摘要:
Disclosed is a method for forming a die-attach layer during semiconductor packaging processes. A chip carrier includes a substrate core and a stiffener. Top surface of the substrate core includes a plurality of die-attaching units and a peripheral area enclosed by the stiffener. A non-planar printing stencil is also provided. When the non-planar printing stencil is pressed against the chip carrier, the non-planar printing stencil is compliantly in contact with the substrate core and the stiffener and a plurality of printing openings of the non-planar printing stencil exposes the substrate core within the die-attaching units. During stencil printing, die-attach material fills in the printing openings to directly adhere to the substrate core. Therefore, the warpage of the substrate core is restrained to avoid bleeding of die-attach material so that die-attach materials can be formed as a die-attach layer with a uniform thickness on core-exposed chip carrier with lower costs. Additionally, the chip carrier will not be deformed during semiconductor packaging processes.
摘要:
A wiring substrate with tensile-strength enhanced traces primarily comprises a core layer, a plurality of connecting pads, a plurality of traces, and a solder resist where the connecting pads and the traces are disposed on a top of the core layer. The solder resist is formed over the top of the core layer to cover the traces with the connecting pads partially or completely exposed. Furthermore, the traces have I-shaped cross sections to enhance the tensile strength of the traces.
摘要:
A semiconductor device having package-on-package (POP) configuration, primarily comprises a plurality of vertically stacked semiconductor packages and a plurality of electrical connecting components such as solder paste to electrically connect the external terminals of the semiconductor packages such as external leads of leadframes. Each semiconductor package has an encapsulant to encapsulate at least a chip where the encapsulant is movable with respect to the electrical connecting components to absorb the stresses between the vertically stacked semiconductor packages. In one embodiment, a stress-releasing layer is interposed between the vertically stacked semiconductor packages.
摘要:
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.
摘要:
A semiconductor package is revealed, primarily comprising a substrate, a chip disposed on the substrate, and an encapsulant to encapsulate the chip. The substrate has a plurality of dimples formed in its top surface thereof without penetrating through the substrate and located at a non-wiring region outside a chip mounting region. Therefore, without changing the appearance of the semiconductor package, the diffusion path of moisture and the adhesive strength between the encapsulant and the substrate can be increased to achieve functions of anti-humidity and anti-delamination.
摘要:
A BGA package and a substrate for the package are disclosed. A chip is disposed on a top surface of the substrate. A plurality of solder balls are disposed on a plurality of ball pads formed on a bottom surface of the substrate. The substrate has at least a core layer with a plurality of corner cavities filled with low-modulus materials as stress buffer. Additionally, some of the ball pads at the corners of the substrate are disposed under the corner cavities.
摘要:
A MAP (Mold Array Process) for chip encapsulation is disclosed in this invention. First, a substrate strip having a plurality of units is provided. A plurality of chips are disposed on the substrate strip and then an encapsulant is formed made by transfer molding to continuously encapsulate the chips on a plurality of units. Therein, the substrate strip includes at least a first row of units in a one-dimensional array and at least a second row of units in a one-dimensional array and connected with the first row of units in parallel, and the cutting lines between the first row of units are not aligned with those between the second row of units so that the first and second rows of units are disposed in a non-two-dimensional array. Therefore, the mold flows on the cutting lines and on centers of the chips can be balanced merely by means of modifying arrangement of the units without adding obstructions or other extra components to solve conventional encapsulation bubbles generated at sides of the chips.
摘要:
A MAP (Mold-Array-Process) type semiconductor package mainly includes a chip carrier, at least a chip, and an encapsulant. The chip is disposed on the carrier and is electrically connected to the chip carrier. The encapsulant completely covers the upper surface of the chip carrier and encapsulates the chip. Therein, the encapsulant has two mold-flow constraining portions adjacent two opposite sides of the encapsulant, which are lower than the central top surface of the encapsulant and vertically aligned to the corresponding sawed sides of the chip carrier. Therefore, by changing the shape of the encapsulant, the mold flows on the chip and at the sides of the chip carrier will be the balanced to solve encapsulated bubble(s) formed on the rear side of the chip during MAP packaging, and disposition of conventional barrier components will be eliminated.
摘要:
An IC package structure of die face up or die face down is provided with adding the occupied area of die-attaching material. The die-attaching layer is distributed the surface of the substrate exposed by a die and configured for absorbing the thermal stress induced from thermal expansion mismatch of materials generated during a board level temperature cycle test.