LT SPICE THERMISTOR MODEL

Do you have a thermistor model for LT SPICE? Possible parameters would be the 25 DEG C resistance and the B 25 / 50 parameter so the resistance changes correctly when running .temp T1 T2 simulations?

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  • Hello,

    I show one method using a stepped TEMP.

    The default of TEMP is 27°C if not specified. Be aware that TEMP is used by every component in your schematic - especially diodes and transistors change their behavior. You can avoid this, if you use another name e. g. TEMP1.

    .param R25=10k

    .param B=4000

    .param Tk=273.15

    .param T25=25

    Replace the value of the resistsor with this equation enclosed by curly braces.

    {R25*exp(B*(1/(TEMP+TK)-1/(T25+TK)))}

    .step TEMP 0 50 1

    Best regards,
    Helmut

Reply
  • Hello,

    I show one method using a stepped TEMP.

    The default of TEMP is 27°C if not specified. Be aware that TEMP is used by every component in your schematic - especially diodes and transistors change their behavior. You can avoid this, if you use another name e. g. TEMP1.

    .param R25=10k

    .param B=4000

    .param Tk=273.15

    .param T25=25

    Replace the value of the resistsor with this equation enclosed by curly braces.

    {R25*exp(B*(1/(TEMP+TK)-1/(T25+TK)))}

    .step TEMP 0 50 1

    Best regards,
    Helmut

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