Patents by Inventor Pradeep Rai

Pradeep Rai 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: 20250309196
    Abstract: A fanout semiconductor package includes a first mold compound encapsulating a group of semiconductor dies, and a second mold compound encapsulating the first mold compound. A first set of one or more fiducial markers are included within the first mold compound for aligning the semiconductor dies in the first mold compound. A second set of one or more fiducial markers are included outside of the first mold compound and inside the second mold compound for aligning the semiconductor dies in the second mold compound. Passive components may also be mounted outside of the first mold compound and inside the second mold compound.
    Type: Application
    Filed: March 29, 2024
    Publication date: October 2, 2025
    Applicant: Western Digital Technologies, Inc.
    Inventors: Cong Zhang, Xuyi Yang, Cheng-Hsiung Yang, Pradeep Rai, Nagesh Vodrahalli
  • Patent number: 11830849
    Abstract: A semiconductor memory package includes a substrate, a first stack of memory dies, and a second stack of memory dies. The substrate includes a top layer and a bottom layer. The first stack of memory dies is electrically coupled to the top layer of the substrate and includes a controller and a first number of memory dies. The second stack of memory dies is electrically coupled to the top layer of the substrate and includes a second number of memory dies greater than the first number of memory dies. An upper surface of the first stack of memory dies and an upper surface of the second stack of memory dies are substantially coplanar.
    Type: Grant
    Filed: November 4, 2021
    Date of Patent: November 28, 2023
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Saurabh Nilkanth Athavale, Shrikar Bhagath, Pradeep Rai
  • Publication number: 20230133965
    Abstract: A semiconductor memory package includes a substrate, a first stack of memory dies, and a second stack of memory dies. The substrate includes a top layer and a bottom layer. The first stack of memory dies is electrically coupled to the top layer of the substrate and includes a controller and a first number of memory dies. The second stack of memory dies is electrically coupled to the top layer of the substrate and includes a second number of memory dies greater than the first number of memory dies. An upper surface of the first stack of memory dies and an upper surface of the second stack of memory dies are substantially coplanar.
    Type: Application
    Filed: November 4, 2021
    Publication date: May 4, 2023
    Applicant: Western Digital Technologies, Inc.
    Inventors: Saurabh Nilkanth Athavale, Shrikar Bhagath, Pradeep Rai
  • Patent number: 11552040
    Abstract: A method is disclosed herein. The method includes dicing a wafer and applying a mask. The method includes spraying die bond material, at a first temperature, to a surface of the wafer and cooling the die bond material at a second temperature to at least partially solidify the die bond material. The method also includes removing the mask from the wafer through the die bond material. After the removing of the mask, the method includes curing the die bond material to form a die attach film layer on the wafer.
    Type: Grant
    Filed: July 21, 2020
    Date of Patent: January 10, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventors: Siqi Zhang, Xu Wang, Pradeep Rai, Shrikar Bhagath
  • Publication number: 20220406695
    Abstract: A semiconductor device package includes a semiconductor device with a ball grid array having a first subset of solder balls composed of metallic solder, and a second subset of solder balls composed of a composite material that includes a polymer core surrounded by a solder layer. The solder balls of the second subset can have a lower elastic modulus than the solder balls of the first subset and resist cracking due to thermal stresses on the semiconductor device package. In one embodiment, at least a portion of the second subset of solder balls is located on the periphery of the ball grid array such that the first subset of solder balls may be surrounded, at least partially, by the second subset of solder balls.
    Type: Application
    Filed: June 22, 2021
    Publication date: December 22, 2022
    Applicant: Western Digital Technologies, Inc.
    Inventors: Siqi Zhang, Xu Wang, Wei Wang, Yangming Liu, Pradeep Rai
  • Publication number: 20220028819
    Abstract: A method is disclosed herein. The method includes dicing a wafer and applying a mask. The method includes spraying die bond material, at a first temperature, to a surface of the wafer and cooling the die bond material at a second temperature to at least partially solidify the die bond material. The method also includes removing the mask from the wafer through the die bond material. After the removing of the mask, the method includes curing the die bond material to form a die attach film layer on the wafer.
    Type: Application
    Filed: July 21, 2020
    Publication date: January 27, 2022
    Applicant: Western Digital Technologies, Inc.
    Inventors: Siqi ZHANG, Xu WANG, Pradeep RAI, Shrikar BHAGATH
  • Publication number: 20170179101
    Abstract: A semiconductor device, and a method of its manufacture, are disclosed. The semiconductor device includes a semiconductor die, such as a controller die, mounted on a surface of a substrate. A bridge structure is also mounted to the substrate, with the semiconductor die fitting within a trench formed in a bottom surface of the bridge structure. The bridge structure may be formed from a semiconductor wafer into either a dummy bridge structure functioning as a mechanical spacer layer, or an IC bridge structure functioning as both a mechanical spacer layer and an integrated circuit semiconductor die. Memory die may also be mounted atop the bridge structure.
    Type: Application
    Filed: March 1, 2017
    Publication date: June 22, 2017
    Applicants: SANDISK SEMICONDUCTOR (SHANGHAI) CO., LTD., SANDISK INFORMATION TECHNOLOGY (SHANGHAI) CO., LTD.
    Inventors: Junrong Yan, Peng Lu, Weili Wang, Li Wang, Pradeep Rai, Jeff Xue, Zhong Lu
  • Patent number: 9462694
    Abstract: A semiconductor device, and a method of its manufacture, are disclosed. The semiconductor device includes a semiconductor die, such as a controller die, mounted on a surface of a substrate. A spacer layer is also mounted to the substrate, with the semiconductor die fitting within an aperture or a notch formed through first and second major opposed surfaces of the spacer layer. Additional semiconductor die, such as flash memory die, may be mounted atop the spacer layer.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: October 4, 2016
    Assignee: SanDisk Semiconductor (Shanghai) Co. Ltd.
    Inventors: Junrong Yan, Weili Wang, Li Wang, Pradeep Rai, Xin Lu, Jianbin Gu, Peng Lu
  • Publication number: 20150187421
    Abstract: A semiconductor device, and a method of its manufacture, are disclosed. The semiconductor device includes a semiconductor die, such as a controller die, mounted on a surface of a substrate. A spacer layer is also mounted to the substrate, with the semiconductor die fitting within an aperture or a notch formed through first and second major opposed surfaces of the spacer layer. Additional semiconductor die, such as flash memory die, may be mounted atop the spacer layer.
    Type: Application
    Filed: December 5, 2014
    Publication date: July 2, 2015
    Applicant: SANDISK SEMICONDUCTOR (SHANGHAI) CO., LTD.
    Inventors: Junrong Yan, Weili Wang, Li Wang, Pradeep Rai, Xin Lu, Jianbin Gu, Peng Lu
  • Publication number: 20150155247
    Abstract: A semiconductor device, and a method of its manufacture, are disclosed. The semiconductor device includes a semiconductor die, such as a controller die, mounted on a surface of a substrate. A bridge structure is also mounted to the substrate, with the semiconductor die fitting within a trench formed in a bottom surface of the bridge structure. The bridge structure may be formed from a semiconductor wafer into either a dummy bridge structure functioning as a mechanical spacer layer, or an IC bridge structure functioning as both a mechanical spacer layer and an integrated circuit semiconductor die. Memory die may also be mounted atop the bridge structure.
    Type: Application
    Filed: November 18, 2014
    Publication date: June 4, 2015
    Applicants: SANDISK SEMICONDUCTOR (SHANGHAI) CO., LTD., SANDISK INFORMATION TECHNOLOGY (SHANGHAI) CO., LTD.
    Inventors: Junrong Yan, Peng Lu, Weili Wang, Li Wang, Pradeep Rai, Jeff Xue, Zhong Lu