The inspection capabilities of SMT X-ray inspection equipment:
1. Advanced Semiconductor & Component Level Inspection
Beyond basic visibility, SMT X-ray inspection equipment are critical for identifying internal structural integrity in high-density components.
BGA, CSP, and Flip-Chip: Detailed analysis of solder ball diameter, circularity, and placement. Detecting “Head-in-Pillow” (HiP) defects and internal bridging.
QFN/QFP and Fine-Pitch Leads: Inspection of “toe” and “heel” fillets and detecting solder splashing under the component body.
Wafer-Level Packaging (WLP): Identification of micro-cracks, TSV (Through-Silicon Via) integrity, and bumping defects.
Die Attach & Encapsulation: Assessing the uniformity of epoxy/adhesive layers and detecting delamination or air bubbles in TPU and plastic encapsulations.
2. Electromechanical & Passive Component Analysis
X-ray allows for the inspection of internal “blind” features that optical systems cannot reach.
Sensors & MEMS: Verifying the alignment of internal diaphragms, moving parts, and micro-mirrors without breaching the hermetic seal.
Capacitors & Resistors: Detecting internal dielectric layers, electrode alignment, and termination integrity in MLCCs.
Fuses & Heater Wires: Inspection of the continuity and gauge of internal elements to prevent “open circuit” failures in thermal management systems.
Optical Fiber & Probes: Ensuring precise core alignment and detecting micro-fractures in the cladding or connector ferrules.
3. High-Precision Interconnects & Welding
X-ray is the gold standard for non-destructive testing (NDT) of metal-to-metal bonds.
Metal Weldments & Solder Joints: Measuring penetration depth, porosity, and structural fusion in critical mechanical joints.
Wire Bonding: Detecting “sweep” (deformation of gold/aluminum wires) during the molding process and verifying bond pad contact.
Probe & Connector Pins: Checking for pin deformation, plating thickness consistency, and seating depth in high-density connectors.
4. Quality Control & Traceability Features
Modern AXI (Automated X-ray Inspection) systems integrate data processing with imaging.
Volumetric Voiding Calculation: Automated calculation of voiding percentages against IPC standards to ensure thermal and electrical conductivity.
Dimensional Metrology (Metal Height): Precise Z-axis measurement for component height, solder paste volume, and heat sink standoff.
Automated Traceability (QR/Barcode): Integrated scanners link X-ray inspection images directly to the serial number of the PCBA for 100% data traceability.
