Abstract:
The present invention relates to a method to attach a shape memory alloy wire to a substrate, where the wire is mechanically attached into a 3D structure on the substrate. The present invention also relates to a device comprising a shape memory alloy wire attached to a substrate, where the wire is mechanically attached into a 3D structure on the substrate.
Abstract:
There is provided a bonding wire for a semiconductor device, the bonding wire including a Cu alloy core material and a Pd coating layer formed on a surface thereof, achieving simultaneously improvement in bonding reliability of a ball bonded part in HTS at 175°C to 200°C and an strength ratio (= ultimate strength/0.2% offset yield strength) of 1.1 to 1.6. Containing one or more of Ni, Zn, Rh, in, Ir, and Pt in the wire in a total amount of 0.03 to 2% by mass improves the bonding reliability of the ball bonded part in HTS, and furthermore, making an orientation proportion of a crystal orientation angled at 15 degrees or less to a wire longitudinal direction among crystal orientations in the wire longitudinal direction 50% or more when measuring crystal orientations on a cross-section of the core material in a direction perpendicular to a wire axis of the bonding wire, and making an average crystal grain size in the cross-section of the core material in the direction perpendicular to the wire axis of the bonding wire 0.9 to 1.3 µm provides a strength ratio of 1.6 or less.
Abstract:
There is provided a bonding wire for a semiconductor device including a coating layer having Pd as a main component on a surface of a Cu alloy core material and a skin alloy layer containing Au and Pd on a surface of the coating layer, the bonding wire further improving 2nd bondability on a Pd-plated lead frame and achieving excellent ball bondability even in a high-humidity heating condition. The bonding wire for a semiconductor device including the coating layer having Pd as a main component on the surface of the Cu alloy core material and the skin alloy layer containing Au and Pd on the surface of the coating layer has a Cu concentration of 1 to 10 at% at an outermost surface thereof and has the core material containing either or both of Pd and Pt in a total amount of 0.1 to 3.0% by mass, thereby achieving improvement in the 2nd bondability and excellent ball bondability in the high-humidity heating condition. Furthermore, a maximum concentration of Au in the skin alloy layer is preferably 15 at% to 75 at%.
Abstract:
A semiconductor device (20, 24, 29, 32, 35, 38) includes a die pad (6), a wide gap semiconductor chip (SiC or GaN) (1) mounted on the die pad (6), a porous first sintered Ag layer (16) bonding the die pad (6) and the chip (1), and a reinforcing resin portion (17) covering a surface of the first sintered Ag layer (16) and a part of a side surface of the chip (1) and formed in a fillet shape. The semiconductor device (20, 24, 29, 32, 35, 38) further includes electrodes (1g, 1h, 2, 3, 4) on its main (1a) and back (1b) surfaces, the electrodes (1g, 1h, 2, 3, 4) being electrically connected to leads (7, 9, 11, 39), wherein the electrical connection at the front side is a wire (18, 19, 25, 26) connection and the electrical connection at the back side is the first sintered Ag layer (16). A porous second sintered Ag layer (36) or a second resin portion (30) reinforces the wire bonding portion on the electrode (1g, 2, 3). The semiconductor device (20, 24, 29, 32, 35, 38) further includes a sealing body (third resin) (14) which covers the chip (1), the first sintered Ag layer (16), and a part of the die pad (6).
Abstract:
The present invention provides a method for bonding a contact pad (9) of a power semiconductor (3), which is arranged on a substrate (1), to a metallization (7) of the substrate (1), comprising the steps of bonding at least one bonding means (11) of soft metal between the metallization (7) and the contact pad (9), and positioning the substrate (1) with the power semiconductor (3) and the at least one bonding means (11) of soft metal in a depositing bath for depositing a layer (13) of hard metal on the contact pad (9) and the at least one bonding means (11) of soft metal. The present invention also provides a substrate (1) with a power semiconductor mounted thereon, whereby the substrate (1) comprises metallization (7), the power semiconductor (3) has a contact pad (9), and at least one bonding means (11) of soft metal is bonded between the contact pad (9) and the metallization (7), whereby the at least one bonding means (11) of soft metal and the contact pad (9) have a layer (13) of hard metal deposited thereon.
Abstract:
A reliable semiconductor device is provided which comprises lower and upper IGBTs 1 and 2 preferably bonded to each other by solder, and a wire strongly connected to lower IGBT 1. The semiconductor device comprises a lower IGBT 1, a lower electrode layer 5 secured on lower IGBT 1, an upper electrode layer 6 secured on lower electrode layer 5, an upper IGBT 2 secured on upper electrode layer 6, and a solder layer 7 which connects upper electrode layer 6 and upper IGBT 2. Lower and upper electrode layers 5 and 6 are formed of different materials from each other, and upper electrode layer 6 has a notch 36 to partly define on an upper surface 5a of lower electrode layer 5 a bonding region 15 exposed to the outside through notch 36 so that one end of a wire 8 is connected to bonding region 15. Upper electrode layer 6 can be formed of one material superior in soldering, and also, lower electrode layer 5 can be formed of another material having a high adhesive strength to wire 8.
Abstract:
A reliable semiconductor device is provided which comprises lower and upper IGBTs 1 and 2 preferably bonded to each other by solder, and a wire strongly connected to lower IGBT 1. The semiconductor device comprises a lower IGBT 1, a lower electrode layer 5 secured on lower IGBT 1, an upper electrode layer 6 secured on lower electrode layer 5, an upper IGBT 2 secured on upper electrode layer 6, and a solder layer 7 which connects upper electrode layer 6 and upper IGBT 2. Lower and upper electrode layers 5 and 6 are formed of different materials from each other, and upper electrode layer 6 has a notch 36 to partly define on an upper surface 5a of lower electrode layer 5 a bonding region 15 exposed to the outside through notch 36 so that one end of a wire 8 is connected to bonding region 15. Upper electrode layer 6 can be formed of one material superior in soldering, and also, lower electrode layer 5 can be formed of another material having a high adhesive strength to wire 8.
Abstract:
To provide a metal base circuit board excellent in heat dissipation properties, which remarkably reduces malfunction time of a semiconductor which occurs when a hybrid integrated circuit is operated at a high frequency. A metal base circuit board to be use for a hybrid integrated circuit, comprising circuits provided on a metal plate via an insulating layer (A, B), a power semiconductor mounted on the circuit and a control semiconductor to control the power semiconductor, provided on the circuit, wherein a low capacitance portion is embedded under a circuit portion (pad portion) on which the control semiconductor is mounted, preferably, the low capacitance portion is made of a resin containing an inorganic filler and has a dielectric constant of from 2 to 9.
Abstract:
A method of forming a bump electrode (300) on an electrode includes the steps of forming a ball bond on an IC electrode by a wire bonding apparatus, moving up a bonding capillary, moving the bonding capillary sideway and then downward, bonding an Au wire to the ball bond portion, and cutting the Au wire. The bump electrode (300) has a particular form, with a bump portion (40) having a vertex (7) at a first height above the electrode and a tail portion (50) extending from the bump portion (300) and having a vertex (52) at approximately the same height as the vertex of the bump portion (40). Both vertices have a flattened surface (31a).
Abstract:
Bei einer Vorrichtung zum Thermokompressionsbonden mit einem gegen eine Bondstelle verfahrbaren Kontaktierwerkzeug (Wedge 10) und einem diesem zugeordneten, mit einer Laserstrahlquelle (23) gekoppelten sowie auf einen unterhalb des Wedge (10) zwischen diesem und der Bondstelle (14) angeordneten Bonddraht-Abschnitt gerichteten Lichtwellenleiter (19) ist erfindungsgemäß vorgesehen, daß der Lichtwellenleiter (19) durch den Wedge (10) hindurch bis nahe an den sich unterhalb des Wedge (10) befindlichen Bonddraht-Abschnitt (Meßpunkt 26) herangeführt ist, so daß im wesentlichen nur dieser Abschnitt bei Einkoppelung von Laserenergie auf eine zum Thermokompressionsbonden ausreichende Temperatur erwärmbar ist.