4090 F

The Electroglas 4090 F belongs to the class of wafer probers used in semiconductor test operations. Such systems handle wafers, align them to a probing position, and present individual die or test structures to a probe card so electrical instruments can stimulate and measure the circuits or structures on the wafer.

A wafer prober generally transfers a wafer from a carrier to a chuck, secures it, and uses optical alignment to locate reference features on the wafer. The system then moves the wafer relative to a stationary probe card, or moves the probing assembly relative to the wafer, so that probe needles or contact elements touch the intended pads or bumps. During contact, external test electronics apply signals and record responses, while the prober manages stepping, alignment correction, and contact sequencing.

Wafer probing sits after front-end device fabrication and relevant wafer preparation steps, and before dicing and final package-level test. In the overall flow, machines of this class provide an early electrical checkpoint that helps identify nonconforming die, monitor process health, and collect information used to guide downstream handling and quality decisions.