Patents by Inventor Rajeev Joshi

Rajeev Joshi 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: 20050218300
    Abstract: An optocoupler package is disclosed. The optocoupler package includes a substrate comprising a leadframe and a molding compound, and a plurality of optocouplers, each optocoupler including (i) an optical emitter, (ii) an optical receiver, (iii) and an optically transmissive medium disposed between the optical emitter and optical receiver, where the optical emitter and the optical receiver are electrically coupled to the leadframe.
    Type: Application
    Filed: April 2, 2004
    Publication date: October 6, 2005
    Inventors: Maria Clemens Quinones, Rajeev Joshi
  • Patent number: 6949410
    Abstract: A chip device that includes a leadframe, a die and a mold compound. The backside of the die is metallized and exposed through a window defined within a mold compound that encapsulates the die when it is coupled to the leadframe. Leads on the leadframe are coupled to source and gate terminals on the die while the metallized backside of the die serves as the drain terminals.
    Type: Grant
    Filed: June 27, 2003
    Date of Patent: September 27, 2005
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Rajeev Joshi, Consuelo N. Tangpuz, Romel N. Manatad
  • Publication number: 20050206010
    Abstract: A multichip module package uses bond wire with plastic resin on one side of a lead frame to package an integrated circuit and flip chip techniques to attach one or more mosfets to the other side of the lead frame. The assembled multichip module 30 has an integrated circuit controller 14 on a central die pad. Wire bonds 16 extend from contact areas on the integrated circuit to outer leads 2.6 of the lead frame 10. On the opposite, lower side of the central die pad, the sources and gates of the mosfets 24, 26 are bump or stud attached to the half etched regions of the lead frame. The drains 36 of the mosfets and the ball contacts 22.1 on the outer leads are soldered to a printed circuit board.
    Type: Application
    Filed: March 18, 2004
    Publication date: September 22, 2005
    Inventors: Jonathan Noquil, Seung Choi, Rajeev Joshi, Chung-Lin Wu
  • Publication number: 20050176233
    Abstract: A packaged semiconductor device (a wafer-level chip scale package) containing no UBM between a chip pad and an RDL pattern is described. As well, the device contains only a single non-polymeric insulation layer between the RDL pattern and the solder bump. The single non-polymeric insulation layer does not need high temperature curing processes and so does not induce thermal stresses into the device. As well, manufacturing costs are diminished by eliminating the UBM between the chip pad and the RDL pattern.
    Type: Application
    Filed: July 11, 2003
    Publication date: August 11, 2005
    Inventors: Rajeev Joshi, Chung- Lin Wu, Sang-Do Lee, Yoon-Hwa Choi
  • Publication number: 20050167848
    Abstract: A chip device that includes a leadframe, a die and a mold compound. The backside of the die is metallized and exposed through a window defined within a mold compound that encapsulates the die when it is coupled to the leadframe. Leads on the leadframe are coupled to source and gate terminals on the die while the metallized backside of the die serves as the drain terminals.
    Type: Application
    Filed: November 5, 2003
    Publication date: August 4, 2005
    Applicant: Fairchild Semiconductor Corporation
    Inventors: Rajeev Joshi, Consuelo Tangpuz, Romel Manatad
  • Publication number: 20050133893
    Abstract: A semiconductor die package is disclosed. In one embodiment, the die package includes a semiconductor die including a first surface and a second surface, and a leadframe structure having a die attach region and a plurality of leads extending away from the die attach region. The die attach region includes one or more apertures. A molding material is around at least portions of the die attach region of the leadframe structure and the semiconductor die. The molding material is also within the one or more apertures.
    Type: Application
    Filed: February 4, 2005
    Publication date: June 23, 2005
    Inventors: Rajeev Joshi, Chung-Lin Wu
  • Publication number: 20050127483
    Abstract: Embodiments of the invention are directed to semiconductor die packages. One embodiment of the invention is directed to a semiconductor die package including, (a) a semiconductor die including a first surface and a second surface, (b) a source lead structure including protruding region having a major surface, the source lead structure being coupled to the first surface, (c) a gate lead structure being coupled to the first surface, and (d) a molding material around the source lead structure and the semiconductor die, where the molding material exposes the second surface of the semiconductor die and the major surface of the source lead structure.
    Type: Application
    Filed: January 31, 2005
    Publication date: June 16, 2005
    Inventors: Rajeev Joshi, Chung-Lin Wu
  • Publication number: 20050104168
    Abstract: Provided are a molded leadless package, and a sawing type molded leadless package and method of manufacturing same. The molded leadless package includes a lead frame pad having first and second surfaces opposite to each other. A semiconductor chip is adhered to the first surface of the lead frame pad. A lead is electrically coupled to the semiconductor chip. A molding material covers the lead frame pad, the semiconductor chip, and the lead and exposes a portion of the lead and a portion of the second surface of the lead frame pad. A step difference is formed between a surface of the molding material covering the second surface of the lead frame pad and the second surface of the lead frame pad itself. The sawing type molded leadless package includes a short-circuit preventing member that is post-shaped or convex, and protruding from the lower surface of the die pad.
    Type: Application
    Filed: November 12, 2004
    Publication date: May 19, 2005
    Inventors: Yoon-hwa Choi, Shi-baek Nam, O-seob Jeon, Rajeev Joshi, Maria Estacio
  • Patent number: 6891256
    Abstract: Embodiments of the invention are directed to semiconductor die packages. One embodiment of the invention is directed to a semiconductor die package including, (a) a semiconductor die including a first surface and a second surface, (b) a source lead structure including protruding region having a major surface, the source lead structure being coupled to the first surface, (c) a gate lead structure being coupled to the first surface, and (d) a molding material around the source lead structure and the semiconductor die, where the molding material exposes the second surface of the semiconductor die and the major surface of the source lead structure.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: May 10, 2005
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Rajeev Joshi, Chung-Lin Wu
  • Patent number: 6867481
    Abstract: A semiconductor die package is disclosed. In one embodiment, the die package includes a semiconductor die including a first surface and a second surface, and a leadframe structure having a die attach region and a plurality of leads extending away from the die attach region. The die attach region includes one or more apertures. A molding material is around at least portions of the die attach region of the leadframe structure and the semiconductor die. The molding material is also within the one or more apertures.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: March 15, 2005
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Rajeev Joshi, Chung-Lin Wu
  • Publication number: 20050051878
    Abstract: A chip device that includes a leadframe that has a die attach cavity. The memory device further includes a die that is placed within the die attach cavity. The die attach cavity is substantially the same thickness as the die. The die is positioned within the cavity and is attached therein with a standard die attachment procedure.
    Type: Application
    Filed: September 11, 2003
    Publication date: March 10, 2005
    Applicant: Fairchild Semiconductor Corporation
    Inventors: Honorio Granada, Rajeev Joshi, Connie Tangpuz
  • Publication number: 20050012225
    Abstract: A packaged semiconductor device (a wafer-level chip scale package) containing a conductive adhesive material as an electrical interconnect route between the semiconductor die and a patterned conductive substrate is described. The patterned conductive substrate acts not only as a substrate, but also as a redistribution layer that converts the dense pad layout of the die to a larger array configuration of the solder balls in the circuit board. Using the invention allows the formation of a lower priced chip scale package that also overcomes the restriction of the die size used in die-sized chip packages and the input-output pattern that can be required by the printed circuit board. Thus, the invention can provide a familiar pitch (i.e.,interface) to the printed circuit board for any small die.
    Type: Application
    Filed: May 24, 2004
    Publication date: January 20, 2005
    Inventors: Seung-Yong Choi, Min-Ho Park, Ji-Hwan Kim, Rajeev Joshi
  • Patent number: 6836023
    Abstract: A semiconductor die package is disclosed. The die package includes a semiconductor die having a first side and a second side, a vertical transistor, and a bond pad at the first side. A passivation layer having a first aperture is on the first side, and the bond pad is exposed through the first aperture. An underbump metallurgy layer is on and in direct contact with the passivation layer. The underbump metallurgy layer is within the first aperture and contacts the bond pad. A dielectric layer comprising a second aperture is on and in direct contact with the underbump metallurgy layer. A solder structure is on the underbump metallurgy layer and is within the second aperture of the dielectric layer.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: December 28, 2004
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Rajeev Joshi, Chung-Lin Wu
  • Publication number: 20040241977
    Abstract: A bumped wafer for use in making a chip device. The bumped wafer includes two titanium layers sputtered altematingly with two copper layers over a non-passivated die. The bumped wafer further includes under bump material under solder bumps contained thereon.
    Type: Application
    Filed: April 5, 2004
    Publication date: December 2, 2004
    Applicant: Fairchild Semiconductor Corporation
    Inventor: Rajeev Joshi
  • Publication number: 20040207052
    Abstract: A semiconductor die package is disclosed. In one embodiment, the semiconductor die package has a substrate. It includes (i) a leadframe structure including a die attach region with a die attach surface and a lead having a lead surface, and (ii) a molding material. The die attach surface and the lead surface are exposed through the molding material. A semiconductor die is on the die attach region, and the semiconductor die is electrically coupled to the lead. The die attach surface and the lead surface can be in different planes.
    Type: Application
    Filed: May 6, 2004
    Publication date: October 21, 2004
    Inventors: Rajeev Joshi, Jonathan A. Noquil, Consuelo N. Tangpuz
  • Patent number: 6806580
    Abstract: A multichip module is disclosed. In one embodiment, the multichip module includes a substrate having a first side and a second side, the first side being opposite to the first side. A driver chip is at the first side of the substrate. A semiconductor die comprising a vertical transistor is at the second side of the substrate. The driver chip and the semiconductor die are in electrical communication through the substrate.
    Type: Grant
    Filed: December 26, 2002
    Date of Patent: October 19, 2004
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Rajeev Joshi, Maria Cristina B. Estacio
  • Publication number: 20040201086
    Abstract: A chip device including two stacked dies. The chip device includes a leadframe that includes a plurality of leads. A first die is coupled to a first side of the leadframe with solder and a second die is coupled to a second side of the leadframe with solder. A molded body surrounds at least a portion of the leadframe and the dies.
    Type: Application
    Filed: April 28, 2004
    Publication date: October 14, 2004
    Applicant: Fairchild Semiconductor Corporation
    Inventor: Rajeev Joshi
  • Publication number: 20040201081
    Abstract: A semiconductor die package is disclosed. In one embodiment, the die package includes a semiconductor die including a first surface and a second surface, and a leadframe structure having a die attach region and a plurality of leads extending away from the die attach region. The die attach region includes one or more apertures. A molding material is around at least portions of the die attach region of the leadframe structure and the semiconductor die. The molding material is also within the one or more apertures.
    Type: Application
    Filed: April 11, 2003
    Publication date: October 14, 2004
    Inventors: Rajeev Joshi, Chung-Lin Wu
  • Publication number: 20040191955
    Abstract: A packaged semiconductor device (a wafer-level chip scale package) containing an adhesive film containing conductive particles sandwiched between a chip with Cu-based stud bumps and a substrate containing a bond pad. Some conductive particles are sandwiched between the stud bump and bond pad to create a conductive path. The wafer level chip scale package is manufactured without the steps of dispensing solder and reflowing the solder and can optionally eliminate the use of a redistribution trace. Using such a configuration increases the reliability of the wafer-level chip scale package.
    Type: Application
    Filed: December 9, 2003
    Publication date: September 30, 2004
    Inventors: Rajeev Joshi, Chung-Lin Wu, Sang-Do Lee, Yoon-Hwa Choi
  • Patent number: 6798044
    Abstract: A chip device including two stacked dies. The chip device includes a leadframe that includes a plurality of leads. A first die is coupled to a first side of the leadframe with solder and a second die is coupled to a second side of the leadframe with solder. A molded body surrounds at least a portion of the leadframe and the dies.
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: September 28, 2004
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Rajeev Joshi