Electronic component, method for making the same, and lead frame and mold assembly for use therein
DCFirst Claim
1. An electronic component of a resin molded package type, said electronic component comprising:
- (a) an electronic element;
(b) a lead which is electrically connected with said electronic element, said lead having a thin part and having a thick part which is formed to provide a step on a bottom surface of said lead; and
(c) a resin which encapsulates said electronic element and said lead;
wherein a lateral surface of said thick part is exposed at a lower end area of a lateral surface of said resin.
5 Assignments
Litigations
0 Petitions
Accused Products
Abstract
A lead has a thick part having a thickness of 0.2 mm and a thin part having a thickness of 0.1 mm. The thin part is formed having a greater width than the thick part for preventing the lead from slipping from a resin. A semiconductor chip is fixed on the thin part using a conductive adhesive. A lateral surface of the thick part and a lateral surface of the resin are simultaneously formed by a single cut so that the thick part'"'"'s lateral surface is located at a lower end area of the resin'"'"'s lateral surface and these surfaces are exposed forming the same plane. A bottom surface of the thick part projects by from 0.03 mm to 0.05 mm from the resin bottom surface to meet lead stand-off specifications. Thick parts of other leads electrically connected with electrodes on the semiconductor chip with Au wires, are likewise exposed at the resin lateral surface and project from the resin bottom surface. Such arrangements realize high density mounting of electronic components onto a printed board.
237 Citations
29 Claims
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1. An electronic component of a resin molded package type, said electronic component comprising:
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(a) an electronic element; (b) a lead which is electrically connected with said electronic element, said lead having a thin part and having a thick part which is formed to provide a step on a bottom surface of said lead; and (c) a resin which encapsulates said electronic element and said lead; wherein a lateral surface of said thick part is exposed at a lower end area of a lateral surface of said resin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A plate-like lead frame for use in fabrication of an electronic component of a resin molded package type, said lead frame comprising:
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(a) a rectangular exterior frame; (b) a plurality of bridge parts which are formed into a lattice so as to establish connections between a pair of opposite sides of said rectangular exterior frame as well as between another pair of opposite sides thereof; and (c) a plurality of sets of lead parts which extend towards respective lattice open spaces which are horizontally and perpendicularly, and two-dimensionally defined by said bridge parts. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A mold assembly for use in fabrication of an electronic component of a resin molded package type, said mold assembly comprising:
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(a) a lower mold element onto which a lead frame with a plurality of electronic elements which are arranged horizontally and perpendicularly, and two-dimensionally is placed; (b) an upper mold element that defines a plurality of cavities which are horizontally and perpendicularly, and two-dimensionally arranged correspondingly to said plurality of electronic elements and which are communicated with one another at least in one direction; and (c) common gates through which a resin is injected into said plurality of cavities. - View Dependent Claims (27, 28, 29)
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Specification