Specialty Chemicals, Adhesives & Plastics
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Wire bonding is a solid phase welding process where the bonding wire and the pad surface are brought into contact under a combination of heat, pressure and potentially ultrasonic energy. Caplinq offers its own product line of high quality Bonding wires for capillary (ball) and wedge bonding used in LED, Sensor and chip to chip die bonding applications.
We offer Copper, Aluminum, Silver, Gold, Palladium, Palladium & Copper and Gold - Palladium - Copper bonding wires that are suitable for wedge and ball/crescent interconnects. They can be used for thermosonic, ultrasonic or thermo-compression inter metal processes and can be easily handled and threaded to the bond head.
Our bonding wires come into various diameters ranging from 18 and to 25 microns and are packaged in 1000m rolls .
Interested in protecting your wire bonded chip? Take a look at our Encapsulant and Underfills product category that includes a wide range of glob top and dam and fill encapsulation materials.
Proper threading is crucial to make sure that the process goes smoothly. Reverse, Tail, Tear, Search speed, search delay and force settings need to be optimised to make a reliable and lasting bond. If the substrate is not plated then cleaning and dehydrating the substrate by exposing it to high temperatures is important to achieve good metal adhesion.
The correct settings will also ensure that we can achieve high speed, economical, strong bonds that will allow for the maximum loops per second that our equipment allows.
Thermocompression requires High pressure and an operating temperature ranging from 300-500°C. It is not compatible with ultrasonic energy, uses mostly Gold Wire and requires either a Gold or an Aluminium pad surface
Ultrasonic wire bonding requires low pressure and can operate in a temperature less than 80°C. It is compatible with ultrasonic energy, uses Aluminium bonding wires and can be applied in both Gold and Aluminium pads.
Thermosonic process is the midlle ground. It operates in low pressure and in a temperature ranging from 100-150°C. As the name applies it is also compatible with Ultrasonic energy, used mostly Gold bonding wires and can also operate on both Aluminium and Gold pad substrates.
A typical wirebonding process consists of the following steps:
Standoff stitch bonding(SSB) bonds first to the substrate’s bond finger and second to a gold stud(previously applied with a separate wire bonding operation) on the chip’s bond pad. SSB enables < 100 um loops without damaging bonding wires. Wire breakage happen with low modulus DA when the wire passes through the DA/MC interface.