Secciones de la documentación

Calculadora de Temperatura de Pista PCB

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

Slug pcb-trace-temp. Calcula la elevación de temperatura en pistas de cobre de PCB por efecto Joule a alta corriente.

Entradas

Envíe cada una de estas en inputs, en las unidades indicadas. La mayoría son obligatorias: una llamada a la que le falte una se rechaza (400) y no cuesta nada; una de la que la calculadora puede prescindir toma el valor predeterminado indicado. Una entrada fuera de su rango se calcula igualmente y se marca en la procedencia.

Entradas de pcb-trace-temp
Nombre	Unidad	Rango	Valor predeterminado	Descripción
currentnúmero	A	al menos 0	3	Corriente
traceWidthnúmero	mm	al menos 0.1	2	Ancho de traza
copperWeightnúmero	oz	al menos 0.5	1	Peso del cobre
ambientTempnúmero	°C	cualquiera	25	Temperatura ambiente
traceLengthnúmero	mm	al menos 1	100	Longitud de traza
boardThicknessnúmero	mm	0.2 … 6	1.6	El espesor de toda la placa. Solo lo usa el aumento para esta placa (modelo térmico de rftools); el modelo está validado de 1,4 a 3,2 mm
planeDistancenúmero	mm	0 … 6	0	El dieléctrico entre la traza y el plano de cobre continuo más cercano por debajo; 0 significa sin plano. Solo lo usa el aumento para esta placa
planeCopperWeightnúmero	oz	0.5 … 2	0.5	El peso del cobre de ese plano (35 µm por onza). Solo lo usa el aumento para esta placa, y solo cuando hay un plano
isExternalnúmero	ninguna	0 … 1	1	Solo cambia el aumento específico de esta placa; el aumento de IPC-2221 es siempre el de la gráfica A, externa, y la figura 5-1 es la misma en cualquier capaUno de: 1 Capa externa (exterior) · 0 Capa interna
laminatenúmero	ninguna	0 … 3	0	El laminado y el grosor dieléctrico total de la placa, que establecen su temperatura máxima de funcionamientoUno de: 0 FR-4, ≥ 0,4 mm · 1 FR-4, 0,1–0,4 mm · 2 Poliimida, ≥ 1,6 mm · 3 Poliimida, 0,1–1,6 mm
standardnúmero	ninguna	0 … 1	0	La gráfica en la que se lee el incremento: la curva externa de IPC-2221A, como Incremento de temperatura, o la gráfica conservadora de IPC-2152. En ambos casos, el límite es la temperatura máxima de funcionamiento del laminado menos la temperatura ambiente.Uno de: 0 IPC-2221A Fig. 6-4 · 1 IPC-2152 Fig. 5-1

Salidas

Se devuelven en values, por nombre. Un valor ilimitado o no definido es null.

Salidas de pcb-trace-temp
Campo	Unidad	Descripción
tempRiseprincipal	°C	Aumento de temperatura (IPC-2221)
maxTemp	°C	Temperatura máxima de la traza (IPC-2221)
traceResistance	mΩ	Resistencia de la traza
powerDissipated	mW	Potencia disipada
currentCapacity	A	Capacidad de corriente (IPC-2221, ΔT = 10 °C)
tempRise2152	°C	Aumento de temperatura (IPC-2152 Fig. 5-1)
maxTemp2152	°C	Temperatura máxima de la traza (IPC-2152 Fig. 5-1)
inChartRange	ninguna	Dentro del rango de IPC-2152 Fig. 5-1
tempRiseBoard	°C	Aumento de temperatura (esta placa, modelo térmico)
maxTempBoard	°C	Temperatura máxima de la traza (esta placa, modelo térmico)
inModelRange	ninguna	Dentro del rango del modelo térmico
chartRise	°C	Incremento de temperatura según la gráfica
limitRise	°C	Incremento permitido
limitPercent	%	Porcentaje del límite
minTraceWidth	mm	Ancho conforme
maxCurrent	A	Corriente conforme

Cómo llamarla

Calcular: una llamada, la solicitud y la respuesta completas, y sus errores.
Cálculo por lotes: esta calculadora con otras, o un barrido, en una sola solicitud.
Resolver para un valor objetivo: el valor de una entrada que lleva una salida a un objetivo.

curl -X POST https://rftools.io/api/py/v1/calculate \
  -H "X-API-Key: $RFTOOLS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "slug": "pcb-trace-temp",
    "inputs": {
      "current": 3,
      "traceWidth": 2,
      "copperWeight": 1,
      "ambientTemp": 25,
      "traceLength": 100,
      "boardThickness": 1.6,
      "planeDistance": 0,
      "planeCopperWeight": 0.5,
      "isExternal": 1,
      "laminate": 0,
      "standard": 0
    }
  }'

import rftools

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

result = client.calculate("pcb-trace-temp", {
    "current": 3,
    "traceWidth": 2,
    "copperWeight": 1,
    "ambientTemp": 25,
    "traceLength": 100,
    "boardThickness": 1.6,
    "planeDistance": 0,
    "planeCopperWeight": 0.5,
    "isExternal": 1,
    "laminate": 0,
    "standard": 0,
})
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": "pcb-trace-temp",
    "inputs": {
      "current": 3,
      "traceWidth": 2,
      "copperWeight": 1,
      "ambientTemp": 25,
      "traceLength": 100,
      "boardThickness": 1.6,
      "planeDistance": 0,
      "planeCopperWeight": 0.5,
      "isExternal": 1,
      "laminate": 0,
      "standard": 0
    }
  }),
});
console.log(response.status, await response.json());

package main

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

func main() {
	body := []byte(`{
	  "slug": "pcb-trace-temp",
	  "inputs": {
	    "current": 3,
	    "traceWidth": 2,
	    "copperWeight": 1,
	    "ambientTemp": 25,
	    "traceLength": 100,
	    "boardThickness": 1.6,
	    "planeDistance": 0,
	    "planeCopperWeight": 0.5,
	    "isExternal": 1,
	    "laminate": 0,
	    "standard": 0
	  }
	}`)
	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": "pcb-trace-temp",
  "values": {
    "tempRise": 5.342104787621994,
    "maxTemp": 30.342104787621995,
    "traceResistance": 24.63054187192118,
    "powerDissipated": 221.67487684729062,
    "currentCapacity": 3.953008949362809,
    "chartRise": 5.342104787621994,
    "limitRise": 105,
    "limitPercent": 5.0877188453542805,
    "minTraceWidth": 0.3281129167384957,
    "maxCurrent": 11.12374665416563,
    "tempRise2152": 25.814961619314374,
    "maxTemp2152": 50.814961619314374,
    "inChartRange": 1,
    "tempRiseBoard": 10.281805774783722,
    "maxTempBoard": 35.28180577478372,
    "inModelRange": 1
  },
  "warnings": [],
  "errors": [],
  "provenance": {
    "method": "calculator:pcb-trace-temp",
    "version": "api@3f2c1a9b04de",
    "formulaRef": "IPC-2221A (May 2003) §6.2, Figure 6-4, chart A (the chart of IPC-2221, February 1998), through its published fit; IPC-2152 (August 2009) §5, Figure 5-1; the board-specific rise: rftools thermal model (board-specific), fitted to its own 2-D solver and checked against Brooks & Adam (2015), Jouppi (2010) and Olson (2010)",
    "assumptions": [
      {
        "code": "ipc-2221-external-fit",
        "text": "The IPC-2221 rise is IPC-2221 Figure 6-4 chart A, the external-layer chart, through its published fit with k = 0.048; chart A draws 10 to 100 °C up to 700 sq mil, and the internal-layer chart is not applied to this rise."
      },
      {
        "code": "ipc-2152-figure-5-1",
        "text": "The IPC-2152 rise is read on IPC-2152 Figure 5-1, the chart IPC-2152 recommends for internal and external conductors in all environments, through the same fit with k = 0.024 on either layer; IPC-2152’s corrections for board thickness and a nearby copper plane are not applied."
      },
      {
        "code": "copper-weight",
        "text": "Copper is 35 µm thick per ounce, and the trace cross-section is a rectangle of that thickness."
      },
      {
        "code": "resistance-at-20c",
        "text": "The trace resistance and power use ρ = 1/58 Ω·mm²/m (IEC 60028, 1.7241×10⁻⁸ Ω·m) at 20 °C, not corrected for the trace’s temperature."
      },
      {
        "code": "thermal-model-own-method",
        "text": "The board-specific rise is the rftools thermal model (board-specific): the site's own steady-state model of a long trace on an FR-4 board in still air, with an optional copper plane under it. It is not IPC-2152 and does not read IPC-2152's charts; it is a closed form fitted to a committed 2-D solver, which is checked against published results (Brooks & Adam 2015; Jouppi 2010; Olson 2010)."
      },
      {
        "code": "thermal-model-fr4",
        "text": "The laminate is FR-4, conducting 0.8 W/(m·K) in the plane of the board and 0.3 W/(m·K) through it (Graebner 1995; Azar & Graebner 1996). A laminate that conducts less runs hotter."
      },
      {
        "code": "thermal-model-still-air",
        "text": "The board is horizontal, in still air at sea level. Its faces lose heat by natural convection (the McAdams horizontal-plate correlations, over the 51.2 mm length of the IPC-TM-650 2.5.4.1A test board) and by radiation, with an emissivity of 0.9 for the laminate and 0.1 for the bare copper trace. Forced air, an enclosure and other orientations are not modelled."
      },
      {
        "code": "thermal-model-long-trace",
        "text": "The trace is long and alone. Heat drawn off through pads, vias and leads at its ends, and heat from neighbouring traces and components, are not modelled; a short trace with heat-sunk ends runs cooler."
      },
      {
        "code": "thermal-model-plane",
        "text": "An internal trace lies at the middle of the board's thickness. A plane is one solid copper layer under the trace, across a 76.2 mm (3 in) wide board, the stated distance of dielectric below the trace. A plane above the trace, a second plane, or a plane cut away under the trace is not modelled."
      },
      {
        "code": "thermal-model-margin",
        "text": "The board-specific rise includes a 15 % margin for the model's measured disagreement with published data: it is 1.15 times the model's rise."
      },
      {
        "code": "thermal-model-heat",
        "text": "The model's Joule heat uses the copper resistivity of IPC-TM-650 2.5.4.1A, 10.827 Ω·cmil/ft at 25 °C for 1 oz and heavier copper and 11.529 Ω·cmil/ft for lighter, rising 0.393 % per °C. The resistance and power outputs keep 1/58 Ω·mm²/m."
      },
      {
        "code": "thermal-model-ambient",
        "text": "The board-specific rise is computed at the ambient entered: it sets the air’s properties, the radiation and the copper’s resistivity, so a hotter ambient gives a somewhat larger rise."
      },
      {
        "code": "thermal-model-range",
        "text": "Outside the model's validated range (Width 0.25–5.1 mm (internal from 1.27 mm), copper ½–3 oz, board 1.4–3.2 mm, a plane from 0.1 mm under the trace to where it fits, plane copper ½–2 oz, rise 5–100 °C, ambient 0–85 °C) the board-specific rise is still reported, flagged with a warning naming the bound. On boards thinner than 1.4 mm, IPC-2152's published thickness data show traces running hotter than the model predicts, so the IPC-2152 Figure 5-1 rise is the one to use there."
      }
    ],
    "validRange": {
      "status": "inside",
      "bounds": {
        "current": {
          "min": 0,
          "max": null,
          "unit": "A"
        },
        "traceWidth": {
          "min": 0.1,
          "max": null,
          "unit": "mm"
        },
        "copperWeight": {
          "min": 0.5,
          "max": null,
          "unit": "oz"
        },
        "ambientTemp": {
          "min": null,
          "max": null,
          "unit": "°C"
        },
        "traceLength": {
          "min": 1,
          "max": null,
          "unit": "mm"
        },
        "boardThickness": {
          "min": 0.2,
          "max": 6,
          "unit": "mm"
        },
        "planeDistance": {
          "min": 0,
          "max": 6,
          "unit": "mm"
        },
        "planeCopperWeight": {
          "min": 0.5,
          "max": 2,
          "unit": "oz"
        },
        "isExternal": {
          "min": 0,
          "max": 1,
          "unit": ""
        },
        "laminate": {
          "min": 0,
          "max": 3,
          "unit": ""
        },
        "standard": {
          "min": 0,
          "max": 1,
          "unit": ""
        }
      },
      "outside": [],
      "model": {
        "description": "IPC-2152 Figure 5-1 through I = 0.024·ΔT^0.44·A^0.725, checked against IPC-2221 (1998) Figure 6-4 chart C (the same chart) at 10 to 45 °C and up to 700 sq mil: the rise is within −5.7 % to +7.3 % of 12 chart readings, and 18 % low at 10 °C and 700 sq mil",
        "worstCaseError": 0.18,
        "inside": true
      },
      "models": [
        {
          "description": "IPC-2152 Figure 5-1 through I = 0.024·ΔT^0.44·A^0.725, checked against IPC-2221 (1998) Figure 6-4 chart C (the same chart) at 10 to 45 °C and up to 700 sq mil: the rise is within −5.7 % to +7.3 % of 12 chart readings, and 18 % low at 10 °C and 700 sq mil",
          "worstCaseError": 0.18,
          "inside": true
        },
        {
          "description": "rftools thermal model (board-specific), a closed-form thermal network fitted to rftools' own committed 2-D solver of the trace's cross-section: Width 0.25–5.1 mm (internal from 1.27 mm), copper ½–3 oz, board 1.4–3.2 mm, a plane from 0.1 mm under the trace to where it fits, plane copper ½–2 oz, rise 5–100 °C, ambient 0–85 °C (the rise before the margin). Inside that range its rise is within 2.81 % of 3,168 solver results",
          "worstCaseError": 0.029,
          "inside": true
        }
      ]
    },
    "computedAt": "2026-09-24T14:05:11.003Z",
    "inputs": {
      "current": 3,
      "traceWidth": 2,
      "copperWeight": 1,
      "ambientTemp": 25,
      "traceLength": 100,
      "boardThickness": 1.6,
      "planeDistance": 0,
      "planeCopperWeight": 0.5,
      "isExternal": 1,
      "laminate": 0,
      "standard": 0
    },
    "seed": null,
    "elapsedSeconds": 0.003
  }
}

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

Una entrada enviada como texto. No se contó nada.

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

Demasiadas solicitudes en un minuto, con Retry-After.

Las mismas entradas en la página de la calculadoraCalculadora de Temperatura de Pista PCB, con estos valores