Aehr Test Systems ($AEHR) earnings deep dive: the $100.6M backlog, 3x fiscal 2027 revenue guide, FOX-XP and Sonoma burn-in systems, unnamed AI customers, revenue upside, and bull/bear risks.
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$AEHR makes semiconductor reliability test and burn-in equipment. Its FOX-XP systems stress and test entire wafers before chips are packaged; its proprietary WaferPak contactors connect the tester to a specific wafer design; and its Sonoma systems burn in high-power packaged AI processors. The equipment is used for AI chips, silicon photonics, silicon carbide and gallium nitride power devices, memory, and other high-reliability semiconductors.
$AEHR does not disclose their names. In fiscal Q4 2026, three customers each represented more than 10% of revenue: two targeted AI and one supplied data-center optical transceivers. The largest disclosed program is a $41 million Sonoma order from an unnamed hyperscale data-center customer for custom AI processors.
Management guided to $130–150 million, up 160%–200% from fiscal 2026. Effective backlog was $100.6 million after the quarter, covering 67%–77% of that range. The guide assumes roughly 70% AI revenue, 15%–20% silicon photonics, and no memory revenue.
$AEHR was profitable in fiscal Q4, with $1.4 million of GAAP net income and $3.6 million of non-GAAP net income. It still lost $7.1 million on a GAAP basis for the full fiscal year. For fiscal 2027, management targets non-GAAP pretax income equal to 18%–22% of revenue.
AI processors are large, power-dense, and increasingly assembled from multiple compute and memory dies. A failure found after packaging can destroy the value of every good component in the package. Wafer-level burn-in screens weak dies earlier, while package-level systems stress finished processors before deployment in expensive data-center infrastructure.