Low SAC Type Y (SAC0307)
Low-Cost Lead-Free Solder Alloy
Product Overview
E-Qual LowSAC Type Y, also known as SAC0307, offers a cost-effective lead-free alternative to traditional tin/lead and high-silver SAC alloys. It perfectly balances performance and economy for modern assembly environments.
Versatile Application
Ideal for most wave-soldering applications, providing a reliable bond without the high cost of silver-heavy alloys.
Flux Ready
Fully compatible with low solids, no-clean, and VOC-free flux formulations for seamless integration.
Copper Management
Manage copper build-up effectively with LowSAC Type Ye copper-free top-up alloy. Our free solder bath analysis programme includes trend graphs to help you track contaminants effortlessly.
Technical Specifications
| Property | Value |
|---|---|
| Solidus | 217°C |
| Liquidus | 228°C |
| Density | 7.33 g/cm³ |
| Hardness (Hv) | 14.1 |
| Recommended Operating Temperature | 265°C ± 5°C |
Composition & Quality Control
Full Chemical Composition (%) +
| Element | Typical Range (%) |
|---|---|
| Tin (Sn) | Balance |
| Silver (Ag) | 0.30 ± 0.10 |
| Copper (Cu) | 0.60 – 0.80 |
| Lead (Pb) | 0.05 max |
| Antimony (Sb) | 0.05 max |
| Arsenic (As) | 0.01 max |
| Gold (Au) | 0.002 max |
| Bismuth (Bi) | 0.015 max |
| Cadmium (Cd) | 0.001 max |
| Iron (Fe) | 0.01 max |
| Nickel (Ni) | 0.008 max |
| Zinc (Zn) | 0.001 max |
| Aluminium (Al) | 0.0002 max |
| Indium (In) | 0.01 max |
*All values are maximums unless otherwise specified. Traceability records maintained for all batches.
Manufacturing & Quality Assurance +
Produced from fully traceable virgin metal batches. Our Quality Management System is approved to BS EN ISO 9001 and our Environmental Management System to BS EN14001. Batch samples are retained for a minimum of two years.
Operating Guidelines
Use in dynamic and turbulent wave solder systems at 265°C ± 5°C. Regular bath monitoring is essential for peak performance.
Standard Formats: Supplied as 1 kg Bars (300 x 32 x 12 mm) packed in 20 kg cartons, 4 kg Autofeed Ingots (500 x 45 x 33 mm) in 4.5 kg units, or Chunks (Chopped Bar) supplied in 20 kg tubs.
For all small-scale orders under 20kg, please visit our trusted partner, Surclean Material Technology who supplies our LowSAC in 1kg bars
Low SAC Type Y (SAC0307) FAQ
How does SAC0307 compare to SAC305 in terms of cost and performance? +
SAC0307 contains significantly less silver (0.3% vs 3.0%), making it a much more cost-effective alternative to SAC305. While it offers a slightly higher melting range, its wetting performance is comparable to SAC305 in most standard wave soldering applications.
What is the optimum operating temperature for a LowSAC bath? +
The recommended operating temperature is 265°C ± 5°C. Operating at this temperature ensures excellent through-hole penetration and fast wetting while maintaining the stability of the alloy’s fluidity during dynamic wave soldering.
How should I manage copper build-up in the solder pot? +
Lead-free alloys naturally dissolve copper from PCBs. To keep copper levels within the recommended 0.6%–0.8% range, use LowSAC Type Ye copper-free top-up alloy. Regular bath analysis is essential to determine when a partial drain or top-up is required.
Is LowSAC Type Y compatible with my current flux? +
Yes, this alloy is designed for high compatibility. It works effectively with low-solids, no-clean, and VOC-free flux formulations. Always refer to your flux manufacturer’s data sheet to ensure the pre-heat and contact times are optimized for a 228°C liquidus.
Why does SAC alloy joints look dull compared to tin/lead? +
This is a natural characteristic of lead-free SAC alloys. Due to the inherent grain structure and cooling rates, joints will appear more matte or “dull” than traditional SnPb joints. This does not indicate a sub-standard or weak connection; it is purely a visual difference.