Solder & Low-Melting Alloy SAC305 REFLOWED
Heat-treated state
ISO 711 · also IEC A30C5
Reference condition for joint-level design data straight off the reflow oven, before thermal ageing.
Values for the REFLOWED condition
Other SAC305 tempers and conditions
SAC305 is listed in 2 conditions; see the grade overview at SAC305.
- AGED-150
- REFLOWED
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Isothermally aged | Use for end-of-life / high-temperature reliability estimates, where IMC coarsening drops strength and stiffness. | 22 | 33 | 42 | 12 HB | 13.5 % IACS |
REFLOWEDThis page rapid cooling, fine Ag3Sn/Cu6Sn5 dispersion | Reference condition for joint-level design data straight off the reflow oven, before thermal ageing. | 40 | 55 | 25 | 17 HB | 13 % IACS |
What is SAC305 REFLOWED?
SAC305 REFLOWED is SAC305 heat treated to REFLOWED — reference condition for joint-level design data straight off the reflow oven, before thermal ageing. SAC305 REFLOWED has a yield strength of 40 MPa (5.8 ksi) and a tensile strength of 55 MPa (7.98 ksi) — stronger than 88% of solder & low-melting alloy grades. Elongation at break is 25% and the elastic modulus is 48 GPa (6.96 Msi). SAC305 REFLOWED has a density of 7.38 g/cm³ (0.267 lb/in³), lighter than 74% of solder & low-melting alloy grades. It melts at 217°C (423 °F).
Advantages
- High strength — 40 MPa (5.8 ksi), better than 88% of solder & low-melting alloy grades
- High electrical conductivity — 13 % IACS, better than 87% of solder & low-melting alloy grades
- Conducts heat well — 58 W/m·K (33.5 BTU/hr·ft·°F), better than 85% of solder & low-melting alloy grades
- Readily welded — 30/100, better than 83% of solder & low-melting alloy grades
- Stiff — 48 GPa (6.96 Msi), better than 81% of solder & low-melting alloy grades
Limitations
- Difficult to machine — 20/100, worse than 94% of solder & low-melting alloy grades
- High embodied carbon — 24 kg CO₂/kg, worse than 94% of solder & low-melting alloy grades
- Limited ductility — 25%, worse than 76% of solder & low-melting alloy grades
SAC305 REFLOWED properties
Typical room-temperature values for SAC305 REFLOWED; 17 are specific to this condition. Other listed values are SAC305 reference data and may not represent this condition. Bars are the position among solder & low-melting alloy grades.
Physical3
SAC305 REFLOWED has a density of 7.38 g/cm³ (0.267 lb/in³), lighter than 74% of solder & low-melting alloy grades. It melts at 217°C (423 °F).
Mechanical11
SAC305 REFLOWED has a yield strength of 40 MPa (5.8 ksi) and a tensile strength of 55 MPa (7.98 ksi) — stronger than 88% of solder & low-melting alloy grades. Elongation at break is 25% and the elastic modulus is 48 GPa (6.96 Msi).
Thermal6
SAC305 REFLOWED is rated for continuous service to 125°C (257 °F). It conducts heat at 58 W/m·K (33.5 BTU/hr·ft·°F), better than 85% of solder & low-melting alloy grades. Thermal expansion is 22 µm/m·K (12.2 µin/in·°F).
Electrical3
SAC305 REFLOWED conducts electricity at 13 % IACS, better than 87% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 52% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of SAC305 REFLOWED takes about 350 MJ of energy and emits 24 kg of CO₂ — more than 92% of solder & low-melting alloy grades. Typical recycled content is 25%.
Manufacturability6
SAC305 REFLOWED's machinability is poor (20/100, worse than 94% of solder & low-melting alloy grades); weldability poor (30/100); formability excellent (85/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SAC305 REFLOWED
Is SAC305 easy to machine?
Rarely machined — extremely soft and gummy; use sharp positive-rake tools, high rake, kerosene-type lubricant, or simply stamp/shear preforms instead.
Can SAC305 be welded?
Not a welding alloy; joints are made by melting the solder itself — reflow peak 235–250 °C, wave pot 255–265 °C, with N2 helpful for wetting and dross control.
Can SAC305 be formed, bent or molded?
Casts to bar/ingot readily and draws to sub-0.3 mm wire or rolls to thin foil without intermediate anneal; atomized under inert gas for paste powder and BGA spheres.
What surface finishes work on SAC305?
No coating normally applied; keep flux residues per IPC J-STD-001 cleanliness limits, and consider conformal coating or Ni/Bi-modified variants to suppress tin whiskers and dendritic migration.
SAC305 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| AgJ-STD-006 Sn96.5Ag3.0Cu0.5 (SAC305) | 2.9 – 3.2 | 3 |
| Cu | 0.4 – 0.6 | 0.5 |
| PbRoHS-compliant limit; many suppliers hold ≤0.05 | ≤ 0.07 | — |
| Sbimpurity limit | ≤ 0.05 | — |
| Biimpurity limit | ≤ 0.05 | — |
| Feimpurity limit | ≤ 0.02 | — |
| Asimpurity limit | ≤ 0.03 | — |
| Cdimpurity limit | ≤ 0 | — |
| Znimpurity limit | ≤ 0 | — |
| Alimpurity limit | ≤ 0 | — |
| Niimpurity limit (intentional Ni additions give SAC305+Ni variants) | ≤ 0.01 | — |
| Snbalance, nominally 96.5 % | balance | — |
SAC305 REFLOWED — frequently asked
What is SAC305 REFLOWED used for?
SAC305 REFLOWED is typically used for reflow SMT soldering, wave soldering, solder paste/preforms and roHS-compliant electronics manufacturing. In short: industry-standard lead-free solder; widest form availability; roHS default alloy.
What is the yield strength of SAC305 REFLOWED?
SAC305 REFLOWED has a typical yield strength of 40 MPa (5.8 ksi) and a tensile strength of 55 MPa (7.98 ksi) — stronger than 88% of solder & low-melting alloy grades. Strength varies by condition: see the 2 listed tempers.
Is SAC305 REFLOWED easy to machine?
Not especially — machinability is rated poor (20/100, worse than 94% of solder & low-melting alloy grades). Rarely machined — extremely soft and gummy; use sharp positive-rake tools, high rake, kerosene-type lubricant, or simply stamp/shear preforms instead.
Can SAC305 REFLOWED be welded?
Not readily — weldability is rated poor (30/100). Not a welding alloy; joints are made by melting the solder itself — reflow peak 235–250 °C, wave pot 255–265 °C, with N2 helpful for wetting and dross control.
What surface finishes work on SAC305 REFLOWED?
No coating normally applied; keep flux residues per IPC J-STD-001 cleanliness limits, and consider conformal coating or Ni/Bi-modified variants to suppress tin whiskers and dendritic migration.
Can SAC305 REFLOWED be formed, bent or molded?
Casts to bar/ingot readily and draws to sub-0.3 mm wire or rolls to thin foil without intermediate anneal; atomized under inert gas for paste powder and BGA spheres.
What is the maximum service temperature of SAC305 REFLOWED?
SAC305 REFLOWED is rated for continuous use to about 125°C (257 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- IPC J-STD-006 — Requirements for Electronic Grade Solder Alloys — IPC (2013)
- IPC J-STD-005 / J-STD-004 — Solder paste and flux requirements — IPC (2012)
- IEC 61190-1-3 — Solder alloys (A30C5 designation) — IEC (2017)
- GB/T 20422 — SAC (China) (2018)
- SAC305 alloy and solder paste technical datasheets — Indium Corporation / AIM Solder / Kester / Alpha Assembly (2023)
- Properties of Lead-Free Solders / Pb-free solder property database — NIST (2002)
- Lead-Free Soldering — mechanical and reliability data compilations — Springer / IPC-9701 reliability literature (2011)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.