SAC305 Solid Solder Wire: Professional Lead-Free Solution for Industrial Electronics Assembly
SAC305 Solid Solder Wire is an industry-standard lead-free alloy precision-formulated with 96.5% tin (Sn), 3.0% silver (Ag), and 0.5% copper (Cu). Engineered for uncompromising precision and repeatability, it delivers reliable joint stability without the use of hazardous lead.
Manufactured via advanced continuous casting and rigorous dimensional drawing, our solid wire features a bright, oxide-free metallic surface and uniform alloy distribution from spool to spool. It is purpose-built for automated, semi-automated, and manual soldering environments requiring strict adherence to international environmental regulations.
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Sn96.5 / Ag3.0 / Cu0.5 (±0.1% tolerance) |
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Lead-Free (Pb-Free, <0.1%) |
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217℃ - 220℃ (422.6℃F - 428℃F) |
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0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm (Custom sizes available) |
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Smooth, oxide-free, bright metallic extrusion |
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1. Controlled Alloy Chemistry & Batch Consistency
Exact weight ratios of Sn, Ag, and Cu are verified via automated XRF testing for every single production run.
Eliminates unpredictable melting behaviors and cold solder defects caused by unstable secondary raw material sourcing, significantly lowering production line scrap rates.
2. Optimized Wetting Performance
The optimized 0.5% copper addition minimizes copper dissolution from PCB pads and component leads, protecting delicate, fine-pitch circuit traces during contact.
Prevents incomplete wetting on oxide-prone copper or nickel-gold finishes, reducing costly manual post-solder touch-ups.
3. Structural Integrity Under Thermal and Mechanical Stress
A 3.0% silver content increases shear strength and creep resistance compared to binary Sn-Cu alternatives, providing robust thermal fatigue resistance.
Guarantees long-term joint survival in high-vibration equipment and environments subjected to rapid daily temperature fluctuations.
4. Precision Dimensional Tolerance
Drawn with strict outer-diameter tolerances to ensure smooth, jamming-free feeding in automated wire feeders and hand-held soldering setups.
Prevents erratic solder wire feeding and minimizes flux-less wire feeding slips during automated robotic soldering processes.
Through-hole and surface-mount secondary touch-up work demanding stable electrical conductivity.
Sensors, electronic control units (ECUs), and dashboard assemblies exposed to severe mechanical shock and continuous thermal cycling.
High-power LED modules and heat-sink-mounted substrates requiring superior thermal dissipation stability.
Power supplies, control panels, and outdoor communication relays subject to strict regulatory lifespans.
Every batch of SAC305 solid wire undergoes multi-stage verification before export, backed by certified global manufacturing standards (ISO9001 / ISO14001):
Sourcing exclusively 99.99% high-purity virgin metals to prevent micro-contamination by bismuth, antimony, or iron.
Comprehensive XRF and ICP-OES elemental verification, with third-party SGS testing reports available upon request.
Continuous laser-micrometer outer diameter tracking and melting range verification via differential scanning calorimetry.
Supplied in secure, moisture-resistant packaging engineered for safe global shipping and streamlined inventory management:
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50g, 100g, 250g, 500g, and 1kg industrial spools. |
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OEM private-label spool branding, custom net weights, and tailored carton configurations to support regional distributors. |
Q: What is SAC305 solder wire?
A: A: SAC305 solder wire is a lead-free solder alloy containing 96.5% tin, 3.0% silver, and 0.5% copper. It stands as a premier global standard for lead-free electronic assembly.
Q: Is SAC305 solder wire RoHS compliant?
A: Yes. SAC305 is fully compliant with RoHS and WEEE directives, making it ideal for eco-conscious global electronics manufacturing.
Q: What is the melting temperature of SAC305 solder wire?
A: A: The melting range of SAC305 is approximately 217℃ - 220℃ (422.6℃F - 428℃F).
A: Standard production diameters include 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, and 1.2 mm. Custom sizes can be manufactured upon request.
Q: What industries use SAC305 solder wire?
A: It is widely utilized across electronics manufacturing, advanced PCB assembly, automotive ECU production, LED manufacturing, and telecommunications infrastructure.
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