TSMC Monthly Sales Report - March 2005

Hsinchu, Taiwan, R.O.C. – April 7, 2005 -- Taiwan Semiconductor Manufacturing Company Ltd. (TSMC) (TAIEX: 2330, NYSE: TSM) today announced that net sales for March 2005 totaled NT$17,610 million, and that revenues for January through March 2005 were NT$55,653 million.

Ms. Lora Ho, TSMC vice president and chief financial officer, noted that, “Due to higher wafer shipments, net sales for March 2005 increased by 2.4 percent compared to February 2005. On a year-over-year basis, net sales for March 2005 decreased 11.8 percent.”

Our first quarter 2005 guidance, which was announced on January 27, is as follows:

Wafer shipments to decrease by a single digit percentage point sequentially;

Overall utilization rate to be about 78%;

Gross profit margin to be in the range of 38% to 40%;

ASP to remain about the same sequentially.

“Our first quarter 2005 results are in line with the above guidance,” Ms. Lora Ho added.

Sales Report: (Unit: NT$ million)

Net Sales

2005(1)

2004

Increase (Decrease) %

March

17,610

19,972

(11.8)

January through March

55,653

57,513

(3.2)

(1): Year 2005 figures have not been audited.