Wire bonding

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Wire bonding
WireBonding.png
Technology Details
Other Names %other names and abbreviations, separated by commas%
Technology Technology
Equipment List of Wire bonding equipment
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Wire bonding can connect bond pads on devices to the leads of a package such as DIP or TO-5 cases. It can also be used to interconnect bond pads between two devices, the same device or to a printed circuit board.

Method of operation

Ultrasonic energy, when applied to metal to be bonded, renders it temporarily soft and plastic. This causes the metal to flow under pressure. The acoustic energy frees molecules and dislocates them from their pinned positions which allows the metal to flow under the low compressive forces of the bond.

The friction of the wire breaks up and sweeps aside some contaminants in the weld area exposing clean metallic surfaces which promote the metallurgical bonds. It is important, however, to begin with a clean surface to avoid difficulties or failures in bonding. In some cases the ultrasonic scrubbing may not be able to remove contaminants as in the case of lubricants. [1]

Parameters

The Force, Time, and Power controls are set for the best bond quality.

Force

The amount of additional pressure applied during the bond cycle.
Increasing force generally improves bondability, but too high a bond force may impair the efficiency of ultrasonic energy transfer (power).

Time

The duration of the bond cycle

Power

The amount of ultrasonic energy applied during the bond cycle

Workholder Temperature

Heat applied to the sample during bonding. This is most useful for Gold and Platinum. Typical temperatures range from 100 to 150 degrees C.

Wedge heater Temperature

Heat is applied to the wedge when the workholder is heated. When used, the wedge heater is normally set to 36.

Subtechnology 1

Main article: Subtechnology 1

Describe any sub-technologies of this technology.

Applications

Wire bonding is intended to create electrical interconnections in semiconductor chip packaging.

Materials

Wire bonding is best done with Gold and Aluminum pads. Other materials can be use also.

Equipment

The LNF has one wire bonder.

Equipment 1

Main article: Wire Bonder

The K&S 4123 Wire Bonder is a wedge bonder that is designed to connect bond pads on devices to the leads of a package such as DIP or TO-5 cases. It can also be used to interconnect bond pads between two devices, the same device or to a printed circuit board.

Complete tool list

Main article: Wire Bonder

See also

Other related wiki pages

References

  1. HYBOND, Inc. - About Wire Bonding[http://www.hybond.com/pages/wirebond-about.php

Further reading

  • Other stuff, e.g. technology workshop slides
  • External links (can be in another section below, if appropriate)

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