TSMC Lays Out 3nm FinFlex Roadmap Blitz, Talks Performance Uplift At 2nm

TSMC 3nm FinFlex
TSMC revealed some key details about its upcoming nodes during its 2022 North America Technology Symposium, including its 3-nanometer roadmap and what’s in store for its 2-nanometer process. Beyond the technical details, what’s interesting about all this is seeing TSMC going on the offensive, so to speak, about it process technology.
There’s been quite a bit of attention paid to the chip manufacturing side of the equation over the past year or so. Both Intel and TSMC have announced massive investments in new and upgraded fab sites as demand for semiconductors have skyrocketed. Combined with challenges from the pandemic and other factors, the industry at large has been battling a chip shortage that’s permeated the market at practically every end, including game consoles and key components in smart cars.
So in that regard, TSMC appears to be flexing, and with good reason—it has a lot on tap. In particular, TSMC is prepping no less than five 3nm process technologies (N3, N3E, N3P, N3S, and N3X) over the next three years, all of which are based on a “revolutionary” FinFlex technology.

TSMC’s FinFlex Technology Enables Better Design Flexibilty

TSMC FinFlex slide

According to TSMC, FinFlex gives it better design flexibility and makes it easier for chip designers to fine tune performance and power consumption, balanced with cost, all while maximizing transistor density. This is especially important as the market as a whole embraces hybrid CPU designs.

“The TSMC FinFlex innovation offers choices of different standard cells with a 3-2 fin configuration for ultra performance, a 2-1 fin configuration for best power efficiency and transistor density, and a 2-2 fin configuration providing a balance between the two for Efficient Performance,” TSMC explains.

TSMC FinFlex diagram

Shown in the image above is an example of an N3 layout where the chip designer can choose the ideal Fin configuration for each functional block on a chip. A 3-2 Fin enables the fastest clock frequencies and best performance; a 2-2 Fin arrangement offers a balance between performance, power efficiency, and density; and a 2-1 Fin enables the lowest power consumption with the lowest leakage and highest density of the bunch.

Note that FinFlex does not replace customized nodes and specialized libraries, but it’s another way that chip designers can tune their designs based on their power, performance, and cost goals.

TSMC Looks Ahead To 2 Nanometers (2N) In 2025

TSMC roadmap
Beyond its robust 3N FinFlex roadmap, TSMC also talked about its N2 technology. As shown in the roadmap above, N2 is scheduled to begin production in 2025, around the same time as its fifth 3N node (N3X). N2 will also be TSMC’s first node to employ nanosheet-based gate-all-around field-effect transistors, or GAAFETs).

The other technological introduction with N2 is a backside power rail. This goes hand-in-hand with GAAFETs to improve the performance-per-watt proposition.

TSMC N2 slide

TSMC claims its N2 technology will deliver a 10-15 percent speed improvement at the same power versus N3E, or a 25-30 percent power reduction at the same speed. This, according to TSMC, will usher in a new era of efficient performance.

“N2 will feature nanosheet transistor architecture to deliver a full-node improvement in performance and power efficiency to enable next-generation product innovations from TSMC customers. The N2 technology platform includes a high-performance variant in addition to the mobile compute baseline version, as well as comprehensive chiplet integration solutions,” TSMC says.

Interestingly, the improvement in transistor density will in the neighborhood of 10 percent versus N3E. That’s not earth shattering, and N3S could close the gap, albeit on a different process technology. That could set the state for some interesting chip design decisions down the line.

If all goes to plan, TSMC will begin risk production of its 2N node in late 2024, with commercial products expected to arrive in the second half of 2025.

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