Intel Corp.'s chief executive largely took incremental steps in his first two years atop the chip giant to reduce its long-standing reliance on the personal-computer market. Now, Brian Krzanich is stepping out on a limb.

The $16.7 billion deal that Mr. Krzanich disclosed on Monday to buy programmable chip maker Altera Corp. is the costliest in the Santa Clara, Calif., company's 47-year history. Some Wall Street analysts question whether Intel paid too much.

Even Mr. Krzanich characterized the price as startling. "There is a bit of surrealness to it," he said in an interview on Monday. "The number is so big."

But Mr. Krzanich, a 55-year-old manufacturing veteran who became Intel's sixth CEO in 2013, believes Altera's technology will pay off by expanding Intel's most lucrative business—chips for corporate-data centers—and by allowing it to better exploit a nascent market known as the Internet of Things.

Its offer would deliver $54 a share to Altera holders, about 56% higher than when The Wall Street Journal first reported deal talks between the companies in March. It continues a wave of consolidation in the chip industry, which includes Thursday's $37 billion bid for Broadcom Corp. by Avago Technologies Ltd.

Intel has a big reason to follow suit. Demand for its microprocessors used in PCs, the technical foundation of Intel's business since the early 1980s, has slowed as spending shifted to products like smartphones and tablets. After a slight rebound in PC spending last year, Intel said in April that revenue from the group that includes PC chips fell 8%.

Intel has carved out a foothold in smartphone chips after years of effort, working to crack a market where chip designs licensed by ARM Holdings PLC are the norm. And under Mr. Krzanich it has managed to build a large position in tablets, with the aid of costly subsidies, but a comparable share in smartphone chips seems unlikely soon.

Smartphones are "not one of the areas that is likely to be a growth engine for the company," Mr. Krzanich said.

Mr. Krzanich is a self-described tinkerer who sometimes appears at hobbyist events where nonprofessionals show off electronic devices they build. He has promoted the use of Intel chips for such gadgets, while pushing the company into markets for smartwatches and other wearable technology.

Altera, along with San Jose, Calif.-based Xilinx Inc., specializes in chips called field programmable gate arrays that can be customized for specific jobs after they leave the factory. They are particularly popular in networking and wireless equipment, which would represent new markets for Intel. Some companies have also been using FPGAs alongside conventional chips to help speed up servers, a concept that is among Intel's motivations for the deal.

Another motivation has to do with the steep costs required to stay on the relentless, two-year cadence of semiconductor miniaturization dubbed Moore's Law, after an Intel co-founder.

Intel already makes some chips that Altera designs under a prior partnership. Mr. Krzanich said Altera could benefit from more of Intel's manufacturing prowess in the future, getting access sooner than other FPGA makers to new production recipes that could help squeeze more features on chips.

Altera already is quite profitable. Its gross margin, or profit after production cost, stood at 64% of sales in the first quarter, where Intel reported a smaller, 60.5% margin for the period.

But growth is a question. Altera reported that its sales declined 6% in the first period. And with 2014 revenues of just $1.9 billion—compared with $55.9 billion for Intel—some analysts question whether the Altera acquisition can provide the sizable revenue bump Intel seeks.

"Growth targets appear wildly optimistic," wrote Stacy Rasgon, an analyst at Sanford C. Bernstein, in a research note after Intel announced it was buying Altera for about $16.7 billion. "It appears challenging to justify the price paid for the asset."

But Intel executives said they expect the FPGA market to expand about 7% a year, and expect Altera to add to Intel's per-share earnings in the first year after the deal closes.

Intel initially plans to begin selling Intel Xeon chips in units that also contain Altera FPGAs, a combination that can have advantages over buying the two kinds of chips separately. Those products should arrive in late 2016 and be widely available the next year.

But the biggest advantages, Mr. Krzanich said, come when the two kinds of design are placed on one piece of silicon. Faster communications among the circuitry on such integrated products roughly doubled the performance compared with separate chips, he said.

Server vendors are expected to be the first target for such combinations. But Mr. Krzanich also planned to combine Intel's low-cost Atom processor chips with Altera circuitry for applications that fall under the Internet of Things, a broad term for adding processing and communications capability to many kinds of everyday items purchased by consumers and businesses.

Mr. Krzanich said Intel wouldn't target the kind of low-price chips that go into products like so-called smart light bulbs and doorknobs. Rather, he expected to target applications where beefier Intel chips could be combined with specialized instructions programmed into Altera's circuitry.

One example might be chips for robots that need vision capabilities to move around their environment, Mr. Krzanich said. If specialized vision algorithms were incorporated into FPGAs, he said, "the robot could be twice as fast, twice as capable and lower cost."

Other examples could be drones that fly independently for purposes such as delivering packages, or advanced automotive driver-assistance systems, Mr. Krzanich said.

One reason customers are excited about FPGA technology, he added, is that instructions programmed into such chips can be updated as technology or market conditions demand—an advantage over chips designed to do one kind of job.

Altera will become a new operating division of Intel, Mr. Krzanich said, with substantial cost savings expected as duplicate general and administrative functions and workers are eliminated. A future role for John Daane, Altera's chief executive, hasn't been disclosed.

The deal, which is subject to regulatory approval, is expected to close within six to nine months, Intel said.

Intel's shares fell 1.6% to $33.90 while Altera's shares rose 5.8% to $51.68, both in 4 p.m. Nasdaq trading on Monday.

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

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