PRAGUE, March 10 (Reuters) - U.S. chipmaker Onsemi

will lay off 170 staff in the Czech Republic, cutting its

workforce in the country by 7.5%, the company said on Monday,

saying it was adjusting to current market conditions.

The layoffs come while the firm plans a $2 billion expansion

of its Czech operations. It said it was still working with the

Czech government and the European Commission on filing public

aid requests, but did not give any further comment on how the

investment may be affected.