** Teradyne TER.O shares falling 0.3% on Tues ahead of qtrly results after the bell, as investors look for reading on demand for its semiconductor testing equipment related to buildout of AI infrastructure

** Analysts expect qtrly rev up 1% to $743.8 mln, with adj EPS seen at $0.79 vs $0.90 yr-ago, per LSEG

** TER stock up about 17% YTD, trailing Nasdaq .IXIC gain of 23%

** Stock recently at 34x expected earnings, well above five-year avg forward PE of 25

(Reporting by Noel Randewich)

((noel.randewich@thomsonreuters.com))