Semiconductor device and production thereof
First Claim
1. A process of producing a dissolvable metal sheet suitably applicable to production of semiconductor devices, comprising the steps of:
- forming, on one side of a dissolvable metal substrate, a plurality of concavities in positions corresponding to those of electrode terminals of a semiconductor chip or a semiconductor wafer;
filling the concavities with first plated deposits of a first metal;
forming leads on said one side of the substrate, said leads lying on said one side of the substrate and each having at least one curved portion and bonded on one end to at least one of the first plated deposits; and
forming, on the other end of the leads, a plurality of second plated deposits of a second metal having a height greater than that of the leads.
1 Assignment
0 Petitions
Accused Products
Abstract
A semiconductor device comprising a semiconductor chip having an electrode terminal carrying surface and electrode terminals formed on, and carried by, the electrode terminal carrying surface; leads extending substantially parallel to the electrode terminal carrying surface and each having at least one curved portion; a first bump and a second bump which are formed on one and the other ends, respectively, of each of the leads and protrude from the ends in opposite directions toward and away from, respectively, the electrode terminal carrying surface; and the electrode terminals of the semiconductor chip each being bonded to a top of the first bump of the lead to support the leads at a distance from the electrode terminal carrying surface of the semiconductor chip. A process of producing the semiconductor device a dissolvable metal sheet suitably used in the process and a process of producing the metal sheet are also provided.
16 Citations
20 Claims
-
1. A process of producing a dissolvable metal sheet suitably applicable to production of semiconductor devices, comprising the steps of:
-
forming, on one side of a dissolvable metal substrate, a plurality of concavities in positions corresponding to those of electrode terminals of a semiconductor chip or a semiconductor wafer;
filling the concavities with first plated deposits of a first metal;
forming leads on said one side of the substrate, said leads lying on said one side of the substrate and each having at least one curved portion and bonded on one end to at least one of the first plated deposits; and
forming, on the other end of the leads, a plurality of second plated deposits of a second metal having a height greater than that of the leads. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A process of producing a dissolvable metal sheet suitably applicable to production of semiconductor devices, comprising the steps of:
-
forming throughholes extending through a dissolvable metal substrate in positions corresponding to those of electrode terminals of a semiconductor chip or a semiconductor wafer;
filling the throughholes with a low melting point metal;
forming leads on one side of the substrate, said leads lying on said one side of the substrate and each having at least one curved portion and bonded on one end to the low melting point metal filled in the throughholes; and
forming, on the other end of the leads, a plated deposit of a metal having a height greater than that of the leads. - View Dependent Claims (7, 8)
-
-
9. A process for producing a semiconductor device, comprising the steps of:
-
preparing a dissolvable metal sheet including a dissolvable metal substrate having concavities on one side in positions corresponding to those of electrode terminals formed on an electrode terminal carrying surface of a semiconductor chip or a semiconductor wafer; and
leads lying on said one side of the substrate and each having at least one curved portion, a first connection terminal on one end and a second connection terminal on the other end, the first and second connection terminals protruding in opposite directions from said one side of the substrate, the first connection terminals filling the concavities of the substrate, the second connection terminals having a height greater than that of the leads;
the dissolvable metal substrate being dissolvable by an etchant which does not dissolve the leads and the first and second terminals;
placing the metal substrate with said one side being substantially parallel to said electrode terminal carrying surface of the semiconductor chip or the semiconductor wafer and with the second connection terminals being in an aligned contact with said electrode terminals;
bonding the second connection terminals to the electrode terminals;
entirely removing the metal substrate by dissolution with an etchant to expose lead assemblies each composed of the lead having on said one end the first connection terminal forming an external connection terminal and, on said other end, the second connection terminal forming an electrode connection terminal bonded to the electrode terminal to support the lead at a distance from and substantially parallel to said electrode terminal carrying surface of the semiconductor chip or the semiconductor wafer. - View Dependent Claims (10, 11, 12)
-
-
13. A process for producing a semiconductor device, comprising the steps of:
-
preparing a dissolvable metal sheet including a dissolvable metal substrate having concavities on one side in positions corresponding to those of electrode terminals formed on an electrode terminal carrying surface of a semiconductor chip or a semiconductor wafer; and
leads lying on said one side of the substrate and each having at least one curved portion, a first connection terminal on one end and a second connection terminal on the other end, the first and second connection terminals protruding in opposite directions from said one side of the substrate, the first connection terminals filling the concavities of the substrate, the second connection terminals having a height greater than that of the leads;
the dissolvable metal substrate being dissolvable by an etchant which does not dissolve the leads and the first and second terminals;
partially removing the metal substrate by dissolution with an etchant from the other side of the substrate until the first connection terminals are partially exposed;
placing the metal substrate with said one side being substantially parallel to said electrode terminal carrying surface of the semiconductor chip or the semiconductor wafer and with the partially exposed first connection terminals being in an aligned contact with said electrode terminals;
bonding the first connection terminals to the electrode terminals; and
entirely removing the metal substrate by further dissolution with an etchant to expose lead assemblies each composed of the lead having on said one end the first connection terminal forming an electrode connection terminal bonded to the electrode terminal to support the lead at a distance from and substantially parallel to said electrode terminal carrying surface of the semiconductor chip or the semiconductor wafer and, on said other end, the second connection terminal forming an external connection terminal. - View Dependent Claims (14, 15, 16)
-
-
17. A process for producing a semiconductor device, comprising the steps of:
-
preparing a dissolvable metal sheet including a dissolvable metal substrate having throughholes extending therethrough in positions corresponding to those of electrode terminals of a semiconductor chip or a semiconductor wafer;
leads formed on one side of the substrate and each having at least one curved portion, a first connection terminal on one end and a second connection terminal on the other end, the first and second connection terminals protruding in opposite directions from said one side of the substrate, the first connection terminals filling the throughholes of the substrate, the second connection terminals having a height greater than that of the leads; and
the dissolvable metal substrate being dissolvable by an etchant which does not dissolve the leads and the first and second terminals;
placing the metal substrate with said one side thereof being substantially parallel to said electrode terminal carrying surface of said semiconductor chip or the semiconductor wafer and with the second connection terminals being in an aligned contact with said electrode terminals;
bonding the second connection terminals to the electrode terminals;
entirely removing the metal substrate by dissolution with an etchant to expose lead assemblies each composed of the lead having on one end the first connection terminal forming an external connection terminal and, on the other end, the second connection terminal forming an electrode connection terminal bonded to the electrode terminal to support the lead at a distance from, and substantially parallel to, said electrode terminal carrying surface of the semiconductor chip or the semiconductor wafer. - View Dependent Claims (18)
-
-
19. A process for producing a semiconductor device, comprising the steps of:
-
preparing a dissolvable metal sheet including a dissolvable metal substrate having throughholes extending therethrough in positions corresponding to those of electrode terminals of a semiconductor chip or a semiconductor wafer;
leads formed on one side of the substrate and each having at least one curved portion, a first connection terminal on one end and a second connection terminal on the other end, the first and second connection terminals protruding in opposite directions from said one side of the substrate, the first connection terminals filling the throughholes of the substrate and being exposed from the other side of the substrate, the second connection terminals having a height greater than that of the leads; and
the dissolvable metal substrate being dissolvable by an etchant which does not dissolve the leads and the first and second terminals;
placing the metal substrate with said other side being substantially parallel to said electrode terminal carrying surface of said semiconductor chip or the semiconductor wafer and with the first connection terminals exposed from other side being in an aligned contact with said electrode terminals;
bonding the first connection terminals to the electrode terminals;
entirely removing the metal substrate by dissolution with an etchant to expose lead assemblies each composed of the lead having on one end the first connection terminal forming an electrode connection terminal bonded to the electrode terminal to support the lead at a distance from and substantially parallel to said electrode terminal carrying surface of the semiconductor chip or the semiconductor wafer and, on the other end, the second connection terminal forming an external connection terminal. - View Dependent Claims (20)
-
Specification