FOX-XP Wafer-Level Burn-In and Test System

Aehr Test Systems is a Nasdaq-listed supplier of semiconductor test and burn-in equipment headquartered in Fremont, California. Its site cites more than 40 years of expertise and markets covering AI, automotive, silicon photonics, memory and silicon carbide. It addresses early-life failures that must be screened out before chips are sold or stacked in packages.

The FOX-XP burns in and tests up to nine 300 mm wafers at once before dicing and packaging, using FOX WaferPak full-wafer contactors and an optional automatic aligner. The same platform runs FOX DiePak carriers for singulated die and modules, up to 1,024 devices in parallel per carrier.

• Nine-wafer capacity: Burn-in and test of up to nine 300 mm wafers simultaneously.
• WaferPak contactors: Full-wafer contactors for wafers up to 300 mm.
• Auto aligner: FOX WaferPak Auto Aligner for automated high-volume operation.
• DiePak carriers: Singulated die and module test, up to nine carriers at a time.
• Product family: FOX-CP, FOX-NP and Sonoma for packaged parts and AI accelerators.
• Application range: AI processors, silicon photonics, GaN and silicon carbide power devices.

OSAT and test-service plants in Vietnam handling AI or power devices can add wafer-level burn-in to screen known-good-die before assembly.

Power-electronics and automotive chip makers can use it for GaN and silicon carbide reliability screening.

Screens early-life failures at wafer level, before known-good-die are committed to costly multi-die packages.

Tests up to nine 300 mm wafers in parallel for high-volume throughput.

One platform covers wafer, singulated die and packaged-part burn-in.

Automated aligner and contactor workflow supports production use.

AI processors and silicon photonics modules combine several costly dies in one package, so a single early failure wastes the whole assembly. This pushes burn-in and reliability screening earlier, to wafer and die level, a trend relevant to OSAT and test houses expanding in Vietnam and Southeast Asia.

Headquartered in Fremont, California (press release dateline); NASDAQ: AEHR. The Sonoma line came from the acquisition of Incal Technology. Press releases in 2026 report follow-on orders from an unnamed lead AI processor customer and silicon photonics customers.