Motorola Corporation

Lonnie L Bernardoni

Thomas J Swirbel

Anthony B Suppelsa

Frank J Juskey, Jr

Kenneth R Thompson

John K Arledge

Barry M Miles

Bruce J Freyman

Todd W Roshitsh

James A Zollo

Scott M Engstrom

Edward J Hall

Andrzej T Guzuk

Ved V Gundotra

A substrate (100) includes a surface (102) having a hook and loop fastener area (106). The area (106) is selectively metallized to produce interconnect points (108). The area (106) is used to attach a connector, another substrate, or a flex circuit to the substrate (100) without the use of solder or other conductive adhesives. The area (106) provides for the mechanical coupling. The selectively metallized areas (108) provide for the electrical coupling of the two substrates.

Low profile mechanical interconnect system having metalized loop and

An electronic circuit assembly (100) includes a circuit carrying substrate (150) on which electrical components (130) are mounted using solder deposits (125) having an essentially planar surface. A solder deposit (125) is created by forming a recess (155) in the substrate (150), providing a metallic pad (110) about the recess (155), depositing solder paste (120) on the metallic pad (110), and reflowing the solder paste (120) on the metallic pad (110). The electronic circuit (100) is assembled by placing electrical components (130) on the substrate (150) having solder deposits (125), and by further reflowing the solder deposits (125) on the metallic pad (110).

Method for forming solder deposit on a substrate

A partially overmolded integrated circuit package (10) comprises a substrate (14) having circuit traces (11) and a semiconductor die receiving area (15) for attachment of a semiconductor die to the semiconductor die receiving area. Conductive bumps (18) are then applied to a plurality of contact pads on the semiconductor die. Then overmolding compound (16) is applied over the semiconductor die and a portion of the conductive bumps, leaving a portion of the conductive bumps partially exposed (19). Finally, interconnections (13) between the exposed portion of the conductive bumps and the circuit traces of the substrate are formed.

Method and apparatus for partially overmolded integrated circuit package

A method of making a pad array chip carrier package is disclosed. A semiconductor device (10) is bonded to a ceramic substrate (12). The semiconductor device may be attached to the substrate by wirebonding, tab bonding or flip chip bonding. The bonded assembly (16) is then attached to a flexible temporary support substrate (18) by means of an adhesive (19). The entire assembly is then placed into a mold cavity (20 and 22) and registered against the temporary support substrate (18). Plastic material (30) is molded about the semiconductor device and associated wirebonds in order to encapsulate the device. After removal from the mold, the encapsulated assembly is removed from the temporary support substrate (18) by peeling the temporary support substrate (18) from the circuit substrate.

Method of making a transfer molded semiconductor device

An electronic component (14) is soldered to a circuit carrying substrate (11) by a method that allows the component to remain in better contact with the flat solder pads of the substrate. The circuit carrying substrate (11) has a plurality of solder pads (12) disposed thereon, each pad consisting of a terminal portion (16), a solder reservoir portion (18), and a bridging portion (17). The terminal portion is connected to the reservoir portion by the bridging portion. The bridging portion is typically a necked down portion of the pad. The electronic component (14) has a plurality of solderable terminals (15) corresponding to the terminal portions (16) of the solder pads (12). Each of the solder pad reservoir portions are coated with a reservoir of solder (23). The amount of solder coated onto the reservoir portion is sufficient to provide a fillet between the component (14) and the solder pad terminal portion (16) during a subsequent heating step. A flux (25) is then applied to the solder pad terminal portions (16), and the electronic component (14) is placed on the circuit carrying substrate so that each of component terminals is in the flux and contacts the terminal portions of the solder pads. The entire assembly is then heated to melt the solder, thereby causing the melted solder to flow across the solder pad bridging portion and form a fillet between the solder pad terminal portion and the component terminal.

Soldering method

A stackable surface mount electronic component assembly 100 allowing for the stacking of electronic components 108, and 112 is disclosed. The stackable surface mount electronic component assembly 100 includes electronic component carriers 102, and 114, each having an electronic component 108, and 112 respectively. The two carriers 102, and 114, are electrically interconnected by the use of solder balls 106. Electronic component carrier 114 is in turn attached to an external printed circuit board by the use of solder balls 110. Optionally, each of the electronic components 108, 112 can be encapsulated using encapsulation material prior to the joining of the two carriers 102, and 114. In an alternate embodiment recesses 302 are located on top of the elevated peripheral edge 116 allowing for the proper alignment of the two carriers 102, and 114.

Electronic component assembly

A shielded low-profile electronic component assembly 100 providing shielding for electronic components is disclosed which includes a substrate 124, and shield 102. In a first embodiment the shield 102 is chamfered at each shield corner 110 and is attached to the substrate 124 at ground pad patterns 114, which are found at each corner of the substrate 124 on surface 128. A ground paddle 120 is also located in substrate 124 which lies substantially underneath the electronic component 112, and is utilized in maximizing shielding. In an alternate embodiment a substrate 124 is overmolded with encapsulation material 302 after the electronic component 112 is affixed to the substrate 124, with each of the encapsulation material corners 306 being chamfered exposing ground pads 114. The metallized shield 310 is then placed over the overmolded encapsulant and attached to the substrate 124 at ground pad patterns 114. The overmolded encapsulant 302 adding protection to the electronic component 112. In a third embodiment the metallized shield is slightly smaller in area than the substrate 124 and is attached at each of the four ground pads 114, with the shield edges 204 resting on substrate 124.

Shielded low-profile electronic component assembly

A transfer molded pad array chip carrier is formed by mounting and wirebonding a semiconductor device (12) on a printed circuit board (10). The bottom side of the printed circuit board may have an array of solderable surfaces (24). A polymer coating (18) is applied over the semiconductor device (12), the wirebonds (16), and the top side of the printed circuit board (10) and cured. The coating (18) is then sputter etched in a partial vacuum to enhance the adhesion of the transfer molding compound (20) to the printed circuit board (10). The semiconductor device is encapsulated by a transfer molding process. The polymer coating (18) also provides a barrier to alpha particle emission, improves the moisture resistance of the completed package and reduces stress at the surface of the device.

Growing community of inventors

Coral Springs, FL, United States of America

Lonnie L Bernardoni