Jeffrey Jones
Analyst · Stifel
Good afternoon, and welcome to our conference call to discuss Cohu's first quarter 2024 results and second quarter outlook. I'm joined today by our President and CEO, Luis Muller. If you need a copy of our earnings release, you may access it from our website at cohu.com or by contacting Cohu Investor Relations. There's also a slide presentation in conjunction with today's call that may be accessed on Cohu's website in the Investor Relations section.
Replays of this call will be available via the same page after the call concludes. Now to the safe harbor. During today's call, we will make forward-looking statements reflecting management's current expectations concerning Cohu's future business. These statements are based on current information that we have assessed but which, by its nature, is subject to rapid and even abrupt changes. We encourage you to review the forward-looking statements section of the slide presentation and the earnings release as well as Cohu's filings with the SEC including the most recently filed Form 10-K and Form 10-Q.
Our comments speak only as of today, May 2, 2024, and Cohu assumes no obligation to update these statements for developments occurring after this call. Finally, during this call, we will discuss certain non-GAAP financial measures. Please refer to our earnings release and slide presentation for reconciliations to the most comparable GAAP measures.
Now I'd like to turn the call over to Luis Muller, Cohu's President and CEO. Luis?
Luis Müller: Good afternoon. First quarter results were in line or better than guidance with non-GAAP gross margin of 46% and EPS of $0.01 as we navigate through the eye of the storm in this semiconductor cycle. We estimated test cell utilization at the end of first quarter, up 1 point to 72%. We expect business conditions to remain more or less at this level for another quarter or 2 before we start seeing improvement.
Test cell utilization at IDMs was down 1 point to 74% with computing, industrial and automotive demand down sequentially. OSAT utilization improved slightly to 70%, although still well below the trigger threshold for capacity buys at approximately 80%. There are a couple of bright spots in the quarter, a leading U.S. fabless semiconductor manufacturer has selected our Sense+ system with MicroSense for testing their next-generation, high-fidelity microphones.
This MicroSense microphone tester is Cohu's latest product in our MEMS solution portfolio. And when combined with the Sense+ automation platform, delivers state-of-the-art testing of up to 96 devices in parallel. According to industry analysts, the MEMS microphone sensor market is projected to grow 14.5% annually over the next 7 years, reaching an estimated revenue of $6.2 billion. We estimate a buy rate of approximately 1% for integrated test in vision inspection systems, making this an attractive market opportunity over the midterm.
In the optoelectronics market we saw increased demand for our testers, handlers and interface products for automotive LED production from a European customer. A leading automotive ADAS customer has selected Cohu's high-performance RF contactors for testing automotive radar sensors. Finally, we completed the qualification of Diamondx for final test of display driver ICs at a large customer in Korea, opening the door for the next stage of revenue growth in this important market that we started developing a few years ago.
This has been a fundamental strategy for a tester business to add a market segment in which Cohu can differentiate and diversify revenue. As the industry moves through its cycle, it remains critical to Cohu's strategy to leverage our profitable recurring business, which provides for a more stable revenue stream of mostly consumable products. Recurring was approximately 66% of revenue in the first quarter, serving an installed base of about 24,700 systems worldwide. Cohu's recurring business delivered revenue of $304 million over the last 12 months with a 3-year compound growth rate of 2.7%.
Finally, we published our 2023 sustainability report with improvements in many areas. Renewable source energy usage increased to 32%. We completed construction of a new modern facility in the Philippines with rainwater harvesting system and are investing solar energy installations at our factories in Malaysia and the Philippines. Cohu has also recently committed to engage with the science-based targets initiative, or SBTI with the goal to develop near-term science-based emissions reduction targets.
As the industry grows through this cycle, we remain focused on managing cash flow while continuing to execute critical new product developments and customer design win initiatives to enable growth when customers resume best capacity buys.
Let me now turn it over to Jeff to provide further details on first quarter results and second quarter 2024 guidance. Jeff?