Adds details from source about potential deal size in paragraphs 3-4

TOKYO, May 11 (Reuters) - Alphabet GOOGL.O, the parent company of Google, is considering selling Japanese yen bonds, according to a bookrunner's message seen by Reuters.

A deal could consist of a senior unsecured bond and would be subject to market conditions, the message said. It did not mention a potential deal size.

The issuance is expected to total several hundred billion yen, according to a source with direct knowledge of the deal who was not authorised to speak on the matter and declined to be identified.

Terms are expected to be decided this month, the source added.

Alphabet did not immediately respond to a Reuters request for comment.

A sale would mark Alphabet's first yen bond issue, according to LSEG data.

The world's largest technology companies are increasingly tapping debt markets to fund costly artificial intelligence ambitions, marking a shift from Silicon Valley's traditional reliance on cash for investments.

Big Tech is now expected to spend more than $700 billion on AI infrastructure this year, a sharp increase from $410 billion in 2025.

Alphabet has mandated Mizuho 8411.T, Bank of America BAC.N and Morgan Stanley MS.N to work on the potential transaction, the message said.

Morgan Stanley did not immediately respond to a request for comment. Bank of America and Mizuho declined to comment.

Alphabet last week raised almost $17 billion through two bond sales - a 9 billion euro ($10.6 billion) issue and a C$8.5 billion ($6.2 billion) issue, according to the company's filings.

In late April, it raised its annual capital spending forecast by $5 ‌billion to between $180 billion and $190 billion, and said it was planning another significant increase in 2027.

($1 = 1.3689 Canadian dollars)

($1 = 0.8508 euros)