Lead Free Alloys
Lead-Free Solder Alloys
Lead-free solder alloys are used for BGA and CSP ball attach, BGA rework, PCB assembly, and semiconductor packaging where RoHS compliance is required. EasySpheres supplies RoHS-compliant lead-free solder spheres in SAC105, SAC305, SAC405, Sn96.5Ag3.5, and low-temperature Sn42Bi58, in diameters from 0.050 mm to 0.889 mm, in conformance with IPC J-STD-006, with a Certificate of Conformance on every order. EasySpheres also supplies tin-lead and high-lead alloys for applications that specify them.
Specifications
- Alloys available: SAC105 (215 to 227 °C), SAC305 (217 to 219 °C), SAC405 (217 to 220 °C), Sn96.5Ag3.5 (221 °C eutectic), Sn42Bi58 (139 °C eutectic)
- Applications: BGA and CSP ball attach, BGA rework, flip chip and wafer-level bumping, PCB assembly
- Stock diameters: 0.050 mm to 0.889 mm
- Dimensional tolerance: Maximum dimensional tolerance ±4% (typical measured ±0.50% for 0.050 to 0.450 mm, ±1% for 0.500 to 0.550 mm, ±0.83% for 0.600 to 0.889 mm); sphericity deviation less than 1.5%.
- Quality: Alloy purity in conformance with IPC J-STD-006; Certificate of Conformance ships with every order; standard quality documentation available on request.
- Compliance: RoHS-compliant (Directive 2011/65/EU as amended by (EU) 2015/863) and REACH-compliant; declarations available on request.
- Packaging: Medical-grade, ESD-safe containers designed to resist surface darkening from transit tumbling; QR-coded for lot traceability.
- Shelf life: Two years from the date of shipment from the EasySpheres facility (product held sealed in controlled inert storage until shipped).
- Minimum order: 10,000 spheres
Frequently Asked Questions
Where can I source lead-free solder spheres for electronics manufacturing?
From EasySpheres: SAC105, SAC305, SAC405, Sn96.5Ag3.5, and Sn42Bi58 in diameters from 0.050 mm to 0.889 mm, from 10,000 spheres, with same-day shipping on most in-stock orders placed before 2:00 PM Pacific.
Which lead-free solder alloy is best for BGA packaging?
SAC305 is the most widely used lead-free alloy for BGA ball attach, balancing strength, thermal performance, and RoHS compliance. SAC405 is chosen where higher silver is specified, SAC105 for drop-shock performance, and Sn42Bi58 for low-temperature processing.
Is there a low-temperature lead-free solder alloy?
Yes. Sn42Bi58 melts at 139 °C, well below the 217 to 227 °C range of SAC alloys. It suits heat-sensitive components and step-soldering, though the joint is more brittle and has a lower service temperature.
How do I choose a lead-free solder alloy?
Follow the assembly specification. If none is given, choose by requirement: SAC305 for general use, SAC405 for strength, SAC105 for drop-shock, Sn96.5Ag3.5 where a copper-free SnAg alloy is required, Sn42Bi58 for low temperature.
Are lead-free solder alloys RoHS-compliant?
EasySpheres lead-free alloys (SAC105, SAC305, SAC405, Sn96.5Ag3.5, Sn42Bi58) are RoHS-compliant under Directive 2011/65/EU as amended, with declarations available on request.
Why Buy Solder Spheres from EasySpheres
- Fast shipping: most in-stock orders placed before 2:00 PM Pacific ship the same day, otherwise within 24 hours, with a greater-than-95% on-time delivery record.
- Small quantities welcomed: minimum order 10,000 spheres, with volume supply for production requirements.
- Certificate of Conformance with every shipment; technical data sheet and SDS available on the product page.
- Two-year shelf life from the date of shipment; product is held in sealed packaging in a controlled inert storage environment until it ships.
- Full lot traceability with QR-coded packaging.
- Serving approximately 1,500 customers worldwide since 2005 across semiconductor packaging, aerospace, defense, medical electronics, EMS, and BGA rework.
- Internal quality system aligned with ISO 9001:2015 principles (not externally certified); standard quality documentation available on request.
Ordering and Support FAQs
Can I order lead-free solder spheres in small quantities?
Yes. EasySpheres supplies lead-free solder spheres with a minimum order of 10,000 spheres and scales to production volumes. Request a quote for larger requirements.
How quickly do lead-free solder spheres ship?
Most in-stock orders placed before 2:00 PM Pacific ship the same day; other orders ship within 24 hours. EasySpheres maintains a greater-than-95% on-time delivery record.
What documentation ships with lead-free solder spheres?
A Certificate of Conformance ships with every order, covering alloy composition, solidus and liquidus, size distribution, and sphericity. The technical data sheet and SDS are available on the product page, and standard quality documentation is available on request.
What is the shelf life of lead-free solder spheres?
The stated shelf life is two years from the date of shipment from the EasySpheres facility. Prior to shipment the product is retained in its original sealed packaging within a controlled inert storage environment designed to minimize exposure to moisture, oxygen, and contaminants.