Abstract:
A POP (Package-On-Package) semiconductor device with encapsulating protection of soldered joints between the external leads, primarily comprises a plurality of stacked semiconductor packages and dielectric coating. Each semiconductor package includes at least a chip, a plurality of external leads of leadframe, and an encapsulant where the external leads are exposed and extended from a plurality of sides of the encapsulant. Terminals of a plurality external leads of a top semiconductor package are soldered to the soldered regions of the corresponding external leads of a bottom semiconductor package. The dielectric coating is disposed along the sides of the encapsulant of the bottom semiconductor package to connect the soldered points between the external leads and to partially or completely encapsulate the soldering materials so that the stresses between the soldered joints can be dispersed and no electrical shorts happen.
Abstract:
A semiconductor package with crack-restraining ring surfaces is revealed, primarily comprising a chip carrier, a chip disposed on the chip carrier, and a plurality of belfry-like bumps. The belfry-like bumps are disposed on a plurality of corresponding conductive pads on the bottom surface of the chip carrier as external terminals. Each belfry-like bump has at least a crack-restraining ring surface parallel to the conductive pads and between the top of the belfry-like bump and the conductive pad to prevent the spreading of the soldering cracks and to enhance the soldering strengths at the micro contacts to achieve higher package reliability.
Abstract:
A stackable semiconductor package is revealed, primarily comprising a chip carrier, a chip, and a plurality of bottom bump sets. The chip carrier has a plurality of stacking pads disposed on the top surface and a plurality of bump pads on the bottom surface. The chip is disposed on and electrically connected to the chip carrier. The bottom bump sets are disposed on the corresponding bump pads and each consists of a plurality of conductive pillars. Solder-filling gaps are formed between the adjacent conductive pillars for filling and holding solder paste so that the soldering area can be increase and the anchoring effect can be enhanced due to complicated the soldering interfaces to achieve higher soldering reliability and less cracks at the soldering interfaces.
Abstract:
An IC package with a near-substrate-scale die-attaching layer includes a substrate, a near-substrate-scale die-attaching layer, a chip, a plurality of bonding wires, an encapsulant, and a plurality of solder balls. A plurality of ball pads are formed on the bottom surface of the substrate for solder ball placement. The near-substrate-scale die-attaching layer is formed on the top surface of the substrate covering most of the top surface above the ball pads without extending to the edges of the top surface. The active surface of the chip is attached to a first portion of the near-substrate-scale die-attaching layer and is electrically connected to the substrate by the bonding wires. The encapsulant is formed above the top surface of the substrate to cover a second portion of the near-substrate-scale die-attaching layer extending between the substrate and the encapsulant. Therefore, without adding extra components, the intense thermal stresses imposed on some specific solder balls at the corners of the bottom surface of the substrate or under the edges of the chip will be reduced. During on-board TCT, the solder balls will not easily be broken so that the reliability of IC package is enhanced. Moreover, the near-substrate-scale die-attaching layer is completely encapsulated by the encapsulant 250 to have a better resistance to moisture.
Abstract:
A substrate improving immobilization of ball pads for BGA packages mainly comprises a substrate core, a plurality of ball pads and a solder resist layer. Each of the ball pads has a metal pad and at least a metal nail. The metal pads are adhered on a surface of the substrate core and the metal nails are embedded into but not penetrate the substrate core. The solder resist layer is formed over the substrate core and exposes the metal pads. By utilizing the shapes of the ball pads to increase bonding area between the ball pads and the substrate core, a separation or crack occurring at the interface between the metal pads and the substrate core can be substantially avoided.
Abstract:
A BGA package with encapsulation on substrate bottom comprises a chip, a substrate, a molding compound and a plurality of solder balls. The substrate has a SMT surface placing a plurality of ball pads. The molding compound encapsulates a solder resist layer on the SMT surface of the substrate and has a plurality of through holes exposing the ball pads respectively. The hole diameter of the through holes is greater than that of the openings of the solder resist layer on the substrate to allow the solder balls not to contact the molding compound. The solder balls are disposed in the through holes and are bonded to the exposed ball pads of the substrate thereby enhancing moisture resistance of BGA products and preventing the solder balls from falling because of contact stress of the molding compound.
Abstract:
A ball grid array package structure includes: a substrate having at least one chip bearing area on its upper surface and a plurality of electrical-connecting points on its lower surface; a plurality of chips are arranged on the chip bearing area and electrically connected with those electrical-connecting points; a plurality of through holes penetrating the substrate at the edge of chip bearing area; an encapsulant used to cover those chip and filling those through holes to form a strengthened bump surrounding the chip bearing area on the lower surface of the substrate; and a plurality of conductive balls are respectively arranged on those electrical-connecting points. The present invention utilizes the strengthened bump on the bottom of the substrate to enhance the structure strength of the substrate so as to avoid the warpage of the substrate caused from the stress due to the temperature variation during the package process to affect the following processes.
Abstract:
A lead frame package structure for side-by-side disposed chips including a lead frame, at least two chips, and a package material. The lead frame includes a plurality of inner leads; a plurality of outer leads; and at least two chip carrying areas having different horizontal levels. The chips are of different sizes and are respectively disposed on the chip carrying areas. The package material encapsulate the inner leads, the chip carrying areas and the chips, wherein the outer leads exposed out of the package material extend from the inner leads and have different horizontal levels.
Abstract:
A laminated substrate and the semiconductor package utilizing the substrate are revealed. The laminated substrate primarily comprises a core layer, a first metal layer and a first solder mask disposed on the bottom surface of the core layer, and a second metal layer and a second solder mask disposed on the top surface of the core layer. The two solder masks have different CTEs to compensate potential substrate warpage caused by thermal stresses. Therefore, the manufacturing cost of the substrate can be reduced without adding extra stiffeners nor changing thicknesses of semiconductor packages to suppress substrate warpage during packaging processes. Especially, a die-attaching layer partially covers the second solder mask by printing and is planar after pre-curing for zero-gap die-attaching.
Abstract:
A semiconductor device having linear zigzag(s) for wire bonding is revealed, primarily comprising a chip, a plurality of leads made of a lead frame and a plurality of bonding wires electrically connecting the chip and the leads. At least one of the leads has a linear zigzag including a first finger and a second finger connected each other in a zigzag form. One end of one of the bonding wire is bonded to a bonding pad on the chip and the other end is selectively bonded to either the first finger or the second finger but not both in a manner that the wire-bonding direction of the bonding wire is parallel to or in a sharp angle with the direction of the connected fingers for easy wire bonding processes. Therefore, the semiconductor device can assemble chips with diverse dimensions or with diverse bonding pads layouts by flexible wire-bonding angles at linear zigzag to avoid electrical short between the adjacent leads.