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GAISER TOOL COMPANY

Gaiser Tool Company - Home Page

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GAISER SMALL WIRE WEDGE INFORMATION   

5. FRONT RADIUS

The FR provides the transition from the wire to the second bond. This transition, commonly referred to as the toe of the second bond, varies in size depending on the size of the FR. Most of the standard series of wedges designed for aluminum wire have FR's of 0.001in./25 or larger to minimize second bond toe cracks.

Gaiser designs the aluminum wire wedge FR to be the same size or larger than the wire diameter to be bonded. For gold wire applications, particularly when the wire diameters are 0.00l in./25 or smaller, the FR sizes can be smaller than the wire diameter. A 0.0004in./10 FR is available in the microwave wedge series

GTC Figure 42-11

Figure 11. This 2nd bond, or lead bond, was formed by a wedge having a FR of 0.001in./25m.

GTC Figure 42-12

Figure 12. This .001in./25m gold wire lead bond was formed with a wedge that has a .0004in./10m FR.

(Device: courtesy Spectrian; Photo: courtesy Integrated Reliability Services, Inc.) 

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