OETECH Bump3D Advanced 3D Optical Automatic Inspection System for Semiconductor Bump Metrology
| Brand | OETECH |
|---|---|
| Origin | Japan |
| Model | Bump3D |
| Detection Speed | 5 WPH |
| Minimum Line Width/Spacing | 20 µm |
| FOV Options | 13×13 mm to 41×33 mm |
| XY Positioning Accuracy | 1.4–3.0 µm |
| Z Range | 30–4000 µm |
| Minimum Bump Diameter | 10–100 µm |
| Minimum Bump Pitch | 20–200 µm |
| Optical Architecture | Multi-Beam Confocal Sensor with Rotating Glass Disc Z-Scanning |
Overview
The OETECH Bump3D is a high-precision, non-contact 3D optical metrology system engineered specifically for post-bump formation inspection in advanced semiconductor packaging processes—including flip-chip, wafer-level CSP (WLCSP), and 2.5D/3D IC integration. It employs a proprietary multi-beam confocal imaging architecture to perform simultaneous, real-time height, coplanarity, and diameter measurements of solder bumps, copper pillars, and microbumps on wafers, interposers, and substrates. Unlike conventional single-beam confocal or interferometric systems, the Bump3D eliminates mechanical Z-axis scanning by leveraging an optically encoded Z-scan mechanism—rotating a multi-thickness glass disc in the illumination path to shift focal planes at sub-millisecond intervals. This enables full 3D topography acquisition without stage motion latency, delivering metrological-grade repeatability (σ < 0.15 µm) under production-line throughput constraints.
Key Features
- Multi-beam confocal sensor with >3 million pinhole-equivalent detection points—enabling parallel acquisition across entire fields of view without raster scanning
- Dual optical configurations: Non-Scanning System (NCS) for high-speed inline inspection (up to 5 wafers per hour), and Scanning Confocal System (SCS) for enhanced lateral resolution and sub-µm vertical sensitivity
- Rotating glass disc Z-scanning technology—replaces piezo-driven or motorized Z-stages, eliminating hysteresis, wear, and thermal drift while achieving effective Z-step resolution down to 10 nm
- Modular FOV support from 9.9×7.4 mm to 41×33 mm—scalable to 300 mm wafers with automated tile stitching and fiducial-based registration
- Integrated vibration-isolated granite base and active air-damping optics platform—ensuring measurement stability in fab environments with ambient floor noise ≤ 2 µm/s RMS
- Real-time coplanarity analysis per die using ISO 21920-1 compliant algorithms, with statistical process control (SPC) output compatible with factory MES interfaces
Sample Compatibility & Compliance
The Bump3D supports bump types including SnAg, SAC305, Cu/Ni/Sn, and electroplated Cu pillars ranging from 10 µm to 200 µm in diameter and 20 µm to 200 µm pitch. It accommodates bare silicon, glass, organic substrates (ABF, BT), and ceramic carriers with reflectivity ≥15% in the 405–660 nm spectral band. All measurement protocols adhere to SEMI D39 (Wafer Bump Metrology), JEDEC JESD22-B111 (Coplanarity Test Methods), and ISO/IEC 17025-accredited calibration traceability via NMIJ (National Metrology Institute of Japan). System software maintains full audit trail functionality compliant with FDA 21 CFR Part 11 for electronic records and signatures in regulated packaging lines.
Software & Data Management
The Bump3D Control Suite v4.2 provides intuitive workflow configuration via drag-and-drop recipe builder, supporting multi-layer inspection plans (e.g., coarse-height map → fine-resolution coplanarity → outlier bump classification). Raw intensity and depth maps are stored in HDF5 format with embedded metadata (timestamp, tool ID, operator, lot ID, calibration epoch). Statistical summaries—including Cpk, Ppk, max-min height deviation, and vector-based coplanarity vectors—are exportable to CSV, XML, or directly to Siemens Opcenter, Applied Materials EnduraLink, or generic OPC UA servers. Optional GLP/GMP modules provide role-based access control, electronic signature enforcement, and change-controlled software versioning aligned with ICH Q9/Q10 principles.
Applications
- Pre-assembly bump height uniformity screening prior to flip-chip bonding
- Coplanarity verification of redistribution layer (RDL) bumps on fan-out wafer-level packages (FOWLP)
- Post-reflow bump geometry validation for Cu pillar stacks in HBM2E and HBM3 memory stacks
- Process development feedback for electroplating bath chemistry optimization and mask alignment tuning
- Failure analysis correlation with X-ray CT and cross-sectional SEM datasets via coordinate-matched overlay
- Qualification of advanced bump architectures—including hybrid Cu/SnAg microbumps and anisotropic conductive film (ACF)-compatible structures
FAQ
What is the maximum bump density supported per field of view?
Up to 12,000 bumps/mm² at 10 µm pitch, depending on selected FOV and optical configuration.
Does the system require periodic recalibration with physical standards?
Yes—traceable Z-height calibration using NIST-traceable step-height artifacts is recommended every 12 months or after major maintenance; XY calibration is performed automatically using onboard fiducials before each run.
Can the Bump3D integrate with existing SECS/GEM host systems?
Yes—standard SECS/GEM interface (HSMS over TCP/IP) is included, with configurable event reporting for inspection pass/fail, tool status, and alarm conditions.
Is the rotating glass disc mechanism subject to wear or lifetime limitations?
No—solid fused silica disc with DLC-coated bearing interface is rated for >10⁸ rotations (>5 years continuous operation); no consumables or scheduled replacement parts are required.
How does the system handle highly reflective or low-reflectivity bump surfaces?
Adaptive illumination gain control and polarization-sensitive detection channels dynamically optimize signal-to-noise ratio across Al, Ni, Cu, and Sn-based bump finishes without user intervention.
