Skip to main content
DD-CAT IDE logoDD-CAT IDE

芯片发热 / 结温Calculate器

Favorite

按芯片dissipationand「结 → 壳 → 散热器 → Surroundings」热阻链,Calculate结温、壳温and散热器Temperature,并对比无散热器方案、校核最高结温裕量。

Key points

芯片发热 / 结温Calculate器: 按芯片dissipationand「结 → 壳 → 散热器 → Surroundings」热阻链,Calculate结温、壳温and散热器Temperature,并对比无散热器方案、校核最高结温裕量。 Formula: θJA(总) = θJC + θCS + θSA | Tj = Ta + P × θJA | Tc = Tj − P × θJC. Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. 热阻Series相加(andResistanceSeries同理):带散热器总Thermal resistance θJA = θJC + θCS + θSA,其中 θCS 是界面热阻,涂硅脂可显著降低。 Junction temperature Tj = Ambient temperature Ta + dissipation P × 总Thermal resistance θJA;dissipation P 几乎全部转为热,可用压差 × current或 I²R 估算。

Inputs

θJA(总) = θJC + θCS + θSA | Tj = Ta + P × θJA | Tc = Tj − P × θJC
Common conversions (one-click unit switch)

Calculation model (updates with parameters)

θJC1.5 °C/WθCS0.5 °C/WθSA15.0 °C/W42.0 °C40.5 °C40.0 °C25.0 °C结壳散热器Surroundings热流 P = 1.00 W(结 → Surroundings)θJA(带散热器) = θJC + θCS + θSA = 17.0 °C/W
总Thermal resistance θJA(带散热器)17.0 °C/W°C/W
Junction temperature Tj(带散热器)42.0 °C°C
壳温 Tc(带散热器)40.5 °C°C
散热器Temperature Ts40.0 °C°C
Junction temperature Tj(无散热器)87.0 °C°C
结到Surroundings温liter ΔT17.0 °C°C
结温裕量(对 Tj(max))83.0 °C°C

Engineering notes

  • 热阻Series相加(andResistanceSeries同理):带散热器总Thermal resistance θJA = θJC + θCS + θSA,其中 θCS 是界面热阻,涂硅脂可显著降低。
  • Junction temperature Tj = Ambient temperature Ta + dissipation P × 总Thermal resistance θJA;dissipation P 几乎全部转为热,可用压差 × current或 I²R 估算。
  • 壳温and散热器Temperature是实测依据:Tc = Tj − P × θJC,Ts = Ta + P × θSA,实测壳温/散热器Temperature即可反推结温。
  • 降额设计:常规商用芯片 Tj(max) 125°C,建议结温 ≤ 105°C(留 20°C 裕量);工业 / 车规常见 150°C。
  • θJA and PCB 铺铜强相关:Data手册 θJA 常按 JEDEC 标准板给出,加铜皮 / 过孔阵列后Actual θJA 会更低。

FAQ

What is 芯片发热 / 结温Calculate器 for?
按芯片dissipationand「结 → 壳 → 散热器 → Surroundings」热阻链,Calculate结温、壳温and散热器Temperature,并对比无散热器方案、校核最高结温裕量。
What is the formula for 芯片发热 / 结温Calculate器?
Core formula: θJA(总) = θJC + θCS + θSA | Tj = Ta + P × θJA | Tc = Tj − P × θJC. The tool returns results instantly using this formula and the selected parameters.
What engineering notes should I keep in mind when using 芯片发热 / 结温Calculate器?
热阻Series相加(andResistanceSeries同理):带散热器总Thermal resistance θJA = θJC + θCS + θSA,其中 θCS 是界面热阻,涂硅脂可显著降低。 Junction temperature Tj = Ambient temperature Ta + dissipation P × 总Thermal resistance θJA;dissipation P 几乎全部转为热,可用压差 × current或 I²R 估算。 壳温and散热器Temperature是实测依据:Tc = Tj − P × θJC,Ts = Ta + P × θSA,实测壳温/散热器Temperature即可反推结温。 降额设计:常规商用芯片 Tj(max) 125°C,建议结温 ≤ 105°C(留 20°C 裕量);工业 / 车规常见 150°C。 θJA and PCB 铺铜强相关:Data手册 θJA 常按 JEDEC 标准板给出,加铜皮 / 过孔阵列后Actual θJA 会更低。