Aehr Test Systems — AI supply-chain exposure

Aehr Test Systems makes wafer-level burn-in and test equipment — the machinery that stresses chips at high temperature and voltage before they ship, weeding out parts that would fail early in the field. Historically its base was silicon-carbide power devices, but it is extending the same wafer-level approach to AI processors, where reliability screening on expensive accelerators becomes more valuable.

Its place in the chain is a narrow, back-end supplier of test and burn-in capacity — a step that sits between fabrication and shipment. The model weights it lightly because it is a specialist tool vendor, not a bottleneck on the scale of memory or packaging. The exposure that matters is that as accelerators grow costlier and more numerous, the economic case for screening them before deployment strengthens, pulling demand toward wafer-level burn-in.