Documentation sections

Heatsink Calculator

POSThttps://rftools.io/api/py/v1/calculate

Slug heatsink-calculator. Calculate required heatsink thermal resistance (θ_SA) and junction temperature for MOSFETs, IGBTs, and power ICs. Verify thermal design feasibility. Free results.

Inputs

Send every one of these in inputs, in the units shown. Most are required: a call without one is refused (400) and costs nothing; one the calculator can do without takes the default shown. An input outside its range is still computed and flagged in the provenance.

Inputs of heatsink-calculator
Name	Unit	Range	Default	Description
powerDissipationnumber	W	at least 0	5	Power Dissipation
maxJunctionTempnumber	°C	25 … 200	125	Max Junction Temperature
ambientTempnumber	°C	−40 … 85	25	Ambient Temperature
thetaJCnumber	°C/W	at least 0.1	2	Junction-to-case thermal resistance from datasheet
thetaCSnumber	°C/W	at least 0	0.5	Case-to-heatsink thermal resistance (thermal pad/grease)
numLayersnumber	none	0 … 6	0	Thermal layers in series between the case and the heatsink besides θ_CS, such as an insulating pad, a spreader or a board with thermal vias (0–6)
layer1Thetanumber	°C/W	0 … 100	1	Thermal resistance of extra layer 1, in series between the case and the heatsink
layer2Thetanumber	°C/W	0 … 100	1	Thermal resistance of extra layer 2, in series between the case and the heatsink
layer3Thetanumber	°C/W	0 … 100	1	Thermal resistance of extra layer 3, in series between the case and the heatsink
layer4Thetanumber	°C/W	0 … 100	1	Thermal resistance of extra layer 4, in series between the case and the heatsink
layer5Thetanumber	°C/W	0 … 100	1	Thermal resistance of extra layer 5, in series between the case and the heatsink
layer6Thetanumber	°C/W	0 … 100	1	Thermal resistance of extra layer 6, in series between the case and the heatsink

Outputs

Returned in values, by key. A value that is unbounded or undefined is null.

Outputs of heatsink-calculator
Field	Unit	Description
thetaSA_requiredheadline	°C/W	Required heatsink-to-ambient thermal resistance — lower is better
junctionTemp	°C	Junction Temperature
thetaJA_total	°C/W	Total θ_JA
tempRise	°C	Temperature Rise
thetaJS	°C/W	The stack between the junction and the heatsink: θ_JC + θ_CS + the extra layers
heatsinkTemp	°C	Temperature of the heatsink where the device mounts: T_J − P_D·θ_JS

Calling it

Calculate: one call, the request and response in full, and its errors.
Batch: this calculator with others, or a sweep, in one request.
Solve for a target: the value of one input that brings an output to a target.

curl -X POST https://rftools.io/api/py/v1/calculate \
  -H "X-API-Key: $RFTOOLS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "slug": "heatsink-calculator",
    "inputs": {
      "powerDissipation": 5,
      "maxJunctionTemp": 125,
      "ambientTemp": 25,
      "thetaJC": 2,
      "thetaCS": 0.5,
      "numLayers": 0,
      "layer1Theta": 1,
      "layer2Theta": 1,
      "layer3Theta": 1,
      "layer4Theta": 1,
      "layer5Theta": 1,
      "layer6Theta": 1
    }
  }'

import rftools

client = rftools.Client()  # reads RFTOOLS_API_KEY, or the key `rftools login` saved

result = client.calculate("heatsink-calculator", {
    "powerDissipation": 5,
    "maxJunctionTemp": 125,
    "ambientTemp": 25,
    "thetaJC": 2,
    "thetaCS": 0.5,
    "numLayers": 0,
    "layer1Theta": 1,
    "layer2Theta": 1,
    "layer3Theta": 1,
    "layer4Theta": 1,
    "layer5Theta": 1,
    "layer6Theta": 1,
})
print(result.values)
print(result.warnings, result.provenance.formula_ref)

const response = await fetch("https://rftools.io/api/py/v1/calculate", {
  method: "POST",
  headers: {
    "X-API-Key": process.env.RFTOOLS_API_KEY,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "slug": "heatsink-calculator",
    "inputs": {
      "powerDissipation": 5,
      "maxJunctionTemp": 125,
      "ambientTemp": 25,
      "thetaJC": 2,
      "thetaCS": 0.5,
      "numLayers": 0,
      "layer1Theta": 1,
      "layer2Theta": 1,
      "layer3Theta": 1,
      "layer4Theta": 1,
      "layer5Theta": 1,
      "layer6Theta": 1
    }
  }),
});
console.log(response.status, await response.json());

package main

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
	"os"
)

func main() {
	body := []byte(`{
	  "slug": "heatsink-calculator",
	  "inputs": {
	    "powerDissipation": 5,
	    "maxJunctionTemp": 125,
	    "ambientTemp": 25,
	    "thetaJC": 2,
	    "thetaCS": 0.5,
	    "numLayers": 0,
	    "layer1Theta": 1,
	    "layer2Theta": 1,
	    "layer3Theta": 1,
	    "layer4Theta": 1,
	    "layer5Theta": 1,
	    "layer6Theta": 1
	  }
	}`)
	req, err := http.NewRequest("POST", "https://rftools.io/api/py/v1/calculate", bytes.NewReader(body))
	if err != nil {
		panic(err)
	}
	req.Header.Set("X-API-Key", os.Getenv("RFTOOLS_API_KEY"))
	req.Header.Set("Content-Type", "application/json")
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	out, _ := io.ReadAll(res.Body)
	fmt.Println(res.Status, string(out))
}

application/json

{
  "slug": "heatsink-calculator",
  "values": {
    "thetaSA_required": 17.5,
    "junctionTemp": 125,
    "thetaJA_total": 20,
    "tempRise": 100,
    "thetaJS": 2.5,
    "heatsinkTemp": 112.5
  },
  "warnings": [],
  "errors": [],
  "provenance": {
    "method": "calculator:heatsink-calculator",
    "version": "api@3f2c1a9b04de",
    "formulaRef": "JEDEC JESD51 thermal measurement standard",
    "assumptions": [],
    "validRange": {
      "status": "inside",
      "bounds": {
        "powerDissipation": {
          "min": 0,
          "max": null,
          "unit": "W"
        },
        "maxJunctionTemp": {
          "min": 25,
          "max": 200,
          "unit": "°C"
        },
        "ambientTemp": {
          "min": -40,
          "max": 85,
          "unit": "°C"
        },
        "thetaJC": {
          "min": 0.1,
          "max": null,
          "unit": "°C/W"
        },
        "thetaCS": {
          "min": 0,
          "max": null,
          "unit": "°C/W"
        },
        "numLayers": {
          "min": 0,
          "max": 6,
          "unit": ""
        },
        "layer1Theta": {
          "min": 0,
          "max": 100,
          "unit": "°C/W"
        },
        "layer2Theta": {
          "min": 0,
          "max": 100,
          "unit": "°C/W"
        },
        "layer3Theta": {
          "min": 0,
          "max": 100,
          "unit": "°C/W"
        },
        "layer4Theta": {
          "min": 0,
          "max": 100,
          "unit": "°C/W"
        },
        "layer5Theta": {
          "min": 0,
          "max": 100,
          "unit": "°C/W"
        },
        "layer6Theta": {
          "min": 0,
          "max": 100,
          "unit": "°C/W"
        }
      },
      "outside": [],
      "model": null
    },
    "computedAt": "2026-09-24T14:05:11.003Z",
    "inputs": {
      "powerDissipation": 5,
      "maxJunctionTemp": 125,
      "ambientTemp": 25,
      "thetaJC": 2,
      "thetaCS": 0.5,
      "numLayers": 0,
      "layer1Theta": 1,
      "layer2Theta": 1,
      "layer3Theta": 1,
      "layer4Theta": 1,
      "layer5Theta": 1,
      "layer6Theta": 1
    },
    "seed": null,
    "elapsedSeconds": 0.003
  }
}

{
  "detail": [
    {
      "type": "float_parsing",
      "loc": [
        "body",
        "inputs",
        "powerDissipation"
      ],
      "msg": "Input should be a valid number, unable to parse string as a number",
      "input": "abc"
    }
  ]
}

An input sent as text. Nothing was counted.

{
  "detail": "More than 120 requests in 60 seconds from this address.",
  "errorKind": "rate_limited",
  "limit": 120,
  "windowSeconds": 60,
  "upgradeUrl": "https://rftools.io/pricing/"
}

Too many requests in a minute, with Retry-After.

Same inputs on the calculator pageHeatsink Calculator, at these values