wedge bonding

**Wedge bonding** is the **wire bonding method that forms bonds using a wedge-shaped tool with primarily ultrasonic energy and mechanical force** - it is especially common with aluminum wire and fine-pitch applications. **What Is Wedge bonding?** - **Definition**: Tool-based bond formation where wire is pressed and ultrasonically scrubbed into metallization. - **Process Character**: Often lower-temperature than ball bonding and suitable for sensitive substrates. - **Geometry Benefit**: Directional bonding supports fine pitch and controlled wire routing. - **Typical Uses**: RF modules, power devices, and applications requiring aluminum interconnects. **Why Wedge bonding Matters** - **Fine-Pitch Capability**: Wedge geometry can handle tighter spacing in some package designs. - **Thermal Compatibility**: Lower bonding temperatures help protect temperature-sensitive structures. - **Material Alignment**: Well-suited to Al wire and certain pad metallization systems. - **Reliability**: Strong wedge bonds provide stable electrical and mechanical performance. - **Process Flexibility**: Directional tooling aids custom loop and routing constraints. **How It Is Used in Practice** - **Tool Setup**: Select wedge angle, capillary condition, and ultrasonic profile per device type. - **Path Programming**: Optimize bond path and loop trajectory for clearance and stress control. - **Bond Verification**: Use pull/shear testing and microscopy to validate bond integrity. Wedge bonding is **a precision wire-bond approach for specialized assembly needs** - wedge-bond optimization is critical for fine-pitch and thermally sensitive packages.