Analysts are expecting similar or lower profits in the second quarter, a result of slower growth in DRAM chip prices and increased marketing costs for the Galaxy S9 handsets.
Samsung Electronics yet again broke its quarterly profit record on the back of red-hot semiconductor sales and the Galaxy S9 smartphone's launch last month.
Total revenue are projected at ₩60 trillion ($56 billion), adding 18.7 percent from ₩50.55 trillion in the same quarter past year.
Samsung's announced operating profit was 1 trillion won more than the market's consensus.
Samsung's sales boost comes as its rival Apple has been struggling to sell its flagship iPhone X, and Chinese competitors like Huawei have not released any major new models recently.
Still, some grew concerned that Apple Inc.'s iPhone X may be affecting the sales momentum of the Galaxy S9.
Samsung's guidance report did not give specific details about the performance of the four divisions of the company - semiconductors, display, consumer electronics and IT and mobile communications.
Analysts said Samsung's shares were affected by a UBS report forecasting an increase in the supply of DRAM chips used in servers, which dragged down Micron Technology shares more than 6 per cent on Thursday. Stock price of the chipmaker was still down by 3.6 percent to $48.00 in pre-market trading.
Despite the falling shares and slowing memory chip prices, Samsung is still expected to reach record annual earnings in 2018.
The prices of NAND chips commonly used in mobile devices began falling late previous year and analysts have been closely watching for signs of the peak in the DRAM price boom as well.
"Although gains in memory chip prices have slowed from the height of the chip boom, lower prices could also increase demand for chips, and Samsung has the cost-cutting ability to keep profits up", said Greg Roh, an analyst at HMC Investment & Securities. Semiconductors play a vital role for the Korean tech company, and a year ago they accounted for 65.6 percent of the company's overall operating profit.