Foundry chipmaker Taiwan Semiconductor Manufacturing Company (TSMC) saw its sales decrease sequentially in November 2011, joining fellow company United Microelectronics Corporation (UMC), which also experienced an on-month decrease in revenues in October.

TSMC posted consolidated revenues of NT$35.86 billion (US$1.19 billion) for November 2011, down 4.7% on month and down 2.7% on year. Consolidated sales for January through November totaled NT$395.84 billion, rising 2.9% from a year ago.

The sales result was released on the heels of announcements made by Altera and Texas Instruments, who are among TSMC's major clients, about their downward revisions to the fourth quarter.

Vanguard International Semiconductor (VIS), a foundry affiliate of TSMC specializing in LCD driver ICs and other analog/mixed-signal chips, has reported November revenues grew about 23% sequentially to NT$1.24 billion. Company spokesperson DL Tseng credited the positive result to higher wafer shipments.

VIS accumulated NT$14.78 billion in sales from January through November, a 4% decline from 2010.