The 250 nm process (250 nanometer process or 0.25 μm process) is a level of semiconductor process technology that was reached by most manufacturers in the 1997–1998 timeframe.
Products featuring 250 nm manufacturing process
The DECAlpha 21264A, which was made commercially available in 1999.
The AMD K6-2Chomper and Chomper Extended. Chomper was released on May 28, 1998.