Increased capacity semiconductor package
First Claim
1. A lead frame, comprising:
- a die pad;
a plurality of tie bars extending outwardly from the die pad;
a frame connecting the tie bars to each other;
a plurality of extended leads extending from the frame toward the die pad at a predetermined pitch, each of the extended leads being of a first length and including first and second lands spaced from the die pad at a predetermined distance, each of the extended leads further having opposed top and bottom surfaces and a half etched portion which is formed between the first and second lands only on the top surface thereof; and
a plurality of normal leads extending from the frame toward the die pad at a predetermined pitch, each of the normal leads being of a second length which is less than the first length and including a third land spaced from the die pad at a predetermined distance, each of the normal leads further having opposed top and bottom surfaces and a half etched portion which is formed between the third land and the frame only on the bottom surface thereof.
5 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a lead frame and a semiconductor device including the same. The lead frame is provided with a die pad, and first, second and third lands sequentially arranged on an outer circumferential edge. The lead frame can separate the first and second lands or the die pad and the first land using a plating layer formed on the lead frame as a mask, instead of using a separate mask by etching after the application of the encapsulant. As a result thereof, a plurality of lands can be formed at low cost, in comparison with a conventional method. Additionally, the first, second and third lands are exposed to the outside through a lower portion of an encapsulant, and can be surface mounted on an external device through the first, second and third lands. A plating layer formed on bottom surfaces of the first, second and third lands of the lead frame and a process for separately plating nickel (Ni)/gold (An), Ni/Pd/Au, or tin (Sn) can be omitted so as to easily surface mount the semiconductor device to the external device.
379 Citations
20 Claims
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1. A lead frame, comprising:
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a die pad; a plurality of tie bars extending outwardly from the die pad; a frame connecting the tie bars to each other; a plurality of extended leads extending from the frame toward the die pad at a predetermined pitch, each of the extended leads being of a first length and including first and second lands spaced from the die pad at a predetermined distance, each of the extended leads further having opposed top and bottom surfaces and a half etched portion which is formed between the first and second lands only on the top surface thereof; and a plurality of normal leads extending from the frame toward the die pad at a predetermined pitch, each of the normal leads being of a second length which is less than the first length and including a third land spaced from the die pad at a predetermined distance, each of the normal leads further having opposed top and bottom surfaces and a half etched portion which is formed between the third land and the frame only on the bottom surface thereof. - View Dependent Claims (2, 3, 4, 5)
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6. A lead frame, comprising:
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a die pad; a plurality of tie bars extending outwardly from the die pad; a frame connecting the tie bars to each other; a plurality of projection leads extending from the die pad at a predetermined pitch, each of the projection leads including a first land, opposed top and bottom surfaces and a half etched portion which is formed between the first land and the die pad only on the top surface thereof; a plurality of second lands extending from the frame toward the die pad at a predetermined pitch, each of the second lands being of a first length; and a plurality of normal leads extending from the frame toward the die pad at a predetermined pitch, each of the normal leads being of a second length which exceeds the first length and including a third land spaced from the die pad at a predetermined distance, each of the normal leads further having opposed top and bottom surfaces and a half etched portion which is formed between the third land and the frame only on the bottom surface thereof. - View Dependent Claims (7, 8, 9, 10)
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11. A lead frame, comprising:
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a die pad; a plurality of tie bars extending outwardly from the die pad; a dambar connecting the tie bars to each other; a land connection bar extending about the die pad in spaced relation thereto and connecting the tie bars to each other; a plurality of first lands extending from the land connection bar toward the die pad at a predetermined pitch; a plurality of extended leads extending from the land connection bar toward the dambar at a predetermined pitch, each of the extended leads including a second land; a plurality of normal leads extending from the dambar toward the die pad at a predetermined pitch, the normal leads alternating with the extended leads; and a plurality of external leads extending outwardly from the dambar at a constant length, each of the external leads being aligned with a respective one of the normal leads. - View Dependent Claims (12, 13, 14, 15)
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16. A lead frame, comprising:
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a die pad; a plurality of tie bars extending outwardly from the die pad; a dambar connecting the tie bars to each other; a plurality of projection leads extending from the die pad toward the dambar at a predetermined pitch, each of the projection leads including a first land; a land connection bar extending about the die pad in spaced relation thereto and connecting the tie bars to each other; a plurality of extended leads extending from the land connection bar toward the dambar at a predetermined pitch, each of the extended leads being of a first length and including a second land; a plurality of normal leads extending from the dambar toward the die pad at a predetermined pitch, each of the normal leads being of a second length which exceeds the first length, the normal leads further alternating with the extended leads; and a plurality of external leads extending outwardly from the dambar at a constant length, each of the external leads being aligned with a respective one of the normal leads. - View Dependent Claims (17, 18, 19, 20)
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Specification