Semiconductor device with leadframe configured to facilitate reduced burr formation
First Claim
1. A semiconductor device, comprising:
- a generally planar die pad defining multiple peripheral edge segments;
a plurality of first leads segregated into at least two sets that extend along respective ones of at least two peripheral edge segments of the die pad in spaced relation thereto, wherein the first leads include a first segment having a recessed bottom surface that extends to a distal end proximate to a corresponding peripheral edge segment of the die pad, a second segment having a recessed top surface that extends to a corresponding edge of the semiconductor device, and a third segment between the first and second segments of the first leads, wherein the third segments of the first leads have a thickness, and wherein the second segments of the first leads are recessed to a depth from 10% to 90% of the thickness of the third segments of the first leads;
a plurality of second leads segregated into at least two sets that extend along respective ones of at least two peripheral edge segments of the die pad in spaced relation thereto, wherein the second leads includes a first segment having a recessed bottom surface that extends to a distal end proximate to a corresponding peripheral edge segment of the die pad, a second segment having a recessed bottom surface that extends to a corresponding edge of the semiconductor device, and a third segment between the first and second segments of the second leads, wherein the third segments of the second leads have a thickness, and wherein the second segments of the second leads are recessed to a depth from 10% to 90% of the thickness of the third segments of the second leads, and wherein the third segments of the plurality of second leads have sidewalls that are substantially devoid of recessed surfaces to maximize contact area;
a semiconductor die attached to the die pad and electrically connected to at least some of the first and second leads; and
a package body defining generally planar bottom and side surfaces, the package body at least partially encapsulating the first and second leads and the semiconductor die such that at least portions of the first and second leads are exposed in the bottom and side surfaces of the package body and the first segments of the first leads and the first segments of the second leads are encapsulated by the package body;
the first and second leads being configured such that the portions thereof that are exposed in the side surface are arranged at differing relative elevations; and
further comprising at least one tie bar extending from a corner region of the die pad, the at least one tie bar having a recessed bottom surface along its entire length, the recessed bottom surface of the at least one tie bar covered by the package body.
4 Assignments
0 Petitions
Accused Products
Abstract
A semiconductor package or device including a uniquely configured leadframe defining a plurality of leads which are arranged and partially etched in a manner facilitating a substantial reduction in burr formation resulting from a saw singulation process used to complete the fabrication of the semiconductor device. The semiconductor device includes a die pad defining multiple peripheral edge segments. In addition, the semiconductor device includes a plurality of leads which are provided in a prescribed arrangement. Connected to the top surface of the die pad is at least one semiconductor die which is electrically connected to at least some of the leads. At least portions of the die pad, the leads, the lands, and the semiconductor die are encapsulated by the package body, with at least portions of the bottom surfaces of the die pad and the leads being exposed in a common exterior surface of the package body.
-
Citations
18 Claims
-
1. A semiconductor device, comprising:
-
a generally planar die pad defining multiple peripheral edge segments; a plurality of first leads segregated into at least two sets that extend along respective ones of at least two peripheral edge segments of the die pad in spaced relation thereto, wherein the first leads include a first segment having a recessed bottom surface that extends to a distal end proximate to a corresponding peripheral edge segment of the die pad, a second segment having a recessed top surface that extends to a corresponding edge of the semiconductor device, and a third segment between the first and second segments of the first leads, wherein the third segments of the first leads have a thickness, and wherein the second segments of the first leads are recessed to a depth from 10% to 90% of the thickness of the third segments of the first leads; a plurality of second leads segregated into at least two sets that extend along respective ones of at least two peripheral edge segments of the die pad in spaced relation thereto, wherein the second leads includes a first segment having a recessed bottom surface that extends to a distal end proximate to a corresponding peripheral edge segment of the die pad, a second segment having a recessed bottom surface that extends to a corresponding edge of the semiconductor device, and a third segment between the first and second segments of the second leads, wherein the third segments of the second leads have a thickness, and wherein the second segments of the second leads are recessed to a depth from 10% to 90% of the thickness of the third segments of the second leads, and wherein the third segments of the plurality of second leads have sidewalls that are substantially devoid of recessed surfaces to maximize contact area; a semiconductor die attached to the die pad and electrically connected to at least some of the first and second leads; and a package body defining generally planar bottom and side surfaces, the package body at least partially encapsulating the first and second leads and the semiconductor die such that at least portions of the first and second leads are exposed in the bottom and side surfaces of the package body and the first segments of the first leads and the first segments of the second leads are encapsulated by the package body; the first and second leads being configured such that the portions thereof that are exposed in the side surface are arranged at differing relative elevations; and further comprising at least one tie bar extending from a corner region of the die pad, the at least one tie bar having a recessed bottom surface along its entire length, the recessed bottom surface of the at least one tie bar covered by the package body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A semiconductor device, comprising:
-
a die pad; a plurality of first leads that extend at least partially about the die pad in spaced relation thereto, wherein each first lead includes a first segment having a bottom etched surface that extends to a distal end proximate to a peripheral edge segment of the die pad, a second segment having a recessed top surface that extends to a corresponding edge of the semiconductor device, and a third segment between the first and second segments of the first leads, wherein the third segments of the first leads have a thickness, and wherein the second segments of the first leads are recessed to a depth from about 10% to about 90% of the thickness of the third segments of the first leads; a plurality of second leads that extend at least partially about the die pad in spaced relation thereto, wherein each second lead includes a first segment having a bottom etched surface that extends to a distal end proximate to a peripheral edge segment of the die pad, a second segment having a recessed bottom surface that extends to a corresponding edge of the semiconductor device, and a third segment between the first and second segments of the second leads, wherein the third segments of the second leads have a thickness, and wherein the second segments of the second leads are recessed to a depth from about 10% to about 90% of the thickness of the third segments of the second leads, and wherein the third segments of the plurality of second leads have sidewalls that are substantially devoid of recessed surfaces; a semiconductor die attached to the die pad and electrically connected to at least some of the first and second leads; and a package body defining a side surface, the package body at least partially encapsulating the first and second leads and the semiconductor die such that at least portions of the first and second leads are exposed in the side surface of the package body, and wherein the package body completely encapsulates the first segment of each first lead and the first segment of each second lead; the first and second leads being configured such that the portions thereof which are exposed in the side surface are arranged at differing relative elevations; and wherein a portion of the die pad is exposed in the package body, and wherein at least one adjacent pair of first leads is disposed proximate to a corner region of the semiconductor device, and wherein the first segments of the pair of first leads have different shapes. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. A semiconductor device, comprising:
-
a die pad; a plurality of first leads that extend at least partially about the die pad in spaced relation thereto, wherein each first lead includes a first segment having a bottom etched surface that extends to a distal end proximate to a corresponding peripheral edge segment of the die pad, a second segment having a top etched surface that extends to a corresponding edge of the semiconductor device, and a third segment between the first and second segments of each first lead, and wherein the second segment of each first lead is etched to a depth between about 10% to about 90% of the thickness of the third segment of each first lead, and wherein at least one adjacent pair of first leads is disposed proximate to a corner region of the semiconductor device, and wherein the first segments of the at least one adjacent pair of first leads have different shapes; a plurality of second leads that extend at least partially about the die pad in spaced relation thereto, wherein each second lead includes a first segment having a bottom etched surface that extends to a distal end proximate to a corresponding peripheral edge segment of the die pad, a second segment having a bottom etched surface that extends to a corresponding peripheral edge of the semiconductor device and a third segment between the first and second segments of each second lead, the third segment having a thickness, and wherein the second segment of each second lead is etched to a depth between about 10% to about 90% of the thickness of the third segment of each second lead, and wherein the first segments of the second leads are substantially confined to end portions of the third segments of the plurality of second leads to maximize contact area of the third segments; a semiconductor die attached to the die pad and electrically connected to at least some of the first and second leads; and a package body defining generally planar bottom and side surfaces, the package body at least partially encapsulating the first and second leads and the semiconductor die such that at least portions of the first and second leads are exposed in the bottom and side surfaces of the package body, wherein the package body encapsulates the first segments of each first lead and the first segments of each second lead; the second segments of the first and second leads being configured such that the portions thereof that are exposed in the side surface are arranged at differing relative elevations. - View Dependent Claims (17, 18)
-
Specification