FCBGA Ball Placement Stencil, also called ball mask, is a critical precision tooling for Flip Chip Ball Grid Array advanced packaging. It is used to precisely position micro solder balls and print flux on FCBGA substrates, ensuring accurate ball placement on designated pads, preventing ball missing, bridging or offset defects during mass packaging production.

For high-density FCBGA with ultra-fine pitch, the stencil’s aperture consistency, positional tolerance and flatness directly govern packaging yield. We supply two mainstream manufacturing technologies: chemical etching and nickel electroforming.

• Chemically etched FCBGA stencil: Cost-effective, fast prototyping, suitable for relatively larger pitch ball arrays. It features burr-free profiles and no mechanical stress on the metal sheet.
• Electroformed FCBGA ball placement stencil: Preferred for fine pitch FCBGA. Electroformed nickel stencils deliver ultra-smooth hole walls, minimal surface roughness, excellent dimensional stability, and higher aspect ratio capability, greatly reducing solder ball jamming and residue.

Core Features

1. Micron-level positioning accuracy, custom aperture size and array layout according to Gerber files.
2. Burr-free, stress-free metal sheet, low thermal expansion to avoid substrate alignment deviation.
3. Optional surface nano-coating for better flux release and longer service life.
4. Custom fiducial marks for CCD automatic alignment in high-speed packaging lines.
5. Quick-turn prototyping and mass production support for AI chips, HBM, high-performance processor FCBGA packages.

Applications

• High-performance computing FCBGA chips
• HBM integrated FCBGA packaging
• Automotive semiconductor FCBGA substrates
• Telecom and RF chip advanced packaging
• Custom IC carrier board micro ball placement

Process Advantage

Unlike laser cutting which introduces heat-affected zones, photo chemical etching and electroforming form micro holes without thermal damage. No tooling charge for design changes, ideal for iterative packaging development and low-to-high volume manufacturing.