Sn42Bi58 T3 solder powder

The Sn42Bi58 T3 solder powder is a lead-free tin-bismuth alloy with a defined melting point of only approx. 138 °C. Due to the high Bismuth content (58 %) the powder is ideal for soldering temperature-sensitive components where conventional Sn-Ag solders would cause excessive thermal stress. The T3 grit (25-45 µm) ensures uniform processing in solder pastes and stable performance in the reflow process.

Properties and advantages

• Low melting point (~138 °C): Protects sensitive components and reduces thermal loads.
• Lead-free & RoHS compliant: Fulfils legal requirements and is suitable for sustainable electronics production.
• T3 grit: Clean stencil printing results, stable paste rheology and reliable reflow solder joints.
• High wettability: Uniform and homogeneous solder joints for SMT layouts.
• Cost-efficient: Bismuth alloys are an attractive alternative to expensive silver solders.

Areas of application

Temperature-sensitive electronics

Particularly suitable for Semiconductor Technology & Electronicswhere components - such as sensors, LEDs or finely structured circuit boards - must not be heated too much.

SMT and reflow processes

The T3 grit allows precise paste deposition during stencil printing and ensures stable solder joints in standard SMT and reflow applications.

Hard & soft soldering

Also in the Hard & soft soldering Sn42Bi58 is used when defined melting points and process-reliable flow properties are required.

Automotive industry & electrical engineering

In the Automotive industry and the Electrical engineering it is suitable for assemblies that are temperature- or material-sensitive but still require reliable solder joints.

Technical properties

• Composition: Sn 42 %, Bi 58 %
• Melting point: approx. 138 °C
• Grain size: T3 (typically 25-45 µm)
• Particle morphology: Spherical for even distribution
• Purity: Controlled quality, low oxidation tendency

Sustainability & regulation

As Lead-free solder Sn42Bi58 fulfils the RoHS requirements and contributes to more environmentally friendly production processes. In addition, the low energy requirement in the reflow process reduces the ecological footprint.

Conclusion

Sn42Bi58 T3 solder powder is the perfect solution for soldering temperature-sensitive components. With a low melting point, lead-free composition and precise T3 grain size, it combines process reliability with sustainability. Further possible applications can be found in the following areas Semiconductor Technology & Electronics and Hard & soft soldering.