SAN JOSE — The 90-day moving average orders at North American semiconductor equipment manufacturers was $1.48 billion in March, up 10.7% from the revised February numbers.

The three-month average of worldwide bookings was down 6.4% from March 2011.

Billings, meanwhile, fell 0.9% from February to $1.31 billion. Billings were down 20.9% from March 2011, but reached their highest level since July 2011.

The book-to-bill ratio rose 12 basis point sequentially to 1.13, SEMI said. A book-to-bill of 1.13 means that $113 worth of orders were received for every $100 of product billed for the month. It was the sixth straight month of growth and the highest mark since August 2010.

The SEMI book-to-bill is a ratio of three-month moving averages of worldwide bookings and billings for North American-based semiconductor equipment manufacturers. Billings and bookings figures are in millions of U.S. dollars.

Source: SEMI April 2012