Semiconductor die metal layout for flip chip packaging
First Claim
1. A metal layout on a semiconductor die, comprising:
- a surface metal bonding pad;
a metal region adjacent to said pad and spaced between about 1.0 and 3.0 μ
m from said pad; and
an under bump metal pad overlying said surface metal pad and at least a portion of said adjacent metal region, and connected to said surface metal pad through a via.
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0 Petitions
Accused Products
Abstract
Provided is a semiconductor flip chip die metal layout which provides a flat UBM where surface metal pads are narrower than UBMs in order to accommodate decreased die pitch. This is achieved by depositing a metal region adjacent to and closely spaced from the pad which, together with the pad, is capable of providing a substrate that will result in a substantially flat passivation layer surface on which the UBM is subsequently deposited. The adjacent closely spaced metal region may be provided by bringing metal traces closer to a reduced size surface metal pad (into the die surface area underlying the UBM), and/or by depositing dummy metal similarly near the pad. The dummy metal may also be deposited over the whole chip surface area not occupied by other electrical components.
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Citations
21 Claims
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1. A metal layout on a semiconductor die, comprising:
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a surface metal bonding pad; a metal region adjacent to said pad and spaced between about 1.0 and 3.0 μ
m from said pad; andan under bump metal pad overlying said surface metal pad and at least a portion of said adjacent metal region, and connected to said surface metal pad through a via. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A metal layout on a semiconductor die, comprising:
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a surface metal bonding pad; means adjacent to said pad and spaced between about 1.0 and 3.0 μ
m from said pad for supporting an under bump metal pad; andan under bump metal pad overlying said surface metal pad and at least a portion of said supporting means, and connected to said surface metal pad through a via.
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17. A metal layout on a semiconductor die, comprising:
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a surface metal bonding pad; a metal region laterally adjacent to and spaced apart from said surface metal pad, said adjacent metal region; a solder ball-supporting under bump metal pad overlying said surface metal pad and at least a portion of said adjacent metal region, said under bump metal pad separated from said surface metal pad and said adjacent metal region by only a single layer of dielectric, and connected to said surface metal pad through a via. - View Dependent Claims (18, 19, 20, 21)
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Specification