--Revisions temper optimistic comments from some industry executives in recent months

--TI lowers guidance for fourth straight quarter

--Both companies cite weakness in wireless demand

(Updates with additional guidance from TI starting in the first paragraph, fresh stock quotes)

Texas Instruments Inc. (TXN) and Altera Corp. (ALTR) on Thursday tempered their first-quarter outlooks, citing lower-than-expected sales to wireless customers.

The projections, which included lower profit and revenue estimates from Texas Instruments and a narrower sales view from Altera, offered a rebuttal to the upbeat tone struck by some industry executives who had tentatively called for the chip sector's trough in recent months.

For the current quarter, Texas Instruments now sees earnings between 15 cents and 19 cents a share, including at least 10 cents of restructuring and acquisition charges, with $2.99 billion to $3.11 billion in revenue. The company's conservative earnings forecast in January called for a profit between 16 cents and 24 cents a share, with $3.02 billion to $3.28 billion in revenue.

The company, which supplies electronics ranging from industrial machinery to videogame consoles, cut its profit and revenue forecasts three times last year due to weak demand in all of its end markets, though Chairman and Chief Executive Rich Templeton suggested as early as January that conditions for the company had hit their lowest.

In the current quarter, Texas Instruments pointed to lower demand for wireless products, a patch of the industry that often delivered the strongest growth in recent years.

The more cautious guidance comes after the chip maker's fourth-quarter profit fell on weaker sales and the company unveiled plans to close two older semiconductor-manufacturing plants in Japan and Texas over the next 18 months.

Altera, which makes programmable logic chips used in a range of electronics and industrial equipment, now expects revenue to fall 7% to 9% from the previous quarter, which would generate sales between $416.6 million and $425.8 million. Its downbeat view in January projected a sequential decline of 5% to 9%.

Semiconductor companies' results have weakened in recent quarters because of wilting demand, although some optimistic market observers have already started anticipating the end of the retrenchment.

Altera warned late last year that its outlook had deteriorated across all its major vertical markets, with conditions also weakening in every region except North America, where military sales were lifting its top line.

On Thursday, Altera said the timing of programs in the military market and weak demand from wireless customers forced it to temper the higher end of its sales view.

Texas Instruments shares slipped 1.3% to $32.18 after hours on the semiconductor company's weaker earnings revision, its fourth in as many quarters. The stock was off 9.1% over the past year through Thursday's close.

Altera shares were off fractionally at $37.20 after hours. The stock is off 14% over the past year.

-By Drew FitzGerald, Dow Jones Newswires; 212-416-2909; Andrew.FitzGerald@dowjones.com

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