PCB Via Current Capacity Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-222

Effect

Computation or source lookup only

Input and validation requirements

The model has an undefined real-valued result for negative delta_T, and the supplied specification omits the IPC constant selection, dimensional units, and any thermal-environment branch input. Consequently, identical numeric entries can produce materially different results or NaN unless the calculator validates and disambiguates them.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "via_diameter_mil": 20,
    "plating_thickness_mil": 1,
    "delta_T_C": 10,
    "via_count": 1
  },
  "expected_outputs": {
    "max_current_per_via_A": 1.378,
    "max_current_array_A": 1.378
  },
  "working": "A = π × t × (D + t) = 3.14159265 × 1 × (20 + 1) = 65.9734 mil². ΔT^0.44 = 10^0.44 = 2.75423. A^0.725 = 65.9734^0.725 ≈ 20.8469. I_via = 0.024 × 2.75423 × 20.8469 = 1.378 A. I_array = 1 × 1.378 = 1.378 A."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json