Ribbonfet

RibbonFET is Intel's own brand name for its gate-all-around nanosheet transistor, introduced alongside backside power delivery on Intel 20A and carried forward on Intel 18A, and the name identifies a specific company's device — not the generic gate-all-around concept that TSMC and Samsung each implement under their own separate brand names. At a high level, how RibbonFET reached a shipping product looks like this:

A few things are worth knowing about why RibbonFET is Intel's own device, not a synonym for the gate-all-around concept itself:

Gate-all-around is the physics; RibbonFET is Intel's specific implementation of it. As a transistor channel shortens, the drain starts to influence the potential barrier the gate is supposed to control — a leakage effect every foundry pursuing sub-3nm-class logic has to solve. Wrapping the gate fully around a thin, stacked semiconductor channel restores that control, and RibbonFET is simply Intel's name for the device it built to do this, first disclosed as part of the Intel 20A node and carried into Intel 18A. TSMC's nanosheet transistor on N2 and Samsung's MBCFET on SF3/SF2 solve the identical electrostatic problem with their own separately branded, separately qualified devices — none of the three shares a gate pitch, a yield curve, or a qualification timeline just because all three wrap the gate around a channel.

RibbonFET's debut alongside PowerVia on Intel 20A was Intel's largest single architecture change since adopting FinFET. Every Intel node from Intel 7 through Intel 3 kept the FinFET gate, refining lithography and interconnect around it, so RibbonFET's arrival required Intel to requalify standard-cell libraries, extraction models, and physical-verification rules from scratch — the same scale of change TSMC had to absorb moving from N3's FinFET to N2's nanosheet gate, and Samsung had to absorb building its first MBCFET generation for SF3.

PowerVia is a separate integration decision bundled with RibbonFET, not a property of the gate-all-around shape itself. Backside power delivery moves supply-rail wiring to the wafer's backside so it stops competing with signal wiring on the front-side metal stack, and Intel chose to introduce it in the same node generation as RibbonFET — but a gate-all-around transistor doesn't require backside power on its own, the same point that applies to TSMC pairing N2's nanosheet gate with front-side power before introducing its own backside-power approach later on A16.

RibbonFET 2 is a refinement of RibbonFET, carried into Intel 14A, not a second foundational device. Intel's roadmap material describes RibbonFET 2 alongside PowerDirect on Intel 14A as a further-refined version of the same gate-all-around approach RibbonFET introduced on 20A and 18A — a pattern this whole node-naming series keeps surfacing, where a company's second-generation device name marks a refinement of its own prior brand, not a competing architecture.

Read RibbonFET through a *brand-and-company* lens rather than a *generic-GAA* lens: what RibbonFET names is specifically Intel's gate-all-around transistor, introduced with Intel 20A and carried through Intel 18A, paired with Intel's own PowerVia backside power — not a universal term for every company's wrapped-gate device. RibbonFET's relationship to TSMC's nanosheet and Samsung's MBCFET is the same underlying fact as every other node name in this series: a transistor brand name is a company's own platform, not a ruler the rest of the industry shares.