Description
The LASA Sn63/Pb37 Solder Paste 6337P is a premium-quality electronics-grade solder paste specifically designed for surface mount (SMD) soldering and PCB assembly applications. This solder paste uses a 63/37 tin-lead eutectic alloy, ensuring precise melting and excellent solder joint reliability.
Unlike traditional solder wire, the Sn63/Pb37 solder paste is optimized for reflow soldering processes, stencil printing, and syringe dispensing, making it ideal for professional electronics manufacturing as well as DIY electronics projects.
The eutectic 63/37 composition ensures a sharp melting point at 183°C, eliminating the plastic state and providing smooth transition from solid to liquid. This results in clean, strong, and highly reliable solder joints.
🔧 Key Features
- Sn63/Pb37 eutectic alloy composition
- Sharp melting point at 183°C
- Excellent wetting and solderability
- Low residue after soldering
- Non-corrosive and non-conductive flux
- Easy syringe dispensing
- Suitable for SMD and PCB applications
- Minimal cleaning required
- High reliability solder joints
- Low spattering and stable performance
⚙️ Why Choose Sn63/Pb37 Solder Paste
The Sn63/Pb37 solder paste is preferred in electronics because of its eutectic nature, meaning it transitions directly from solid to liquid without a semi-solid stage.
Advantages:
- No cold solder joints
- Faster soldering process
- Smooth and shiny joints
- Precise melting temperature
- Better control in SMD applications
- Reliable electrical and mechanical connections
This makes it ideal for precision electronics and fine-pitch soldering work.
📊 Technical Specifications (From Datasheet)
| Parameter | Specification |
|---|---|
| Product Name | LASA Sn63/Pb37 Solder Paste 6337P |
| Alloy Composition | 63% Tin (Sn) / 37% Lead (Pb) |
| Melting Point | 183°C |
| Flux Type | Rosin |
| Flux Classification | REL0 |
| Residue | Non-conductive, non-corrosive |
| Particle Size | 3 (25–45 µm typical) |
| Metal Loading | 85% – 87% |
| Shape of Particles | ≥95% spherical |
| Oxide Level | ≤80 ppm |
| Viscosity | Stable for dispensing |
| Shelf Life | ~6 months (refrigerated) |
🔥 Performance Characteristics
The LASA 6337P solder paste provides:
- Excellent wetting performance
- Low residue after reflow
- Clean PCB surface finish
- Minimal bridging issues
- Strong joint strength
- Consistent dispensing behavior
- High electrical conductivity
It is designed to produce reliable and durable solder joints even in complex PCB assemblies.
🔌 Applications
This solder paste is widely used in:
- SMD component soldering
- PCB reflow soldering
- Electronics manufacturing
- Arduino & IoT projects
- Mobile and laptop repair
- LED PCB assembly
- Robotics electronics
- Industrial electronics
- Prototype PCB development
- Fine pitch IC soldering
It is ideal for both manual dispensing and stencil-based soldering processes.
🧪 Usage & Application Guidelines
Dispensing
- Suitable for syringe dispensing
- Compatible with various needle sizes
- Maintain proper gap between nozzle and PCB
Pressure
- Recommended pressure: 15–25 psi
- Maintain constant pressure for uniform flow
Reflow Process
- Preheat gradually
- Soak temperature: 140–160°C
- Peak temperature: 205°C – 225°C
- Reflow time: 60–90 seconds
This ensures optimal solder joint formation.
❄️ Storage & Handling
- Store at 2°C – 10°C (refrigerated)
- Keep sealed to prevent contamination
- Bring to room temperature before use (3–6 hours)
- Avoid moisture exposure
- Shelf life: ~6 months
⚠️ Safety & Usage Tips
- Avoid direct skin contact
- Use in well-ventilated area
- Do not overheat
- Use proper reflow profile
- Clean nozzle after use
- Keep away from children
🧼 Cleaning
- Residues are non-corrosive and non-conductive
- Cleaning usually not required
- Can be cleaned using IPA or alcohol wipes
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