UPDATE 1-Soitec sees Q1 sales up at least 20 pct vs Q4

* Sees sequential sales growth of over 20 pct in Q1

* No sales prediction for full year ending March 2010

(Adds further details)

PARIS, June 22 (Reuters) - French silicon group Soitec (SOIT.PA) said on Monday it expected first-quarter sales to grow by more than 20 percent from the fourth quarter of the previous year but prospects were too unclear to make a prediction for the full year ending March 2010.

Soitec, which supplies silicon-on-insulator wafers to companies such as IBM (IBM.N), said it had received "urgent orders" from its main clients, who were "significantly" adjusting upwards their demand for the first six months of the current fiscal year, which ends on March 31, 2010.

Soitec also said that early indications for the second quarter were of a sustained level of activity "with a possible new sequential growth which must be confirmed in coming months"

"Due to overall uncertainty on a lasting improvement in final demand during the second half, the group repeats it cannot make a sales prediction for the full 2009-10 year," it said.

Soitec reports first quarter sales on July 20. (Reporting by Dominique Vidalon)