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Semiconductor industry revenue will grow at a slow pace this year due to struggling economies worldwide, lower spending and sluggish demand for products, research firm said in a study released on Tuesday.

Revenue for the semiconductor industry this year is expected to be US$323 billion, growing by just 3.3 percent compared to last year's revenue, research firm said.

"Because the world economy is not in a strong-enough position to drive growth, the semiconductor business is coming under pressure," said research firm, in a statement.

The weak performance of the semiconductor market has continued from last year, and there are economic troubles in the U.S., Europe, Japan and China, research firm said. Semiconductors are used in a range of products including PCs, smartphones, tablets, cars and medical devices. With consumers spending less, semiconductor demand will decrease and hurt revenue, research firm said.

Manufacturers will try to clear out semiconductor inventory and keep existing factories viable,research firm said. Any capital expenditure to boost production or upgrade factories will likely be pushed into 2013.

The weak demand for some products also will hurt demand for DRAM, research firm said. Revenue for the memory is expected to decline by 16.1 percent this year, which is slightly better than the 26.8 percent fall last year.

A shortfall in the PC market has hurt memory demand, which has softened DDR3 RAM pricing this year. As PC prices remain under pressure, PC makers have been resistant to adding more RAM, which has led memory makers to move excess memory inventory to market rapidly. Some top DRAM makers like Samsung have also been suffering from yield and supply issues.

The pricing environment for DRAM is the primary driver for the expected year-over-year revenue drop in DRAM, said Mike Howard, senior principal analyst at iSuppli. Shipments of DRAM will be up around 40 percent this year on a gigabit basis, but in a very soft pricing environment.

"There is one huge wild card in DRAM right now and that is industry consolidation," Howard said. Mergers of DRAM makers are likely, which could improve the 2012 pricing environment.

The market for NAND flash is "less rosy" despite the surging demand for devices like smartphones and tablets,research firm said. There is growing demand for NAND flash as storage requirements grow on mobile devices, but additional factory capacity to meet excess demand could lead to oversupply and likely pressure NAND flash revenue.

NAND flash prices have also been tumbling since 2010, and stood at $12.90 on Tuesday afternoon for a 64GB unit, according to memory-price-tracking site DRAMexchange.

"Despite robust demand coming from the mobile segment, we are forecasting NAND revenue growth of only 5 percent in 2012 to reflect the risk of oversupply currently plaguing the industry," research firm said .

Three new fabs came online last year and are expected to be fully operational this year. That could drive up industry supply growth up to 69 percent year over year, outstripping demand growth, Nguyen said. That in turn could weaken the pricing environment, with average selling prices declining 39 percent year over year, compared to 30 percent in 2011.