Patents by Inventor Long-Ching Wang

Long-Ching Wang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250183123
    Abstract: An interconnected base plate comprises a metal layer, a plurality of metal pads, and a molding encapsulation. The mold compound layer encloses a majority portion of the plurality of metal pads 240. A respective top surface of each of the plurality of metal pads is exposed from a top surface of the molding encapsulation. The respective top surface of said each of the first plurality of metal pads and the top surface of the mold compound layer are co-planar. A power module comprises the interconnected base plate, a plurality of chips, a plurality of bonding wires, a plurality of terminals, a plastic case, and a module-level molding encapsulation. A method, for fabricating an interconnected base plate, comprises the steps of forming a plurality of metal pads; loading a metal layer; forming a molding encapsulation; and applying a singulation process.
    Type: Application
    Filed: January 23, 2025
    Publication date: June 5, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Zhiqiang Niu, Bum-Seok Suh, Long-Ching Wang, Son Tran, Junho Lee, Yueh-Se Ho
  • Publication number: 20250183132
    Abstract: A semiconductor package includes a lead frame, a chip, and a molding encapsulation. The lead frame comprises a die paddle, a first plurality of leads, additional one or more leads, a second plurality of leads, a first tie bar, a second tie bar, a third tie bar, and a fourth tie bar. A respective end surface of each lead of the first plurality of leads, the additional one or more leads, and the second plurality of leads is plated with a metal. A respective end surface of the first tie bar, the second tie bar, the third tie bar, and the fourth tie bar is not plated with the metal. A method for fabricating a semiconductor package includes the steps of providing a lead frame array, mounting a chip, forming a molding encapsulation, applying a trimming process, applying a plating process, and applying a singulation process.
    Type: Application
    Filed: February 6, 2025
    Publication date: June 5, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Madhur Bobde, Long-Ching Wang, Xiaoguang Zeng
  • Publication number: 20250174524
    Abstract: A semiconductor device comprises a semiconductor substrate, a plurality of metal layers, an adhesive layer, a compound layer, and a plurality of contact pads. A thickness of the semiconductor substrate is in a range from 15 ?m to 35 ?m. A thickness of the compound layer is larger than the thickness of the semiconductor substrate. A coefficient of thermal expansion of the compound layer is less than or equal to 9 ppm/° C. A glass transition temperature of the compound layer is larger than 150° C. The plurality of metal layers comprises a first titanium layer, a first nickel layer, a silver layer, a second nickel layer, and a metallic layer. In a first example, the metallic layer is a second titanium layer. In a second example, the metallic layer is a Titanium Nitride (TiN) layer.
    Type: Application
    Filed: January 23, 2025
    Publication date: May 29, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Lin Lv, Shuhua Zhou, Long-Ching Wang, Jun Lu
  • Publication number: 20250157894
    Abstract: A semiconductor package comprises a lead frame, a first field-effect transistor (FET), a second FET, an integrated circuit (IC), a plurality of bond wires, and a molding encapsulation. The lead frame comprises a first die paddle and a second die paddle. The first FET is flipped and attached to the first die paddle. The second FET is flipped and attached to the second die paddle. A method comprises the steps of providing a lead frame comprising a first die paddle and a second die paddle; applying a first adhesive layer; mounting a first FET and a second FET; applying a second adhesive layer; mounting an IC; applying bonding wires; forming a molding encapsulation; and applying a singulation process so as to form a plurality of semiconductor packages.
    Type: Application
    Filed: June 28, 2024
    Publication date: May 15, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Jian Yin, Long-Ching Wang, Sitthipong Angkititrakul, Xiaobin Wang, Bo Chen
  • Publication number: 20250118638
    Abstract: A semiconductor package comprises a first device and a second device. The structure of the first semiconductor device is similar to that of the second semiconductor device. The first semiconductor device comprises a lead frame strip, a first plurality of field effect transistors (FETs), a first plurality of clips, a second plurality of FETs, a second plurality of clips, and a first molding encapsulation. A method is applied to fabricate a plurality of semiconductor packages. The method comprises the steps of providing a lead frame strip, attaching a first plurality of FETs, attaching a first plurality of clips, attaching a second plurality of FETs, attaching a second plurality of clips, and forming a molding encapsulation.
    Type: Application
    Filed: October 10, 2023
    Publication date: April 10, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Madhur Bobde, Long-Ching Wang, Jian Yin, Lin Chen, Ziwei Yu, Xiaobin Wang, Zhiqiang Niu, Kuan-Hung Li
  • Publication number: 20250112132
    Abstract: A semiconductor package comprises a lead frame, a chip, and a molding encapsulation. The lead frame comprises a top plate, a plurality of drain pads, a plurality of slanted sections, a gate pad, and a plurality of source pads. The top plate of the lead frame comprises a thicker region and a thinner region. Each slanted section of the plurality of slanted sections connects a respective drain pad of the plurality of drain pads to the top plate. A respective side surface of each drain pad of the plurality of drain pads is exposed from a side surface of the molding encapsulation. A respective bottom surface of each drain pad of the plurality of drain pads is exposed from a bottom surface of the molding encapsulation. A top surface of the thicker region is exposed from a top surface of the molding encapsulation.
    Type: Application
    Filed: September 29, 2023
    Publication date: April 3, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Zhiqiang Niu, Xiao Zhang, Long-Ching Wang, Guobing Shen, Yan Xun Xue
  • Patent number: 12261101
    Abstract: A semiconductor package includes a lead frame, a chip, and a molding encapsulation. The lead frame comprises a die paddle, a first plurality of leads, additional one or more leads, a second plurality of leads, a first tie bar, a second tie bar, a third tie bar, and a fourth tie bar. A respective end surface of each lead of the first plurality of leads, the additional one or more leads, and the second plurality of leads is plated with a metal. A respective end surface of the first tie bar, the second tie bar, the third tie bar, and the fourth tie bar is not plated with the metal. A method for fabricating a semiconductor package includes the steps of providing a lead frame array, mounting a chip, forming a molding encapsulation, applying a trimming process, applying a plating process, and applying a singulation process.
    Type: Grant
    Filed: June 28, 2022
    Date of Patent: March 25, 2025
    Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Madhur Bobde, Long-Ching Wang, Xiaoguang Zeng
  • Publication number: 20250096081
    Abstract: A semiconductor package comprising a lead frame, a low side field-effect transistor (FET), a high side FET, a metal clip, an interposer, an integrated circuit (IC) controller, and a molding encapsulation. A method, for fabricating a semiconductor package, comprises the steps of: providing a lead frame; attaching a low side FET and a high side FET; mounting a metal clip; attaching an interposer; mounting an IC controller, forming a molding encapsulation; and applying a singulation process.
    Type: Application
    Filed: September 14, 2023
    Publication date: March 20, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Madhur Bobde, Yan Xun Xue, Long-Ching Wang, Jian Yin, Sitthipong Angkititrakul
  • Patent number: 12243808
    Abstract: A semiconductor device comprises a semiconductor substrate, a plurality of metal layers, an adhesive layer, a compound layer, and a plurality of contact pads. A thickness of the semiconductor substrate is in a range from 15 ?m to 35 ?m. A thickness of the compound layer is larger than the thickness of the semiconductor substrate. A coefficient of thermal expansion of the compound layer is less than or equal to 9 ppm/° C. A glass transition temperature of the compound layer is larger than 150° C. The plurality of metal layers comprises a first titanium layer, a first nickel layer, a silver layer, a second nickel layer, and a metallic layer. In a first example, the metallic layer is a second titanium layer. In a second example, the metallic layer is a Titanium Nitride (TiN) layer.
    Type: Grant
    Filed: March 23, 2022
    Date of Patent: March 4, 2025
    Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Lin Lv, Shuhua Zhou, Long-Ching Wang, Jun Lu
  • Publication number: 20250069973
    Abstract: A chip scale semiconductor package comprises a silicon layer, a back side metal layer, and a plurality of front side pads. Each of the plurality of front side pads comprises a respective copper member and a respective solder member. A method comprises the steps of: providing a wafer; grinding the back side of the wafer forming a peripheral ring; applying a metallization process to a grinded surface; removing the peripheral ring; forming a front side seed layer; forming a front side photoresist layer; applying a photolithography process; applying a front side copper plating process; applying a front side solder plating process; stripping the front side photoresist layer; etching the front side seed layer; and applying a singulation process.
    Type: Application
    Filed: August 22, 2023
    Publication date: February 27, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Madhur Bobde, Long-Ching Wang, Zhiqiang Niu, Lin Lv
  • Publication number: 20250070069
    Abstract: A semiconductor package comprises a semiconductor substrate, a plurality of contact pads, a plurality of metal bumps, a metal layer, and a molding encapsulation. A thickness of the semiconductor substrate is less than 35 microns. A first method comprises the steps of providing a device wafer; attaching a first carrier; applying a thinning process; forming a metal layer; applying a first tape; removing the first carrier; applying a first singulation process; removing the first tape; attaching a second carrier; forming a molding encapsulation; removing the second carrier; forming a plurality of metal bumps; applying a second tape; and applying a singulation process and removing the second tape. A second method comprises the steps of providing a device wafer; attaching a carrier; applying a thinning process; forming a metal layer; forming a molding encapsulation; removing the carrier; forming a plurality of metal bumps; and applying a singulation process.
    Type: Application
    Filed: July 25, 2024
    Publication date: February 27, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Lin Lv, Zhen Yang, Shuhua Zhou, Long-Ching Wang
  • Publication number: 20250070049
    Abstract: A semiconductor package comprises a semiconductor substrate, a plurality of contact pads, a seed layer, a first thick metal layer, a second thick metal layer, and a coating metal layer. Direct attachment of the first thick metal layer and the second thick metal layer comprises bonded metal atoms. The first thick metal layer and the second thick metal layer are bonded by an SAB process. A method comprises the steps of providing an upper device portion, providing a lower carrier portion, applying an SAB process, applying a de-bonding process, applying a tape, applying a singulation process, and removing the tape.
    Type: Application
    Filed: September 12, 2024
    Publication date: February 27, 2025
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Lin Lv, Zhen Yang, Shuhua Zhou, Long-Ching Wang
  • Publication number: 20240429140
    Abstract: A semiconductor package comprises two or more chips, a first molding layer, a second molding layer, a third molding layer, a fourth molding layer, a bottom redistribution layer (RDL), a middle RDL, and a top RDL. The two or more chips comprise a first chip and a second chip. The top RDL comprises a first copper plate and a second copper plate. A plurality of vias electrically connect the second copper plate to the second chip. A method comprises the steps of preparing two or more chips; forming a chip-level molding layer; forming a middle RDL; forming a lower-level molding layer; forming a bottom RDL; forming a lowest-level molding layer; forming a top RDL; and forming a top-level molding layer so as to fabricate a semiconductor package.
    Type: Application
    Filed: June 22, 2023
    Publication date: December 26, 2024
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Zhiqiang Niu, Rhys Philbrick, Long-Ching Wang, Chunya Wen, Yan Xun Xue
  • Patent number: 12142548
    Abstract: A semiconductor package comprises a lead frame, a chip, and a molding encapsulation. The lead frame comprises one or more die paddles comprising a first die paddle. The first die paddle comprises one or more through holes, one or more protrusions with grooves on top surfaces of the one or more protrusions, or one or more squeezed extensions. Each of the one or more through holes is filled with a respective portion of the molding encapsulation. Each of the one or more through holes may be of a rectangular shape, a rectangular shape with four filleted corners, a circular shape, or an oval shape. Each of the grooves is filled with a respective portion of the molding encapsulation. A respective side wall of each of the one or more squeezed extensions is of a swallowtail shape. The swallowtail shape directly contacts the molding encapsulation.
    Type: Grant
    Filed: December 30, 2021
    Date of Patent: November 12, 2024
    Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Long-Ching Wang, Xiaoguang Zeng, Mary Jane R. Alin, Hailin Zhou, Guobing Shen
  • Publication number: 20240096768
    Abstract: A semiconductor package includes a lead frame, a low side field-effect transistor (FET), a high side FET, a metal clip, and a molding encapsulation. The low side FET is flipped and is attached to a first die paddle of the lead frame. The lead frame comprises one or more voltage input (Vin) leads; a gate lead; one or more switching node (Lx) leads; a first die paddle; a second die paddle; and an end paddle. Each of an exposed bottom surface of the one or more Lx leads is directly connected to an exposed bottom surface of the end paddle. A longitudinal direction of an exposed bottom surface of the gate lead is perpendicular to a longitudinal direction of each of the exposed bottom surface of the one or more Lx leads. An entirely of each of the one or more Vin leads is of the full thickness.
    Type: Application
    Filed: September 16, 2022
    Publication date: March 21, 2024
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Lin Chen, Long-Ching Wang, Hui Ye
  • Publication number: 20230420340
    Abstract: A semiconductor package includes a lead frame, a chip, and a molding encapsulation. The lead frame comprises a die paddle, a first plurality of leads, additional one or more leads, a second plurality of leads, a first tie bar, a second tie bar, a third tie bar, and a fourth tie bar. A respective end surface of each lead of the first plurality of leads, the additional one or more leads, and the second plurality of leads is plated with a metal. A respective end surface of the first tie bar, the second tie bar, the third tie bar, and the fourth tie bar is not plated with the metal. A method for fabricating a semiconductor package includes the steps of providing a lead frame array, mounting a chip, forming a molding encapsulation, applying a trimming process, applying a plating process, and applying a singulation process.
    Type: Application
    Filed: June 28, 2022
    Publication date: December 28, 2023
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Madhur Bobde, Long-Ching Wang, Xiaoguang Zeng
  • Patent number: 11784141
    Abstract: A semiconductor package comprises a semiconductor substrate, a first metal layer, an adhesive layer, a second metal layer, a rigid supporting layer, and a plurality of contact pads. A thickness of the semiconductor substrate is equal to or less than 50 microns. A thickness of the rigid supporting layer is larger than the thickness of the semiconductor substrate. A thickness of the second metal layer is larger than a thickness of the first metal layer. A method comprises the steps of providing a device wafer; providing a supporting wafer; attaching the supporting wafer to the device wafer via an adhesive layer; and applying a singulaton process so as to form a plurality of semiconductor packages.
    Type: Grant
    Filed: October 5, 2022
    Date of Patent: October 10, 2023
    Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Jun Lu, Long-Ching Wang, Madhur Bobde, Bo Chen, Shuhua Zhou
  • Publication number: 20230307325
    Abstract: A semiconductor device comprises a semiconductor substrate, a plurality of metal layers, an adhesive layer, a compound layer, and a plurality of contact pads. A thickness of the semiconductor substrate is in a range from 15 ?m to 35 ?m. A thickness of the compound layer is larger than the thickness of the semiconductor substrate. A coefficient of thermal expansion of the compound layer is less than or equal to 9 ppm/° C. A glass transition temperature of the compound layer is larger than 150° C. The plurality of metal layers comprises a first titanium layer, a first nickel layer, a silver layer, a second nickel layer, and a metallic layer. In a first example, the metallic layer is a second titanium layer. In a second example, the metallic layer is a Titanium Nitride (TiN) layer.
    Type: Application
    Filed: March 23, 2022
    Publication date: September 28, 2023
    Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Lin Lv, Shuhua Zhou, Long-Ching Wang, Jun Lu
  • Patent number: 11721665
    Abstract: A wafer level chip scale semiconductor package comprises a device semiconductor layer, a backside metallization layer, a film laminate layer, and a metal layer. The device semiconductor layer comprises a plurality of metal electrodes disposed on a front surface of the device semiconductor. Each side surface of the backside metallization layer is coplanar with a corresponding side surface of the device semiconductor layer. Each side surface of the metal layer is coplanar with a corresponding side surface of the film laminate layer. A surface area of a back surface of the backside metallization layer is smaller than a surface area of a front surface of the metal layer.
    Type: Grant
    Filed: May 20, 2022
    Date of Patent: August 8, 2023
    Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Madhur Bobde, Long-Ching Wang, Bo Chen
  • Patent number: 11699627
    Abstract: A method comprises the steps of providing a wafer; applying a redistribution layer, grinding a back side of the wafer; depositing a metal layer; and applying a singulation process. A semiconductor package comprises a metal-oxide-semiconductor field-effect transistor (MOSFET), a redistribution layer, and a metal layer. The MOSFET comprises a source electrode, a gate electrode, a drain electrode and a plurality of partial drain plugs. The source electrode, the gate electrode, and the drain electrode are positioned at a front side of the MOSFET.
    Type: Grant
    Filed: February 26, 2021
    Date of Patent: July 11, 2023
    Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LP
    Inventors: Yan Xun Xue, Long-Ching Wang, Hongyong Xue, Madhur Bobde, Zhiqiang Niu, Jun Lu