Solder Materials (Tin-Silver Alloys)
Lead-free solder alloys based on tin-silver-copper (SAC) chemistry used for permanent electrical and mechanical interconnection of components on automotive PCBs.
Overview
Automotive solder materials are primarily SAC (tin-silver-copper) alloys, replacing traditional tin-lead (Sn63Pb37) solders following the implementation of the RoHS Directive. SAC305 (96.5% Sn, 3% Ag, 0.5% Cu) is the most widely used automotive-grade lead-free solder, offering a melting point of ~217–220°C and good mechanical and thermal cycling reliability. Solder is used in reflow, wave, and selective soldering processes to mount and interconnect electronic components on automotive PCBs across powertrain ECUs, ADAS systems, body control modules, and battery management systems. High-reliability automotive grades must withstand thermal cycling from –40°C to +150°C over the vehicle's life.
Automotive Applications
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Properties
Category
Type
Electronic Assembly Material
Available Colors
Available Forms
Key Properties
- Lead-free (RoHS compliant)
- Good thermal cycling reliability
- Low melting point
- Strong mechanical bond
- Excellent electrical conductivity
- Compatible with standard reflow processes
Technical Specifications
Density
7.4–7.5 g/cm³
Temperature Resistance
Melting point 217–221°C (SAC305)
Sustainability
Sustainability Rating
Lead-free SAC solders comply with RoHS and ELV Directive. Tin and silver from solder are recoverable in PCB recycling streams.