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June 3 (Reuters) - Alphabet has increased the size of its equity offerings to $84.75 billion, in a sign ‌of strong investor appetite for big tech companies as ‌they expand their AI infrastructure and computing power.

On Monday, the Google parent ​said it would raise $80 billion, as big tech companies compete to out-build each other with AI data centers to get ahead in what executives see as a once-in-a-generation AI race.

In a ‌filing dated June ⁠2, Alphabet said it now aimed to raise $18 billion through the sale of Class A and ⁠C shares and $16.75 billion from depositary shares. It had earlier planned to raise $30 billion through concurrent public offerings backed by investment ​banks, ​split evenly between the two.

The ​company's plans to raise $10 billion ‌through a private placement of shares to Berkshire Hathaway and another $40 billion at-the-market offering program in the third quarter remain unchanged.

The stock offerings are set to finalize on June 4 with the depositary shares closing a day later, the ‌company said.

Alphabet raised its annual capital spending ​forecast by $5 billion to between $180 billion ​and $190 billion in April.

The ​world's largest tech companies are tapping debt ‌markets and raising equity to bolster ​AI infrastructure, ​marking a shift for Silicon Valley firms that typically relied on cash to fund their investments.

Tech giants' combined spending ​is now set ‌to exceed $700 billion this year, up from their ​prior expectations of about $600 billion.

(Reporting by Jaspreet Singh in ​Bengaluru; Editing by Leroy Leo)