Package
Packaging is the step that turns a finished, fragile silicon die into a usable component: it protects the chip mechanically and environmentally, connects its microscopic on-chip pads to a board-sized set of external leads or balls, and carries away the heat it generates — all without degrading the electrical signal the die worked so hard to produce.
Wire bonding is the older, simpler, still-dominant connection method. The die sits face-up on the substrate, and hair-thin gold or copper wires are individually looped from each bond pad on the die up and over to a matching lead on the package — fast, flexible for low-to-medium pin counts, and tolerant of imperfect substrates, which is why it still covers the majority of packaged chips by volume despite being decades old.
Flip chip inverts the whole approach. The die is flipped face-down, and tiny solder bumps on its pads connect directly downward onto matching pads on the substrate — no wires at all. That shorter, more direct path has much lower inductance and resistance, which matters enormously for high pin-count, high-speed, or high-power chips where a wire bond's parasitic inductance would degrade signal integrity or waste power. The trade-off is that it demands tighter alignment and a substrate built to flip-chip tolerances, raising both complexity and cost.
Advanced packaging — 2.5D and 3D integration — exists because a single monolithic die eventually hits its own limits. A 2.5D package places multiple dies side-by-side on a shared silicon interposer, wiring them together through the interposer rather than a slower, longer board-level connection — the same approach behind high-bandwidth-memory-to-processor links in modern AI accelerators. 3D packaging goes further, stacking dies directly on top of each other connected through-silicon vias (TSVs), trading additional process complexity for dramatically shorter interconnects and a smaller footprint.
Yes — ChipFoundryServices offers packaging and assembly as a service. Our in-house facilities support wire bond (up to 10M units/month), flip chip (up to 1M units/month), and advanced 2.5D/3D packaging across standard formats (QFN, QFP, BGA, CSP) as well as custom package development, with package design, thermal analysis, and reliability qualification included. Typical lead times run 3–6 weeks, with per-unit costs from roughly $0.10 to $50 depending on package complexity and volume, from prototype runs of 100 units up to 10M+ units per year.