Semiconductor device with pad structure
First Claim
1. A semiconductor device comprising:
- semiconductor elements formed in a semiconductor substrate;
a plurality of first conductive pads formed in a first region above and surrounding said semiconductor circuit elements;
a first protective insulating film formed on or above said plurality of first conductive pads and said semiconductor elements, said first protective insulating film having a plurality of first openings for exposing each of said plurality of first conductive pads;
a lead wire including a lower conductive layer of copper which has an end portion connected to one of said plurality of first conductive pads through said first opening and another end portion extending to a second region surrounding said first openings on said first protective insulating film, and including an upper conductive layer made of metal having Vickers hardness greater than 70; and
a second protective insulating film having a second opening formed for exposing said another end portion of said lead wire for serving as a second conductive pad.
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Accused Products
Abstract
A semiconductor device equipped with secondary pads having adequate arrangement for an arbitrary packaging process. The secondary pads are connected with the primary pads of the semiconductor device with a novel lead wire structure, which is characterized by its low electric resistance, good mechanical strength to protect active components of the device, good adhesion to bumps, and anti-electromigration property. The semiconductor device has: semiconductor circuit elements 2 embedded in a semiconductor substrate 1; a plurality of conductive primary pads 4 each formed in a region above, and surrounding, the circuit element 2; a first protective insulation substrate 5 covering the substrate and having first openings 6 for the primary pads 4; lead wires 7 each consisting of a conductive bulk layer 15 made of copper and a metallic top layer 16, the bulk layer formed on the first protective insulation substrate 5 and having one end connected with a corresponding one of the primary pads 4 through an associated opening 6 and the other end located in a region surrounding the opening 6, while the top layer made of a metal having Vickers hardness of more than 100; and a second protective insulation substrate 8 having second openings 9 for exposing the top surfaces of the other ends of the lead wires 7 serving as the secondary pads 17.
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Citations
11 Claims
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1. A semiconductor device comprising:
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semiconductor elements formed in a semiconductor substrate; a plurality of first conductive pads formed in a first region above and surrounding said semiconductor circuit elements; a first protective insulating film formed on or above said plurality of first conductive pads and said semiconductor elements, said first protective insulating film having a plurality of first openings for exposing each of said plurality of first conductive pads; a lead wire including a lower conductive layer of copper which has an end portion connected to one of said plurality of first conductive pads through said first opening and another end portion extending to a second region surrounding said first openings on said first protective insulating film, and including an upper conductive layer made of metal having Vickers hardness greater than 70; and a second protective insulating film having a second opening formed for exposing said another end portion of said lead wire for serving as a second conductive pad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A semiconductor device having an area array bump structure for solder bump, wherein said bump has a mechanically weak portion such that external stress, if applied to said semiconductor device, concentrates at said mechanically weak portion which is a diametrically smallest section of said solder bump, said diameterically smallest section located at the diametrically smallest section of a through-hole having an inner wall of said through-hole is tapered such that an inner diameter of said through-hole decreases towards a mouth of said through-hole, so that said mechanically weak portion of said through-hole is formed at said mouth.
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11. A semiconductor device having an area array bump structure for solder bumps, comprising:
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an insulation substrate provided with bump lands and bonding pads; semiconductor chips which are die bonded on said insulation layer; means for electrically connecting said bonding pads with said semiconductor chips; through-holes each formed in said insulation substrate at positions associated with corresponding bump lands, through-holes having inner walls tapered such that inner diameters of said through-holes decrease towards mouths of said through-holes; solder bumps each filling said through-holes and bonded to corresponding bump lands, where each of said through-holes has a diametrically small section so that said solder filling said through-hole is mechanically weak at said diametrically small section, thereby allowing said solder bump to be easily deformed by external stresses applied to said semiconductor device.
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Specification