By Shankara K. Prasad
"Advanced Wirebond Interconnection know-how addresses twine bonding from either production and reliability views. It analyzes and explores some of the components that one must ponder: layout, fabrics, processing, apparatus, caliber trying out and reliability engineering, and final yet no longer least, operator education. This publication is meant to be a finished resource of data and information that permits either a newcomer to the sphere and a veteran who wishes speedy info to decide on a method challenge. The ebook explains not just the right way to do issues akin to designating a bond pad or a lead finger, tips on how to opt for a correct bond twine, the way to layout a capillary and the way to optimize a bonding strategy at the manufacturing facility flooring, however the publication additionally explains why to do it that means. A CD-ROM is integrated, which incorporates second and 3D animations of many innovations which are mentioned during this e-book. The animations with voice-overs aid the reader clutch the information swifter with visible event, which results in greater retention.
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Additional info for Advanced Wirebond Interconnection Technology
High temperature thermosonic ball bonding operation is more reliable and less critical than the ultrasonic wedge bonding operation at room temperature. 7. This is less likely to happen in ball bonding as the lead-off is perpendicular to the device. 1 Disadvantages of Thermosonic Ball-Wedge Bonding The multi-directionality of gold ball bonding does mean, however, that the second (wedge) bond can be made with vibrations applied to the weld in any direction relative to the wire axis. The weldability of the wire to the lead finger is affected by the direction of vibrations.
Some of the other advantages of ultrasonic aluminum wedge bonding are: no special environments or shielding gases are necessary because it is a room temperature joining process relatively simple tooling requirements interface temperatures remain well below the melting point of the materials being joined under normal conditions. Contamination by thermal oxidation of the welding interface is therefore, not a problem metallurgically sound welds can be obtained between many dissimilar metals no major surface preparation is necessary before bonding intermetallic phases are seldom formed in the weld zone of dissimilar materials there are no electrical discharges to contaminate or damage the device fine wires can be joined to thin foils or to thick sections.
With force applied by the machinecontrolled capillary tip and ultrasonic energy transmitted through the capillary, the ball is squashed and the first bond is formed. Ball bonding on the bond pad occurs through a combination of plastic deformation and interfacial slip of the two materials due to force, temperature, and ultrasonic energy applied. (e) Raises to loop height: Now the looping of the wire begins. The capillary ascends to the top of the wire loop. During the ascent of the loop, the required calculated wire length is metered out precisely.
Advanced Wirebond Interconnection Technology by Shankara K. Prasad