The cash-and-stock offer values SanDisk at $86.50 per share, or a total equity value of about $19 billion, using a five-day volume weighted average price ending on Oct. 20 of $79.60 per share of Western Digital stock.
SanDisk's shares rose 6.4 per cent to $80 in pre-market trading. Western Digital's shares were down 1.1 per cent at $74.
Google invests in Chinese artificial intelligence firm
Demand for cheaper chips and new products to power Internet-connected gadgets, as well as a push from technology companies to consolidate suppliers, has led to record levels of deal making in the semiconductor sector this year.
The value of the SanDisk acquisition will depend on the closing and approval of an investment from a unit of China's state-backed Tsinghua Holdings Co Ltd, Unisplendour Corp Ltd in Western Digital, the companies said on Wednesday.
The deal is expected to close in the third calendar quarter of 2016.
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