Cu-Zr alloy
ZC
C15150
Highly heat resistant copper alloy for lead frame with high conductivity of oxygen-free copper class
Positioning map
It is used for power semiconductors such as lead frames and heat sinks with copper alloys with the same conductivity as that of copper and excellent strength and heat resistance.
Main features
- Very good electric and thermal conductivity (conductivity%, IACS average)
- Excellent strength as compared with pure copper
- Excellent heat resistance
- Nonmagnetic
- Possible to process reflow-Sn plating with excellent surface quality and whisker resistance
Chemical composition
The chemical components of ZC are as follows.
(Weight %)
| Zr | Cu |
|---|---|
| 0.02 | Rem. |
Technical Data
Physical properties
The physical properties of ZC are as follows.
| Property | Representative Value |
|---|---|
| Specific Gravity (293K) | 8.9 |
| Coefficient of Thermal Expansion (×10-6/K：293～573K) |
17.7 |
| Thermal Conductivity (W/(m・K)：293K) |
373 |
| Volume Resistivity (μΩm：293K) |
0.018 |
| Electrical Conductivity (%IACS:293K) |
97 |
| Modulus of Elasticity (kN/mm²: 293K) |
121 |
Mechanical properties (Sampling direction:L.D.)
Mechanical properties of ZC are as follows.
ZC has strength exceeding that of pure copper as
required characteristic for lead frame application.
| Temper | ||||
|---|---|---|---|---|
| 1/2H | H | EH | SH | |
| Tensile Strength (N/mm²) |
245～295 | 295～355 | 355～410 | 410～470 |
| Elongation (%) |
6 | 4 | 2 | 2 |
| Vickers Hardness※ (HV) |
(75～110) | (100～120) | (110～130) | (125≦) |
Heat resistance
It corresponds to energization heat generation for high current semiconductor
device applications and shows the heat resistance higher than pure copper.
