Amkor Technology, Inc.

Jonathon Greenwood

Frank Joseph Juskey

Robert Francis Darveaux

Anthony LoBianco

Jicheng Yang

A laser module includes an alignment plate having a template plate having a laser diode aperture and a photodiode aperture. A weld plate and a reflector are coupled to the template plate. The structure further includes a heat sink coupled to the alignment plate. A photodiode subassembly is mounted within the photodiode aperture and to the heat sink. Further, a laser diode subassembly is mounted within the laser diode aperture and to the heat sink. In the above manner, the photodiode subassembly, laser diode subassembly and reflected are precisely aligned.

Laser module and optical subassembly

A simple, inexpensive method and apparatus are provided for increasing the thickness of a body molded on a semiconductor package without the need for a new mold, or for reworking the parts of an existing mold. The method includes providing a mold having parts that engage each other at respective interfacial surfaces, and a shim having a selected thickness and an opening through an interior portion thereof. The shim is interposed between the interfacial surfaces of the mold parts such that the mold parts are spaced apart by the thickness of the shim, and such that the mold parts and the shim opening define a cavity in the mold. The length and width of the cavity of the mold thus remain the same, while the height of the cavity, and hence, the thickness of the molded body, is increased by the thickness of the shim.

Method and apparatus for increasing thickness of molded body on semiconductor package

A method includes modifying wettable regions of a leadframe with a laser to form non wettable barriers. Wettable pads are defined with the non wettable barriers. Since the non wettable barriers are formed in a single automated step with the laser, the non wettable barriers are formed at low cost. During flip chip mounting of an electronic component to the leadframe, the non wettable barriers confine solder to the wettable pads. This results in consistent and reliable solder bump formation.

Laser defined pads for flip chip on leadframe package fabrication method

A leadframe includes a lead. The lead includes a wettable pad and a wettable lead surface. A non wettable barrier separates the wettable pad from the wettable lead surface, the non wettable barrier being formed from a modified portion of the leadframe. Solder wets only the wettable pad during formation of a solder bump between the wettable pad and a bond pad of electronic component flip chip mounted to the leadframe. This results in consistent and reliable solder bump formation. Further, the non wettable barrier is formed in a single automated step with a laser and thus at low cost.

Laser defined pads for flip chip on leadframe package

A method for making low cost chip size semiconductor packages (&ldquo;CSPs&rdquo;) includes preparing a substrate having a first surface with metal pads and lands thereon, and an opposite second surface having openings in it through which the lands are exposed. A solder mask is formed over the first surface of the substrate, and has apertures in it through which the metal pads are exposed. At least one vent opening is formed through the substrate and solder mask. A semiconductor die is electrically connected to the substrate through the apertures in the solder mask using the &ldquo;flip chip&rdquo; connection method. A body of an insulative plastic material is formed on the surface of the solder mask that simultaneously overmolds the die and underfills the space between the solder mask and the die in a single step. Solder balls are attached to the lands through the openings in the second surface of the substrate to serve as package input/output terminals.

Growing community of inventors

Phoenix, AZ, United States of America

Jonathon Greenwood