Semiconductor devices including voltage switchable materials for over-voltage protection
First Claim
Patent Images
1. A semiconductor device comprising:
- a dielectric substrate including, on a surface thereof, a conductor;
a semiconductor die attached to the surface; and
an underfill layer including a first voltage switchable material connecting the semiconductor die to the conductor, the first voltage switchable material physically contacting both the semiconductor die and the conductor,wherein the conductor is situated between a die attach adhesive and a die bonding pad.
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Abstract
Semiconductor devices are provided that employ voltage switchable materials for over-voltage protection. In various implementations, the voltage switchable materials are substituted for conventional die attach adhesives, underfill layers, and encapsulants. While the voltage switchable material normally functions as a dielectric material, during an over-voltage event the voltage switchable material becomes electrically conductive and can conduct electricity to ground. Accordingly, the voltage switchable material is in contact with a path to ground such as a grounded trace on a substrate, or a grounded solder ball in a flip-chip package.
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Citations
7 Claims
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1. A semiconductor device comprising:
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a dielectric substrate including, on a surface thereof, a conductor; a semiconductor die attached to the surface; and an underfill layer including a first voltage switchable material connecting the semiconductor die to the conductor, the first voltage switchable material physically contacting both the semiconductor die and the conductor, wherein the conductor is situated between a die attach adhesive and a die bonding pad. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification