Semiconductor packaging acts as the bridge connecting delicate integrated circuit (IC) silicon dies to the printable circuit boards (PCBs) of larger electronic systems. Traditional packaging used wire bonding to link the peripheral die pads to leadframes (DIP, QFP, SOIC). Modern grid array packaging bypasses wire connections entirely, placing contacts under the chip body as ball grid arrays (BGA).
BGA packages use an intermediate organic or ceramic substrate/interposer to route signals from the die to the solder balls. WLP (Wafer Level Package) places solder balls directly onto the passivated surface of the silicon die, eliminating the substrate completely for the smallest possible footprint.
As silicon chips shrink, their physical die size decreases. However, high-performance chips still require a large number of pins. EWLP embeds the die in a mold compound wafer, providing extra perimeter area to route signals out ("Fan-Out"), avoiding physical pin-count limitations of tiny silicon surfaces.
Fine-pitch arrays (under 0.50mm) require advanced PCB fabrication technologies, such as high-density interconnect (HDI) microvias, laser drilling, and narrow track routing. Larger pitch arrays (0.80mm - 1.0mm) can be routed using standard, lower-cost multilayers.
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