A semiconductor device manufacturing method includes a preparation step and a sinter bonding step. In the preparation step, a sinter-bonding work having a multilayer structure including a substrate, semiconductor chips, and sinter-bonding material layers is prepared. The semiconductor chips are disposed on, and will bond to, one side of the substrate. Each sinter-bonding material layer contains sinterable particles and is disposed between each semiconductor chip and the substrate. In the sinter bonding step, a cushioning sheet having a thickness of 5 to 5000 μm and a tensile elastic modulus of 2 to 150 MPa is placed on the sinter-bonding work, the resulting stack is held between a pair of pressing faces, and, in this state, the sinter-bonding work between the pressing faces undergoes a heating process while being pressurized in its lamination direction, to form a sintered layer from each sinter-bonding material layer.

A semiconductor device is extremely reliable because a sealant thereof is difficult to deteriorate even when a SiC semiconductor element is energized. The semiconductor device is produced by sealing a SiC semiconductor element 11 mounted on a multilayer substrate 12 and electrically conductive connection members 14 and 18 with a sealant 20 containing an ultraviolet light absorbent.

A semiconductor device is extremely reliable because a sealant thereof is difficult to deteriorate even when a SiC semiconductor element is energized. The semiconductor device is produced by sealing a SiC semiconductor element 11 mounted on a multilayer substrate 12 and electrically conductive connection members 14 and 18 with a sealant 20 containing an ultraviolet light absorbent.

An electronic device includes a first part, and a circuit plate including a circuit substrate, a plating film made of a plating material and being disposed on a front surface of the substrate. The plating film includes a first part region on which the first part is disposed via a first solder, and a liquid-repellent region extending along a periphery side of the first part region in a surface layer of the plating film, and having a liquid repellency greater than a liquid repellency of the plating film. The liquid-repellent region includes a resist region. The plating film includes a remaining portion between the liquid-repellent region and the front surface of the circuit substrate in a thickness direction of the plating film orthogonal to the front surface. The remaining portion is made of the plating material and is free of the oxidized plating material.

An electronic device includes a first part, and a circuit plate including a circuit substrate, a plating film made of a plating material and being disposed on a front surface of the substrate. The plating film includes a first part region on which the first part is disposed via a first solder, and a liquid-repellent region extending along a periphery side of the first part region in a surface layer of the plating film, and having a liquid repellency greater than a liquid repellency of the plating film. The liquid-repellent region includes a resist region. The plating film includes a remaining portion between the liquid-repellent region and the front surface of the circuit substrate in a thickness direction of the plating film orthogonal to the front surface. The remaining portion is made of the plating material and is free of the oxidized plating material.

A semiconductor device including an insulating circuit board. The insulating circuit board has an insulating plate, a plurality of circuit patterns disposed on a front surface of the insulating plate, any adjacent two of the circuit patterns having a gap therebetween, each circuit pattern having at least one corner, each corner being in a corner area that covers the corner and a portion of each gap adjacent to the corner, and a buffer material containing resin, applied at a plurality of corner areas, to fill the gaps in the plurality of corner areas.

A semiconductor device including an insulating circuit board. The insulating circuit board has an insulating plate, a plurality of circuit patterns disposed on a front surface of the insulating plate, any adjacent two of the circuit patterns having a gap therebetween, each circuit pattern having at least one corner, each corner being in a corner area that covers the corner and a portion of each gap adjacent to the corner, and a buffer material containing resin, applied at a plurality of corner areas, to fill the gaps in the plurality of corner areas.

An SIP module includes a plurality of electrical components mounted to an interconnect substrate. The electrical components and interconnect substrate are covered by an encapsulant. A conductive post is formed through the encapsulant. A plurality of openings is formed in the encapsulant by laser in a form of a circuit pattern. A conductive material is deposited over a surface of the encapsulant and into the openings to form an electrical circuit pattern. A portion of the conductive material is removed by a grinder to expose the electrical circuit pattern. The grinding operation planarizes the surface of the encapsulant and the electrical circuit pattern. The electrical circuit pattern can be a trace, contact pad, RDL, or other interconnect structure. The electrical circuit pattern can also be a shielding layer or antenna. An electrical component is disposed over the SIP module and electrical circuit pattern.

An SIP module includes a plurality of electrical components mounted to an interconnect substrate. The electrical components and interconnect substrate are covered by an encapsulant. A conductive post is formed through the encapsulant. A plurality of openings is formed in the encapsulant by laser in a form of a circuit pattern. A conductive material is deposited over a surface of the encapsulant and into the openings to form an electrical circuit pattern. A portion of the conductive material is removed by a grinder to expose the electrical circuit pattern. The grinding operation planarizes the surface of the encapsulant and the electrical circuit pattern. The electrical circuit pattern can be a trace, contact pad, RDL, or other interconnect structure. The electrical circuit pattern can also be a shielding layer or antenna. An electrical component is disposed over the SIP module and electrical circuit pattern.

An electronic device which can suppress peeling off and damaging of the bonding material is provided. The electronic device includes an electronic component, a mounting portion, and a bonding material. The electronic component has an element front surface and an element back surface separated in the z-direction. The mounting portion has a mounting surface opposed to the element back surface on which the electronic component is mounted. The bonding material bonds the electronic component to the mounting portion. The bonding material includes a base portion and a fillet portion. The base portion is held between the electronic component and the mounting portion in the z-direction. The fillet portion is connected to the base portion and is formed outside the electronic component when seen in the z-direction. The electronic component includes two element lateral surface and ridges. The ridges are intersections of the two element lateral surface and extend in the z-direction. The fillet portion includes a ridge cover portion which covers at least a part of the ridges.