Tinned Copper (CuSn) Wire is a high-conductivity copper wire coated with a thin layer of tin to improve its corrosion resistance, solderability, and overall durability. This combination of materials offers superior electrical performance and mechanical reliability, making it an essential material for electrical, electronic, and industrial applications (Koike & 小池健志, 2009).
Material Overview
Physically, tinned copper wire maintains the excellent electrical and thermal conductivity of pure copper while gaining additional protection from the tin coating. The tin layer enhances oxidation resistance, abrasion resistance, and heat tolerance, ensuring stable performance even under demanding environmental and thermal conditions. Chemically, tinned copper typically consists of high-purity copper with a thin, uniform layer of tin that forms intermetallic phases such as Cu₆Sn₅ and Cu₃Sn. These phases improve adhesion between copper and tin and contribute to the wire’s enhanced wear resistance and thermal stability (Choi et al., 2019).
The presence of tin on the surface prevents the rapid oxidation of copper and inhibits whisker formation—both of which can degrade conductivity in untreated copper wires. Additionally, the coating improves solderability and mechanical workability, allowing for easy crimping, coiling, and joining processes in electrical and electronic systems (Hara & 原利久, 2004).
Applications and Advantages
Electrical and electronic wiring. Tinned copper wire is extensively used in connectors, terminals, motor windings, and printed circuit boards (PCBs). Its excellent surface stability and low contact resistance make it ideal for high-current and high-frequency applications, particularly where long-term reliability is critical (Köhler et al., 2009).
Cabling and harness systems. The tin coating significantly enhances corrosion resistance, making CuSn wire suitable for marine, aerospace, and automotive environments where exposure to humidity, heat, or vibration can compromise standard copper conductors. Its high flexibility and fatigue strength also make it a preferred material for flexible cables and wiring harnesses (Dragomir et al., 2024).
Industrial and shielding applications. Tinned copper wire’s conductivity and mechanical stability make it ideal for use in electromagnetic interference (EMI) shielding, grounding systems, and braided cables. Its durability and resistance to surface oxidation ensure consistent shielding performance over time.
Performance Benefits
- High electrical and thermal conductivity with enhanced corrosion resistance.
- Excellent solderability and low contact resistance.
- Protection against oxidation and whisker formation.
- Superior mechanical flexibility and fatigue strength.
- Stable performance in humid, marine, and high-temperature environments.
Goodfellow Availability
Goodfellow supplies Tinned Copper (CuSn) Wire in a variety of diameters and tempers, suitable for research, manufacturing, and electronic applications. It is ideal for use in electrical interconnects, shielding, and precision wiring systems requiring long-term stability and corrosion resistance.
Explore Tinned Copper (CuSn) Wire and related conductive alloys in Goodfellow’s online catalogue: Goodfellow product finder.
References
- Koike, K., & 小池健志. (2009). Tinned Copper Alloy Bar with Excellent Abrasion Resistance, Insertion Properties, and Heat Resistance.
- Hara, T., & 原利久. (2004). Tinned Copper Alloy Material for Electrical/Electronic Components and Its Production Method.
- Köhler, M., Heide, A., Hojda, R., & Riepe, U. (2009). Copper–Tin Alloy, Composite Material and Use Thereof.
- Choi, J., Park, J., Kang, J., Frey, M. W., Oh, J.-W., & Kang, Y.-C. (2019). Investigation of Physicochemical Properties of CuSn-Based PAN Nanofibers Prepared via Electrospinning Method. Surface and Interface Analysis. https://doi.org/10.1002/SIA.6630
- Dragomir, F., Mănescu, T., & Tufiși, C. (2024). Influence of Copper–Iron (CuFe) and Copper–Tin (CuSn) Alloys over Mechanical Strength Properties in Crimping Process. Vibroengineering PROCEDIA. https://doi.org/10.21595/vp.2024.24508
- Tatsunori, N., & Masumitsu, S. (1992). Production of Tinned Copper Alloy Material Containing Zinc.