Rambus Inc., known for patent battles against chip makers, is becoming one itself.

The Sunnyvale, Calif., company on Monday is announcing plans to sell chips under its own brand for the first time in its 25-year history. Rambus said the products, designed to boost the performance of server systems, are the latest step in a multiyear strategy to leave behind a business model linked to litigation.

"We have to be flexible," said Ronald Black, who has been pushing for changes since he was named Rambus's chief executive in 2012.

Rambus reported less than $300 million in revenue in 2014. But its legal tactics, and business model, have received outsize attention.

Rambus, founded in 1990, developed technologies to make memory chips work faster. Instead of selling chips itself, the company adopted the then-novel idea of building a business around licensing technology for chips sold by others.

When chip makers declined, Rambus sued them for patent infringement. The Federal Trade Commission entered the fray with antitrust charges in 2002, alleging that Rambus deceived an industry standard-setting group about its plans to enforce patents on technologies the group adopted. Rambus insisted it never violated the group's rules.

The FTC dropped its case in 2009 after adverse court rulings. Meanwhile, Rambus began making peace with most memory-chip makers. SK Hynix Inc., for example, in 2013 agreed to pay Rambus $240 million in patent royalties over five years, a deal extended in June by six years and $432 million.

Rambus also sought new sources of revenue, gradually reducing its near-total reliance on licensing patents and technology. In June 2011 it agreed to pay $342.5 million to buy Cryptography Research Inc., a San Francisco company specializing in security technology. It also started a lighting-related business based on LED technology.

Mr. Black said the latest move builds on Rambus's expertise in communications technology associated with memory. It developed a set of components that include data buffers, chips that are sometimes incorporated with memory chips on modules plugged into servers. Buffers hold data temporarily while it moves between other components, helping to minimize communication delays.

Rambus won't actually manufacture its new chips. Like most semiconductor companies founded since the 1980s, it will hire manufacturing specialists to make them.

It won't lack for competition. Companies such as Integrated Device Technology Inc. and Inphi Corp. already sell data buffers. Indeed, Mr. Black stressed that Rambus is abiding by standards set by the group associated with its original patent disputes to ensure its new chips are compatible with others' components.

Mario Morales, an analyst at research firm IDC, estimated that $250 million to $300 million worth of such chips are sold each year—a fraction of the nearly $50 billion market for the memory chips that data buffers complement.

But Patrick Moorhead, an analyst at Moor Insights & Strategy, said he expects the business to grow. He said new, faster memory chips exploit data buffers well and appeal to big Web services and other companies sifting through huge volumes of business data.

Mr. Black said computer makers and other customers wanted another credible supplier of the components. Though Rambus isn't likely to become a broad semiconductor supplier, he said, the new chip probably won't be the last.

"We will do this again," Mr. Black said.

The Rambus chips are now shipping to customers in sample volumes, with commercial production starting in late 2015, the company said.

Write to Don Clark at don.clark@wsj.com

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