ST-Ericsson said restructuring "could impact some 1,600 employees", out of which 500-700 were in Europe, including 400 to 600 positions in Sweden and 50 to 80 positions in Germany.
Ericsson will book a 500 million kronor (59.9 million euros, $77.8 million) restructuring charge in the fourth quarter this year, after announcing an eight billion kronor write-off for ST-Ericsson in the fourth quarter of 2012.
STMicroelectronics expected to incur a $350-$450 million (between 270 million and 347 million euros) cost this year for the split.
ST-Ericsson last year had a headcount of 5,000, mostly in Sweden, Germany, India and China.
The Swedish company will take over 1,800 staff, leaving the Franco-Italian company with a workforce of 950 for remaining activities.
The maker of mobile platforms and semiconductors has never been profitable since being founded in early 2009. In the fourth quarter of last year, it made a net loss of $133 million.
Carlo Ferro will replace Didier Lamouche as chief executive to oversee the unwinding of the venture, the company said.
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