Use this semiconductor calculation for first-order device, material, fabrication, interconnect, packaging, or reliability estimates when every coefficient and unit convention is known.

Curvature radius (m)

Required number in m. Radius of curvature of the best-fit sphere over the wafer.

Wafer diameter (mm)

Required number in mm. Chord length across the wafer.

The cited overview of Wafer (electronics) supplies background for the terminology and domain context used by this tool.^[1]

Compute the sagitta bow of a wafer from its diameter and the radius of curvature of its free-form deformation. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Bow (µm)

Returned number in µm. Sagitta magnitude at the wafer center.

• Material composition, geometry, process history, temperature, electric field, bias, interfaces, parasitics, and fitted parameter ranges can invalidate a compact semiconductor model.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Compare the estimate with measured process data, current device documentation, and a higher-fidelity circuit, field, thermal, quantum, or TCAD model when the decision requires it.

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