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

Bits per transfer (bit/transfer)

Optional number in bit/transfer. Payload bits represented by one transfer on one trace. Use 1 for a serial binary lane before encoding overhead.

Data rate per trace (GT/s)

Optional number in GT/s. Per-trace data rate. Must be greater than 0 GT/s.

Traces per millimeter (1/mm)

Optional number in 1/mm. Number of traces per millimeter of die edge. Must be greater than 0 /mm.

The cited overview of Integrated circuit packaging supplies background for the terminology and domain context used by this tool.^[1]

Estimate raw die-to-die bandwidth density from trace density, transfer rate, and bits carried per transfer. Bandwidth = traces/mm × GT/s/trace × bits/transfer ÷ 8000 in decimal TB/s/mm; encoding and protocol overhead are not deducted. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Bandwidth density (TB/s/mm)

Returned number in TB/s/mm. Raw aggregate byte-bandwidth density before line coding and protocol overhead.

• Material composition, geometry, process history, temperature, electric field, bias, interfaces, parasitics, and fitted parameter ranges can invalidate a compact semiconductor model.
• Bits per transfer must be at least 5e-324.
• Data rate per trace must be at least 5e-324.
• Traces per millimeter must be at least 5e-324.
• 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.

• Chiplet Latency Calculator

  Estimate point-to-point chiplet latency as propagation delay times distance divided by 1000 plus fixed interface overhead, total latency in ns where propagation is ps/mm.

• APB Energy Calculator

  Calculate the antiphase boundary (APB) energy per unit area (mJ/m²) from the per-atom APB energy (eV/atom) and the planar atomic density (1/nm²). Model: E = apbEnergyPerAtom × atomDensity × 160.2176634 mJ·m⁻²/(eV·nm⁻²); assumes an ideal planar APB with uniform density. Per-area result is not the total boundary energy (multiply by area for total energy). apbEnergyEvPerAtom must be ≥0 eV (0 yields 0 mJ/m²); atomDensityPerNm2 must be >0 1/nm². No relaxation, segregation, or temperature dependence is included.

• APD Multiplication Factor Calculator

  Compute the avalanche photodiode multiplication factor from the Miller model M=1/[1-(V/Vb)^N]. Inputs are magnitudes: reverse-bias magnitude V≥0 V must remain below breakdown magnitude Vb>0 V (numerator V, denominator Vb; V=0 gives M=1, V→Vb- diverges). Exponent N in [1, 6] (default 2) captures the ionization coefficients. Signed voltages are not supported (use magnitudes). Result M≥1 is a dimensionless factor (per-carrier gain, not total current).