Alloys for Selective Soldering
Specialized solutions for automated partial soldering processes
We supply specific alloys and materials for selective soldering machines. Our solutions guarantee optimal fluidity, low dross formation, long bath life and quality deposits for THT components on PCBs with already mounted SMD components.
Why Choose Our Alloys for Selective Soldering
Optimized performance for automated processes
Recommended Alloys for Selective
Technical characteristics for automated processes
| Alloy | Composition | Melting Point | Application |
|---|---|---|---|
| SAC 305 | Sn96.5/Ag3/Cu0.5 | 217-220°C | Standard for RoHS electronics |
| Sn-Cu (0.7%) | Sn99.3/Cu0.7 | 227°C | Economic lead-free alternative |
| SAC 387 | Sn95.5/Ag3.8/Cu0.7 | 217-220°C | Reduced dross formation |
| Sn100C | Sn/Cu/Ni/Ge | 227°C | Excellent fluidity, no Ag |
Selective Soldering Applications
Sectors using the selective process
Automotive Electronics
ECU, sensors, heavy connectors. THT soldering on PCBs with already mounted SMD components. Mixed SMD+THT process.
Industrial
Industrial controls, inverters, power supplies. THT power components on boards with SMD logic.
Medical
Diagnostic devices, instrumentation. Special THT components not suitable for reflow, medical certifications.
Telecommunications
Routers, switches, telecom equipment. Connectors, transformers and large THT components on complex PCBs.
Selective vs Wave vs Reflow: Comparison
When to choose selective soldering
| Characteristic | Selective Soldering | Wave Soldering | Reflow |
|---|---|---|---|
| Components | Only selected THT | All THT | Only SMD |
| Mixed PCB | Ideal (SMD+THT) | Only THT | Only SMD |
| Thermal Stress | Minimal (local) | High (whole PCB) | Controlled |
| Flexibility | Maximum | Low | Medium |
| Process Cost | Medium-High | Low | Medium |
Recommendation: Selective soldering ideal for mixed PCBs with SMD (reflow) + some THT components (connectors, transformers). Alternative to wave when thermal stress on SMD components is problematic.
Frequently Asked Questions about Selective Soldering
Everything you need to know about the selective process
Request Consultation for Selective Soldering
Our experts help you optimize the selective process with the most suitable alloys
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+39 02 6604 7053