Wire Bonding Machine

Workflow of Wire Bonding Machine

Loading: The machine starts by loading the substrate or package containing the IC or electronic component onto the work stage. The substrate is typically a ceramic or silicon wafer.

Wire feeding: The wire bonding machine feeds a spool of wire into the system. The wire is typically very thin, ranging from around 15 to 75 micrometers in diameter. The wire is threaded through a series of guides and clamps to ensure proper alignment and tension.

Positioning: The machine positions the bonding tool, which holds the wire, in the correct location over the substrate. The bonding tool consists of a small, wedge-shaped tool or capillary that is capable of holding and manipulating the wire.

Bonding process: The machine controls the position, force, and energy applied during the bonding process. It uses a combination of heat, ultrasonic energy, and pressure to create reliable and durable wire bonds. The parameters can be adjusted based on the wire material, bonding method, and specific requirements of the IC assembly.

First bond: The machine moves the bonding tool to the desired location on the substrate, and the molten ball at the end of the wire is pressed onto a bonding pad or terminal. The combination of heat and pressure creates a solid metallurgical bond between the wire and the pad.

Loop formation: After the first bond is created, the bonding tool moves to create a loop in the wire. The loop is formed to allow for stress relief and accommodate any thermal expansion or contraction that may occur during the operation of the electronic device.

Second bond: The bonding tool moves to another location on the substrate, typically a lead or another bonding pad, and the wire is pressed onto it. Another bond is created using heat and pressure, forming a connection between the wire and the new location.

Wire cutting: Once the second bond is made, the excess wire extending from the second bond is cut using a cutting tool or laser. This ensures that the wire is trimmed to the desired length, leaving a clean and precise connection.

Inspection and quality control: After the wire bonding process is completed, the machine may include an inspection system to check the quality of the bonds. This can involve visual inspection, electrical testing, or other methods to ensure that the bonds meet the required standards.

Repeat: The machine repeats the process for each bond required to complete the circuit or connect the electronic component to its package. The number of bonds and their locations depend on the specific design and requirements of the device.

Applications of Wire Bonding

Consumer Electronics

Wire bonding in consumer electronics includes connecting the semiconductor dies to their packages in gadgets like Smartphone and Portable tablets, laptops, and other portable gadgets. Hence, this technique is suitable for use in larger production in the consumer electronics subsector due to its cost and efficiency.

Automotive Electronics

Wire bonding in automotive is used in MCUs, sensors, power modules, and many more significant parts of automobile. Therefore, applications of wire bonding electronics in automobiles are significant because of their complementary characteristics like high tolerance to environmental conditions for example temperature, humidity, etc

Aerospace and Defense

Military and aviation-related products require very reliable electronic parts that can survive even the harshest conditions. Wire bonding is widely applied in radar apparatus, communication equipment, and missile control systems.

Medical Devices

Medical-related applications include pacemakers, hearing aids, electronically controlled body implants, and diagnostic equipment where wire bonding is vital for the development of good electrical connections. Due to these parameters of wire bonding, their reliability and accuracy are very high, they are ideal for use in life-sensitive circuits where the failure rate is virtually nonexistent.