Abstract:
A thin power device comprises a substrate having a first set of first contact pads at a front surface of the substrate electrically connecting to a second set of second contact pads at a back surface of the substrate, a through opening opened from the front surface and through the substrate exposing a third contact pad at the back surface of the substrate, a semiconductor chip embedded into the through opening with a back metal layer at a back surface of the semiconductor chip attached on the third contact pad, and a plurality of conductive structures electrically connecting electrodes at a front surface of the semiconductor chip with the corresponding first contact pads in the first sets of first contact pads.
Abstract:
A semiconductor package for power converter application comprises a low-side MOSFET chip and a high-side MOSFET chip stacking one over the other. The semiconductor package may further enclose a capacitor whereas the capacitor may be a discrete component or an integrated component on chip level with the low-side MOSFET. The semiconductor package may further comprise a PIC chip to provide a complete power converter on semiconductor chip assembly package level.
Abstract:
A method for forming a wafer level chip scale (WLCS) package device with a thick bottom metal comprising the step of attaching a lead frame comprising a plurality of thick bottom metals onto a back metal layer of a semiconductor wafer including a plurality of semiconductor chips having a plurality of bonding pads formed on a front surface of each chip, each thick bottom metal is aligned to a central portion of each chip; a plurality of back side cutting grooves are formed along the scribe lines and filled with a package material, the package material are cut through thus forming a plurality of singulated WLCS package devices.
Abstract:
A method for preparing semiconductor devices in a flip chip process comprises forming deep grooves surrounding each of the semiconductor chips; depositing a first plastic package material to form a first plastic package layer covering front surface of the semiconductor wafer and filling the deep grooves; depositing a metal layer at back surface of the semiconductor wafer after grinding; grinding an outermost portion of the metal layer thus forming a ring area located at back surface around edge of the semiconductor wafer not covered by the metal layer; cutting the first plastic package layer, the semiconductor wafer, the metal layer and the first plastic package material filled in the deep grooves along a straight line formed by two ends of each of the deep grooves filled with the first plastic package material; and picking up the semiconductor devices and mounting on a substrate without flipping the semiconductor devices.
Abstract:
A stacked power semiconductor device includes vertical metal oxide semiconductor field-effect transistors and dual lead frames packaged with flip-chip technology. In the method of manufacturing the stacked power semiconductor device, a first semiconductor chip is flip chip mounted on the first lead frame. A mounting clips is connected to the electrode at back side of the first semiconductor chip. A second semiconductor chip is mounted on the second lead frame, which is then flipped and stacked on the mounting clip.
Abstract:
A semiconductor package with connecting plate for internal connection comprise: a plurality of chips each having a plurality of contact areas on a top surface; one or more connecting plates having a plurality of electrically isolated connecting plate portions each connecting a contact area of the semiconductor chips. The method of making the semiconductor package includes the steps of connecting one or more connecting plates to a plurality of semiconductor chips, applying a molding material to encapsulate the chips and the connecting plates, separating a plurality of connecting plate portions of the connecting plates by shallow cutting through or by grinding.
Abstract:
A semiconductor device comprises an aluminum alloy lead-frame with a passivation layer covering an exposed portion of the aluminum alloy lead-frame. Since aluminum alloy is a low-cost material, and its hardness and flexibility are suitable for deformation process, such as punching, bending, molding and the like, aluminum alloy lead frame is suitable for mass production; furthermore, since its weight is much lower than copper or iron-nickel material, aluminum alloy lead frame is very convenient for the production of semiconductor devices.
Abstract:
A wafer-level semiconductor package method comprising the step of providing a first wafer comprising a plurality of first dies each having a first, a second and a third electrodes formed on its front surface; attaching a second die having a fourth and a fifth electrodes formed on its front surface and a sixth electrode formed at its back surface onto each of the first die of the first wafer with the sixth electrode at the back surface of the second die attached and electrically connected to the second electrode at the front surface of the first die; and cutting the first wafer to singulate individual semiconductor packages.
Abstract:
The present invention is directed to a lead-frame having a stack of semiconductor dies with interposed metalized clip structure. Level projections extend from the clip structure to ensure that the clip structure remains level during fabrication.
Abstract:
A semiconductor package is provided with an Aluminum alloy lead-frame without noble metal plated on the Aluminum base lead-frame. Aluminum alloy material with proper alloy composition and ratio for making an aluminum alloy lead-frame is provided. The aluminum alloy lead-frame is electroplated with a first metal electroplating layer, a second electroplating layer and a third electroplating layer in a sequence. The lead-frame electroplated with the first, second and third metal electroplating layers is then used in the fabrication process of a power semiconductor package including chip connecting, wire bonding, and plastic molding. After the molding process, the area of the lead-frame not covered by the molding compound is electroplated with a fourth metal electroplating layer that is not easy to be oxidized when exposing to air.