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West Bond 7476E Wedge-Wedge Wire Bonder

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The West Bond 7476E wire bonder is a two-way convertible wedge to wedge ultrasonic bonder designed to interconnect wire leads to semi-conductor, hybrid or microwave devices, located in McCullough Room 101. The machine can bond aluminum or gold wires ranging from 0.0007 in. to 0.002 in. as well as ribbons ranging from 0.001 in. to 0.010 in. Bonds are made by the wedge-wedge technique using ultrasonic energy to attach aluminum wire at room temperature and adding work piece heat for gold wire. Wire is clamped and threaded diagonally under the bonding wedge, allowing independent feeding action but requiring front-to-back bonding direction. The bonding tool is guided manually by the operator using hand/eye reference to bond targets and elevations. The wire bonder features programmable dual force (high or low), pure vertical Z, pneumatic braking of all axes during bonding, and radiant tool heat.

Standard bonding method of Model 7400E is 45° wire feed, clamps behind the tool, traditional wedge-wedge.

Protection against Electrostatic Discharge is implemented by finishing exposed tool assemblies and other moving parts by Electro less Nickel plating, which is conductive; and all exposed painted parts with a powder-coated paint that is dissipative.

More specifics can be found at

By default, the wire bonder is supplied with 0.001 in. diameter aluminum wire. Gold wire is available, and other wire diameters or bonding ribbons can be supplied by the user if desired. There are two West Bond sample holders that fit smaller samples, up to around 30 mm x 30 mm in size, one of which can be heated to improve gold wire bonding. There are a variety of aluminum blocks available as well to accommodate larger samples.

Getting Started and Training Information

In order to become a qualified user of the West Bond Wire Bonder, you need to follow each of these steps in the order as listed here:

  1. Complete the process to become a lab member of SNSF and follow the instructions to activate a Badger account.
  2. Complete the Wirebonder User Intake Form. An email is automatically sent to staff once you have completed the form.
  3. Staff will reach out to schedule a one-on-one in-person training session. 
    • Training is typically a single 2-hour session. Some users require more time to get a handle on bonding and rethreading, and may need a second follow-up session before qualification. 
    • It is strongly recommended that you read through the Standard Operating Procedures (see the Resources section below) prior to the training.
    • Building and room access to McCullough 101 will be granted after the training, if you don't already have access.