Exhibit 12.1 Fairchild Semiconductor Corporation Computation of Ratio of Earnings to Fixed Charges (Dollars in millions) Seven Months Ended Year Ended Year Ended Fiscal Year Ended May December 26, December 31, September 30, 1996 1997 1998 1999 1999 2000 2001 ------ ------ ------ -------- ------ ------ ------ Earnings: Income (loss) before income taxes 72.3 19.3 32.8 (119.2) 26.3 270.7 (39.2) Interest expense 0.0 11.2 56.5 72.3 56.5 81.3 76.4 Interest portion of rental expense 1.6 1.7 3.2 4.2 2.7 3.5 5.5 -------------------------------------------------------------------------------------- Total earnings: 73.9 32.2 92.5 (42.7) 85.5 355.5 42.7 -------------------------------------------------------------------------------------- Fixed Charges: Interest expense 0.0 11.2 56.5 72.3 56.5 81.3 76.4 Interest portion of rental expense 1.6 1.7 3.2 4.2 2.7 3.5 5.5 -------------------------------------------------------------------------------------- Total Fixed Charges 1.6 12.9 59.7 76.5 59.2 84.8 81.9 -------------------------------------------------------------------------------------- Ratio of earnings to fixed charges 46.2 2.5 1.5 (1) 1.4 0.2 0.5 (1) Earnings were inadequate to cover fixed charges by $119.2 million for Fiscal 1999