with findings used to support corrective action or supplier claims
• Manufacturing process defects – identification of assembly process issues including insufficient solder, tombstoning, pad cratering, PCB delamination, or contamination-related failures introduced during reflow, wave soldering, or cleaning
• EOS and ESD damage – characterization of electrical overstress and electrostatic discharge damage in semiconductor devices, including identification of damage signatures that distinguish EOS from ESD
• Reliability test failures – analysis of assemblies that fail during accelerated life testing (thermal cycling, humidity, vibration) to determine whether the failure is driven by design, material, or process
• Counterfeit component investigation – examination of suspected counterfeit parts using surface analysis, marking verification, X-ray, and die-level inspection to confirm or refute authenticity
• Warranty and field return analysis – structured failure investigation to support warranty decisions, supplier disputes, or design change justifications

Benefits

• Identifies the actual root cause rather than just the failure location – knowing where something failed is not the same as knowing why; a proper failure analysis traces the failure mechanism back to its origin, whether that’s a design margin issue, a process parameter, or a material substitution
• Prevents recurrence – findings from a well-documented failure analysis give engineering and quality teams the specific information needed to change a process, update a specification, or redesign a component interface
• Supports supplier accountability – failure analysis data that isolates a defect to incoming material or a vendor-supplied component provides the technical basis for a supplier corrective action request or warranty claim
• Non-destructive techniques preserve evidence – starting with X-ray and electrical characterization before any physical intervention ensures the failure evidence is documented and not inadvertently destroyed during investigation
• Cross-disciplinary approach covers the full failure space – electronic assembly failures rarely have a single cause; combining electrical, mechanical, and chemical analysis in one investigation ensures nothing is missed