Physical PropertiesAuSn PASTE
Automatic control over bonding direction in mounted devices by self-alignment
Water-soluble AuSn Paste: Able to clean the flux residue using only water after reflow
Gold-tin alloy is Au-20wt%Sn with a eutectic of 280C (melting point) and Au-90wt%Sn with a eutectic of 217C (melting point).
Physical Properties
Particularly Au-20wt%Sn has excellent electricity and thermal conductivity.
Au-20wt%Sn alloy and Au-22wt%Sn alloy are considered to have no big difference between in the physical properties mentioned above.
| Composition (wt%) |
Melting Temperature |
Mechanical Properties | Physical Properties | Specific gravity |
|||||
|---|---|---|---|---|---|---|---|---|---|
| Solidus Curve (℃) |
Liquidus Curve (℃) |
Tensile Strength (kg/mm2) |
Extension (％) |
Hrdness (Hg) |
Thermal expansivity (×10-6/℃) |
Thermal conductivity (W/m·K) |
Electric conductivity (IACS%) |
||
| Au | 1,063 | 1,063 | 13.3 | 45 | 25 | 14.2 | 311 | 75 | 19.3 |
| Au-20Sn | 280 | 280 | 29.0 | - | 118 | 17.5 | 57.3 | 8.0 | 14.52 |
| Au-90Sn | 217 | 217 | 6.4 | 2 | 16 | 13.6 | - | 11.2 | 7.78 |
| Au-12Ge | 356 | 356 | 19.0 | - | 108 | 12.0 | 44.4 | - | 14.67 |
| Au-7.4Ge | 356 | 680 | - | - | 82 | 13.1 | - | 7.1 | 16.16 |
| Au-3.15Si | 363 | 363 | 26.0 | - | 86 | 14.9 | - | - | 15.7 |
| Au-2Si | 363 | 760 | - | - | 65 | 13.9 | - | 15.8 | 16.85 |
| Pb-63Sn | 183 | 183 | 4.9 | - | 17 | 24.7 | 49 | 11.9 | 8.42 |
| Pb-5Sn | 310 | 315 | 9.5 | 26 | 8 | 28.7 | 23 | 8.8 | 11.0 |
| Sn-3.5Ag | 221 | 221 | 2.0 | 73 | 40 | - | 33 | 14.0 | 7.36 |
Au-Sn Phase Diagram
