4090 Wafer

The Electroglas 4090 is a wafer prober. The Electroglas 4090 is an Electroglas product. The model designation of the equipment is 4090.^{[1][2][3][4][5]}

A wafer prober holds a wafer on a movable chuck and aligns it with the test tooling using optical or pattern-recognition methods. The probe card carries an array of fine contacts that match the pad layout of the devices under test.

The chuck moves from die to die and brings the wafer into contact with the probe needles. A test head connected to the prober delivers electrical signals to the device, and the responses are measured to classify each die as passing or failing. The machine records the results for each die so that later processing steps can account for damaged or nonfunctional devices.

After probing, wafers move to back-end assembly operations such as dicing, die attach, and packaging. Electrical test results from probing help guide decisions about which die are suitable for assembly.

Wafer probers of this type are used in semiconductor manufacturing for wafer sort, die-level electrical testing, and yield management. The machines support process development and device characterization by collecting electrical data from each die on a wafer.

Applications include testing digital, analog, memory, and mixed-signal integrated circuits before packaging. Wafer-level probing also supports known-good-die qualification for multichip packaging and hybrid assembly.