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Cost Reduction Using Vertical Tie-Bar Clips

IP.com Disclosure Number: IPCOM000010211D
Publication Date: 2002-Nov-06
Document File: 6 page(s) / 67K

Publishing Venue

The IP.com Prior Art Database

Abstract

Improvement in the electrical resistance of semiconductor packages can be improved by using a clip in place of wire bonds (see Figure 1) Key Words: Tie-bar, clips, lead-frame Reducing the cost of processing clips may be achieved through two methods. One method is by increasing the number of clips per unit length of frame. And a second method is reducing the clearance between the tie-bar edge and the side of the package, thereby providing more clearance and permitting a smaller package size. The cost of the clip fabrication can be broken into material cost and stamping cost. The material itself contributes the majority of the clip cost. This means a denser clip distribution within a fixed length will provide a less expensive clip unit cost. By increasing the number of clips per frame length, the design of a vertical tie bar clip frame will reduce the cost substantially.

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Cost Reduction Using Vertical Tie-Bar Clips

Improvement in the electrical resistance of semiconductor packages can be improved by using a clip in place of wire bonds (see Figure 1)

Key Words: Tie-bar, clips, lead-frame

                                � � � � � � � � � � � � � � � � � � Figure 1

Reducing the cost of processing clips may be achieved through two methods.� One method is by increasing the number of clips per unit length of frame.� And a second method is reducing the clearance between the tie-bar edge and the side of the package, thereby providing more clearance and permitting a smaller package size.

The cost of the clip fabrication can be broken into material cost and stamping cost.� The material itself contributes the majority of the clip cost.� This means a denser clip distribution within a fixed length will provide a less expensive clip unit cost.� By increasing the number of clips per frame length, the design of a vertical tie bar clip frame will reduce the cost substantially.

Clips are attached in frame form and packed on a reel.� The reel feeding direction with reference to the clip orientation is 90 degrees.� The reel feeding direction may be either parallel or perpendicular for a pick and place machine that use either Linear or Rotation pick-up head (Figure 2).

FIGURE 2

Figure 3 illustrates the protruding horizontal tie bar after cutting, thereby reducing the gap or clearance between the tie-bar edge and the side of the package.

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FIGURE 3

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