Abstract:
A leadframe-based semiconductor package is proposed for the packaging of a semiconductor device, such as a multi-media card (MMC) chipset. The proposed semiconductor package is characterized by the use of a leadframe, rather than BT substrate or film, as the chip carrier for MMC chipset. The leadframe includes a supporting bar, a chip-supporting structure arranged at a downset position in relation to the supporting bar; and a plurality of leads, each lead including an outer-lead portion and an inner-lead portion; wherein the outer-lead portion is levelly linked to the supporting bar, while the inner-lead portion is arranged beside the chip-supporting structure and linked to the outer-lead portion via an intermediate-lead portion. The leadframe can be either the type having die pad or the type having no die pad. In the case of the type having die pad, a semiconductor chip is mounted on the die pad; and in the case of the type having no die pad, one or more semiconductor chips are mounted over an elongated part of the inner-lead portions of the leads. The use of leadframe allows the MMC package to be manufactured without having to include a lidding process, so that the MMC manufacture can be carried out in a less complex and more cost-effective manner.
Abstract:
A semiconductor chip package comprises a lead frame having a plurality of leads defining a center area, and a die pad located on the center area of the leads and having at least one downward protuberance on the edge of the die pad; a semiconductor chip attached on the die pad and having a plurality of bonding pads located on the active surface thereof; a plurality of bonding wires connecting the leads and the bonding pads of the semiconductor chip; and a package body encapsulating the lead frame, the semiconductor chip and the bonding wires, wherein the at least one protuberance of the die pad of the lead frame is exposed outside the package body.
Abstract:
A semiconductor device which can improve the connection reliability of solder bumps and productivity in manufacturing. Insulating tape having wiring patterns on its surface is bonded to a lead frame. Semiconductor elements are loaded and circuit formed surfaces and sides of the semiconductor elements are sealed with sealing resin. After arrangements of individual semiconductor devices are formed, the lead frame is separated into individual metal plates to form individual semiconductor devices. Such simultaneous production of a plurality of semiconductor devices enhances productivity, and improves flatness of the insulating tape, whereby the connection reliability of solder bumps is improved.
Abstract:
An electronic package comprises a lead frame having a die pad for supporting a semiconductor chip. The electronic package is characterized by directly mounting at least a surface-mountable device on the lead frame thereby increasing the electric performance of the electronic package. According to an electronic package of the present invention, at least two leads of the lead frame have portions joined together to form a first pad and the die pad has a protruding portion to form a second pad thereby allowing the surface-mountable device to be connected across the first pad and the second pad. The present invention further provides another electronic package comprising a tape attached across the leads of the lead frame for supporting the surface-mountable device.
Abstract:
An semiconductor device package (10) with improved thermal properties that limits unwanted parasitics and provides a more consistent distribution of parasitics from one device to another. The package of the present invention (10) is extremely compact and uses, in one embodiment, a minimal length of bond wires (20 and 22) between the terminals (14 and 16) and the attached device (30). The path length of the package (10) is reduced so as to represent only some fraction of a wavelength relative to the terminals (14 and 16) of the package (10). By reducing the length of the bond wires (20 and 22) and selecting the appropriate dielectric constant of the encapsulant (12), the invention provides a package (10) with a unique hexagonal structure that limits the effects of parasitics and provides good thermal dissipation. In a second and third embodiment of the present invention, the semiconductor device package (10) is useful in optoelectronic devices such light emitting diodes with an anode (71) and a cathode (72). The use of the novel design in this implementation also improves thermal properties and limits unwanted parasitics.
Abstract:
A lead frame that does not tie straps and a die bond pad is rectangular in shape, with the same number of lead frame leads (11) on opposite sides and a different number of lead frame lead frame leads (11) on adjacent sides. Lead frame leads (11) extend into the area in which the tie strap would normally be placed. A heat slug is (30) taped into the lead frame to provide a semiconductor die mount area. At least one lead (11) from one side of the lead frame, located where the tie strap is normally located, is connected via a bond wire (17a, 17b) to a bond pad (19) on the semiconductor die (18) on a side adjacent to the side where the lead frame lead is located.
Abstract:
An ultra-thin semiconductor package includes a lead frame having a die pad and a plurality of leads surrounding the die pad. The die pad includes a chip attaching part to which a semiconductor chip is attached and a peripheral part integral with and surrounding the chip attaching part. The thickness of the chip attaching part is smaller than the thickness of the leads. The package device further includes bonding wires electrically connecting the chip to the leads, and a package body for encapsulating the semiconductor chip, bonding wires, die pad, and inner portions of the leads. A first thickness of the die pad is preferably between about 30-50% of a second thickness of the leads. An overall thickness of the package device is preferably equal to or less than 0.7 mm.
Abstract:
A semiconductor package includes a lead frame having a displaced integral strap which is cupped out of a lead frame plane to provide a nest that receives a semiconductor chip electrically connected to an inner surface of the cupped strap. The semiconductor package further has a housing molded over and encapsulating the semiconductor chip with the frame such that a surface of the semiconductor chip facing away from the cupped strip is flush with or protrudes beyond a bottom of the housing.
Abstract:
A package structure of an integrated circuit is used for electrically connecting to a printed circuit board includes a substrate, an integrated circuit, a plurality of wires, two molded resins. The substrate has a lower surface formed with signal input terminals and signal output terminals, which are to be connected to the signal input terminals. The signal output terminals are electrically connected to the printed circuit board. The integrated circuit has a lower surface for mounting the integrated circuit to the upper surface of the substrate. The two sides on the lower surface of the integrated circuit formed with a plurality of bonding pads. While the integrated circuit mounted to the substrate, the bonding pads are exposed to the outside. The plurality of wires are electrically connected the bonding pads to the substrate. Thus, the signals from the integrated circuit can be transmitted to the substrate. Two molded resins are filled into the two sides of the integrated circuit and the substrate for sealing the plurality of wires to prevent the wires. Thus, the integrated circuit can be made thin, small, and slight.
Abstract:
Fixtures for attaching a semiconductor chip to a substrate. The semiconductor chip has an array of joining material bumps, such as C4 solder balls. The substrate has an array of conductive pads corresponding to the array of joining material bumps. In a first embodiment the fixture has a body having a first cavity for containing the semiconductor chip and a second cavity in communication with the first cavity for containing the substrate. Whereby the substrate is placed over the semiconductor chip with the conductive pads opposing and in contact with the joining material bumps, such that during reflow of the joining material bumps, the weight of the substrate acts against the joining material bumps and aids in the attachment of the semiconductor chip to the substrate to form electrical connections therebetween. In a second embodiment the fixture has a first plate having a first opening for disposal of the semiconductor chip therein, a second plate stacked below the first plate and having a thickness substantially equal to the thickness of the substrate, the second plate further having a second opening opposing the first opening for disposal of the substrate therein, and a third plate stacked below the second plate such that the substrate is flattened in the second opening under the weight of the first plate thereby aiding in the attachment of the joining material bumps to their corresponding conductive pads during solder reflow to form electrical connections therebetween. Methods for use of the fixtures is also provided.