Heat Sink Thermal Resistance 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

t4-290

Effect

Computation or source lookup only

Input and validation requirements

The specified output includes margin to Tj(max), but the specification provides no Tj(max) input or fixed value, making that output undefined. Additionally, sufficiently large finite JavaScript inputs overflow Tj to Infinity.

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": {
    "Ta": 25,
    "Ta_unit": "°C",
    "P": 10,
    "thetaJC": 1.2,
    "thetaCS": 0.3,
    "thetaSA": 4.5,
    "theta_unit": "°C/W",
    "Tj_max": 125,
    "Tj_max_unit": "°C"
  },
  "expected_outputs": {
    "Tj": 85,
    "Tj_unit": "°C",
    "margin_to_Tj_max": 40,
    "margin_unit": "°C"
  },
  "working": "θtotal = 1.2 + 0.3 + 4.5 = 6.0 °C/W. Temperature rise = 10 W × 6.0 °C/W = 60 °C. Tj = 25 °C + 60 °C = 85 °C. Margin = 125 °C − 85 °C = 40 °C."
}

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