Patent ID: 6777265
Filing Date: 2004-08-17
Classification: H01L

Abstract:
A method of forming electronic packages having ultrasonic bonded wires comprising the steps of:forming a block of partially etched lead frames, wherein the lead frames, comprising webbed portions and separated from each other by street portions, have a uniform pre-plated bottom surface; attaching chips to chip pad areas on corresponding lead frames, wherein each of the chips are attached to a chip pad area; forming electrical connections between terminals of each chip and electrical lead portions of the corresponding lead frame, the electrical lead portions electrically separated from the chip pad area; ultrasonically bonding wires to the bottom surface of the leadframes; encapsulating the lead frames by applying an encapsulant material over the lead frames and the street portions separating the lead frames; back patterning the bottom surface to remove the webbed portions and the street portions; and singulating the encapsulant material disposed over the street portions to form individual chip scale packages having wires on the bottom surface.