Intel's latest Quark has gotten to 1.5ua sleep current with sram retention. That's not the best ,but that's good enough for many applications. And it's using 22

Intel's latest Quark has gotten to 1.5ua sleep current with sram retention. That's not the best ,but that's good enough for many applications. And it's using 22nm so it may be the cost leader, by far. And that's mostly what counts in embedded.