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Selective Soldering

Alloys for Selective Soldering

Specialized solutions for automated partial soldering processes

Selective soldering process with SAC305 alloys and SAC405 for precision applications. Ideal for electronics and automotive. Compliant with quality standards and process certifications.

Why Choose Our Alloys for Selective Soldering

Optimized performance for automated processes

Low Dross Formation
Specific formulations that minimize oxidation and dross in the crucible. Reduced maintenance and higher quality deposits.
Controlled Fluidity
Viscosity optimized for selective nozzles. Perfect filling of through-holes even with complex geometries.
Long Bath Life
Stable alloys that maintain characteristics over time. Reduced bath change frequency and operating costs.
Universal Compatibility
Suitable for all major selective machines (Ersa, Pillarhouse, SEHO, Nordson). Certifications for automotive and medical.
SAC alloys for selective soldering
Automated selective soldering process
THT components soldered selectively

Recommended Alloys for Selective

Technical characteristics for automated processes

AlloyCompositionMelting PointApplication
SAC 305Sn96.5/Ag3/Cu0.5217-220°CStandard for RoHS electronics
Sn-Cu (0.7%)Sn99.3/Cu0.7227°CEconomic lead-free alternative
SAC 387Sn95.5/Ag3.8/Cu0.7217-220°CReduced dross formation
Sn100CSn/Cu/Ni/Ge227°CExcellent 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

CharacteristicSelective SolderingWave SolderingReflow
ComponentsOnly selected THTAll THTOnly SMD
Mixed PCBIdeal (SMD+THT)Only THTOnly SMD
Thermal StressMinimal (local)High (whole PCB)Controlled
FlexibilityMaximumLowMedium
Process CostMedium-HighLowMedium

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

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