Shielding technique for semiconductor package including metal lid
First Claim
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1. A semiconductor package comprising:
- a leadframe including a die pad having at least one tie bar connected thereto and extending therefrom and a plurality of leads extending at least partially about the die pad in spaced relation thereto, each lead having a lead top surface and a lead bottom surface;
a semiconductor die having a first surface and a second surface opposed to the first surface, the second surface attached to the die pad and electrically connected to at least some of the leads;
a package body covering at least portions of the die pad, the tie bar and the leads where at least some leads each have both the lead top surface at least partially exposed in a top surface of the package body and the lead bottom surface at least partially exposed in a bottom surface of the package body, the package body including at least one via which is formed therein and terminates on the tie bar, the via being laterally surrounded by the package body, wherein;
the top surface of the package body includes at least first and second sections, the first section being recessed relative to the second section;
the via is formed in the second section of the top surface;
the package body is formed such that the die pad, the tie bar and at least some of the leads each include a portion that is exposed in the first section of the top surface; and
the top surface of the package body is positioned below the first surface of the semiconductor die;
a conductive material within the via and contacting the tie bar; and
a lid attached to the conductive material adjacent to the second section of the top surface of the package body to facilitate the electrical connection of the lid to the tie bar, wherein the tie bar comprises;
a generally planar top surface adjacent the top surface of the package body, anda generally planar bottom surface disposed in opposed relation to the top surface and covered by the package body.
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Abstract
In accordance with the present invention, there is provided a semiconductor package wherein a metal lid of the package is used as a shield that effectively surrounds the active circuitry, and thus forms a type of Faraday shield. The lid is electrically coupled to an internal die mounting pad of either a leadframe or an alternative type of substrate. Appropriate interconnect methods between the lid, the die pad, and the ground connections exterior to the semiconductor package include, but are not restricted to, conductive adhesives, wire bonding, bumps, tabs, or similar techniques.
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Citations
18 Claims
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1. A semiconductor package comprising:
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a leadframe including a die pad having at least one tie bar connected thereto and extending therefrom and a plurality of leads extending at least partially about the die pad in spaced relation thereto, each lead having a lead top surface and a lead bottom surface; a semiconductor die having a first surface and a second surface opposed to the first surface, the second surface attached to the die pad and electrically connected to at least some of the leads; a package body covering at least portions of the die pad, the tie bar and the leads where at least some leads each have both the lead top surface at least partially exposed in a top surface of the package body and the lead bottom surface at least partially exposed in a bottom surface of the package body, the package body including at least one via which is formed therein and terminates on the tie bar, the via being laterally surrounded by the package body, wherein; the top surface of the package body includes at least first and second sections, the first section being recessed relative to the second section; the via is formed in the second section of the top surface; the package body is formed such that the die pad, the tie bar and at least some of the leads each include a portion that is exposed in the first section of the top surface; and the top surface of the package body is positioned below the first surface of the semiconductor die; a conductive material within the via and contacting the tie bar; and a lid attached to the conductive material adjacent to the second section of the top surface of the package body to facilitate the electrical connection of the lid to the tie bar, wherein the tie bar comprises; a generally planar top surface adjacent the top surface of the package body, and a generally planar bottom surface disposed in opposed relation to the top surface and covered by the package body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor package comprising:
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a leadframe within a package body, the leadframe comprising a die pad and a plurality of leads extending at least partially about the die pad, each lead having a first surface and an opposing second surface; a semiconductor die having a first major surface and a second major surface opposed to the first major surface, the second major surface attached to the die pad and electrically connected to at least some of the leads; the package body covering at least portions of the leads where at least some leads each have both the first surface at least partially exposed in a top surface of the package body and the second surface at least partially exposed in bottom surface of the package body, the package body including at least one via which is formed therein and extends to a corresponding one of the leads, the via laterally surrounded by the package body; a conductive material within the via and contacting the corresponding one of the leads; and a lid attached to the conductive material to facilitate electrical connection of the lid to the corresponding one of the leads, wherein; the package body includes a bottom surface, and a top surface having at least first and second sections, the first section being recessed relative to the second section; the via is in the second section of the top surface; the lid is attached to the second section of the top surface; and the die pad and at least some of the leads each include a portion exposed in the first section of the top surface. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A semiconductor package comprising:
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a die pad; a semiconductor die attached to the die pad; a plurality of leads extending at least partially about the die pad in spaced relation thereto, the semiconductor die being electrically connected to at least some of the leads, wherein each of the leads has a recessed top surface, a non-recessed top surface, a recessed bottom surface and a non-recessed bottom surface; a package body covering at least portions of the die pad and the leads, the package body including a bottom surface, and a top surface having at least first and second sections, the first section being recessed relative to the second section, with a portion of the non-recessed top surface of at least one of the leads being exposed in the second section and portions of the recessed top surfaces of at least some of the leads being exposed in the first section; and a lid attached to the second section of the top surface of the package body by a conductive material and further attached to the non-recessed top surface of at least one of the leads exposed in the second section by the conductive material such that lid is electrically connected to the non-recessed top surface of at least one of the leads. - View Dependent Claims (16, 17, 18)
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Specification