Sn-Plated CuB

Sn-Plated CuB (Tin-Plated Copper Core) Solder Balls represent a sophisticated advancement in interconnect technology, engineered to bridge the gap between superior electrical performance and robust mechanical reliability. At their core lies a high-purity copper sphere, providing exceptional thermal and electrical conductivity. This core is then precisely coated with a uniform layer of tin (Sn) plating, creating a composite structure that combines the best properties of both metals. The result is a solder ball solution ideal for the most demanding Ball Grid Array (BGA) , Chip Scale Package (CSP), and flip-chip applications where joint integrity, low electrical resistance, and consistent reflow behavior are non-negotiable.

The unique construction of Sn-Plated CuB solder balls delivers a set of distinct advantages over homogeneous alloy spheres. The copper core acts as a non-melting pillar during the reflow process, helping to control standoff height and prevent head-in-pillow (HiP) or non-wet open (NWO) defects common in ultra-fine-pitch assemblies. This is critical for maintaining coplanarity in large, dense arrays.

The outer tin plating ensures excellent solderability and forms reliable intermetallic compounds (IMCs) with the substrate pads. A key feature is the customizable tin plating thickness. We offer a range of standard plating options (e.g., 3-5µm, 5-8µm) and can precisely tailor the tin content to meet specific customer requirements for solder joint volume, IMC formation kinetics, or compatibility with different surface finishes (ENIG, Immersion Sn, OSP).

This product excels in applications requiring high thermal cycling performance and resistance to mechanical shock. The copper core's strength reduces the risk of solder joint cracking under stress. Furthermore, the composite structure can help mitigate issues like tin whisker growth compared to pure tin finishes, enhancing long-term reliability for automotive, aerospace, and high-performance computing components.

Available in diameters from 0.1mm to 0.76mm with tight diameter tolerances (typically ±10µm), our Sn-Plated CuB balls ensure consistent printing and placement. They are compatible with standard lead-free (SAC305, etc.) and lead-containing solder pastes, offering design flexibility.

In a market demanding higher reliability and miniaturization, Sn-Plated CuB solder balls offer a engineered solution. They are not just another component but a reliability enhancement for your package. Our manufacturing process ensures exceptional sphericity, low oxidation, and consistent plating quality, supported by full traceability and compliance with RoHS and other relevant industry standards.

Whether you are designing next-generation GPUs, advanced driver-assistance systems (ADAS), or mission-critical communication hardware, our technical team is ready to collaborate. We provide application-specific support and can develop custom tin-plating profiles to optimize performance for your unique assembly process and reliability targets.