Method for attaching a semiconductor die to a leadframe, and a semiconductor device
First Claim
1. A method for attaching a semiconductor die to a leadframe, the method comprising:
- providing the leadframe with a carrier pad attached thereto, the carrier pad being electrically non-conductive and having first and second major surfaces, and an at least a partially cured first adhesive bonding the leadframe to the first major surface of the carrier pad,applying, after providing the leadframe with the carrier pad attached thereto, a flowable temperature curable second adhesive to the second major surface of the carrier pad, in which the second adhesive is liquid at room temperature,placing the die on the second adhesive on the second major surface of the carrier pad for facilitating wire bonding of the die to the leadframe, andsubjecting the second adhesive to a curing temperature for curing thereof to bond the die to the carrier pad.
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Accused Products
Abstract
Methods are disclosed related to attaching a die to a leadframe. One such method includes initially bonding a carrier pad which is pre-coated with a thermosetting first adhesive to the leadframe. The first adhesive can be raised to its thermosetting cure temperature by heating the leadframe to a temperature just above the thermosetting cure temperature of the first adhesive. A thermosetting second adhesive which is liquid at room temperature can be applied to a second major surface of the carrier pad, and the die can be placed on the second adhesive and aligned with the leadframe. The second adhesive can be raised to its thermosetting cure temperature to bond the die to the carrier pad, and in turn form a bonded assembly.
29 Citations
27 Claims
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1. A method for attaching a semiconductor die to a leadframe, the method comprising:
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providing the leadframe with a carrier pad attached thereto, the carrier pad being electrically non-conductive and having first and second major surfaces, and an at least a partially cured first adhesive bonding the leadframe to the first major surface of the carrier pad, applying, after providing the leadframe with the carrier pad attached thereto, a flowable temperature curable second adhesive to the second major surface of the carrier pad, in which the second adhesive is liquid at room temperature, placing the die on the second adhesive on the second major surface of the carrier pad for facilitating wire bonding of the die to the leadframe, and subjecting the second adhesive to a curing temperature for curing thereof to bond the die to the carrier pad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for attaching a semiconductor die to a leadframe, the method comprising:
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providing the leadframe with a flexible carrier pad attached thereto, the flexible carrier pad being electrically non-conductive and having first and second major surfaces, the first major surface being bonded to the leadframe via a first adhesive, wherein the flexible carrier pad overlays proximal portions of proximal ends of leads of the leadframe, applying, after providing the leadframe with the flexible carrier pad attached thereto, a flowable second adhesive to the second major surface of the flexible carrier pad, wherein the second adhesive is liquid at room temperature, positioning the die over the second adhesive on the second major surface of the flexible carrier pad, and curing the second adhesive so as to secure the die to the flexible carrier pad.
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Specification