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LTspice
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LTspice

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Q&A
  • Threads 1687 Questions
Frequently Asked
  • JasonIndy
    LTspice statement editor does not update, need to use edit text change to change param values
    Answered over 2 years ago
  • Beyazit
    LTSPICE ISO16750-2 Load Dump(Pulse 5B) Model
    Answered over 2 years ago
  • Vandersonpc
    Add a simple way to enable/disable parts (feature Request)
    Answered 5 months ago
  • markstar208
    I would like to use the legacy (pre-LTspice 24) LTspice GUI
    Answered 7 months ago
  • davidog
    Issues with LTspice 24 Search Paths
    Answered 6 months ago
  • Tags
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  • by  jcalvarez 
      LTspice
      on Jul 19 2025
       97  10  0

      Answered
      Strange issue with names 0
      Answered

      Hello! I'm having a weird issue with some schematics that where working before. Some current values in the device pins like for example, in the schematic below, are not being found by a .measure statement, but are found by .op labels and graphs: The schematic...
      software LTspice 24.1.9
       97  10  0
    • by  eewiz 
        LTspice
        on Jul 18 2025
         172  6  0

        Suggested Answer
        Simulation Lockup 0
        Suggested Answer

        First, please consider making the data values in the bottom-screen display have a fixed number of places so the display does not jitter back and forth a character or two as the simulation runs. My project runs successfully on 24.0.12 and is clean enough...
        LTspice 24.1.9 software LTspice 24.1.9
         172  6  0
      • by  Aung 
          LTspice
          on Jul 18 2025
           92  4  0

          Suggested Answer
          Importing encrypted Pspice model to Ltspice have error while simulation 0
          Suggested Answer

          I have been working on for power supply circuitry. I am using LP87702-Q1 as a buck boost converter for its variable outputs. After getting Pspice file from IT as , https://www.ti.com/product/LP87702-Q1?keyMatch=LP87702Q1#design-tools-simulation , it was...
          software LTspice LP87702 24.1.9
           92  4  0
        • by  BLACKFAB 
            LTspice
            on Jul 18 2025
             33  1  0

            Suggested Answer
            How to set up simulation command in the MAC OS version Ltspice 0
            Suggested Answer

            Hi! I can't find simulation command bar in the MAC OS version Ltspice. How to make transient and AC analysis simulation. I mean how to set up simulation by my mouse not cmd line. MAC OS version Ltspice is different from Windows version. Is there...
            software LTspice
             33  1  0
          • by  GuustFlater 
              LTspice
              on Jul 18 2025
               291  7  0

              Answered
              Option to limit the maximum number of threads 0
              Answered

              Dear LTspice support team, LTspice now can set the number of threads in the tools/settings menu: I'm looking for another way to set this value. Either through the ltspice.ini file, a dot-statement in a simulation file, or through a command-line...
              software 24.1.1 LTspice 24.1
               291  7  0
            • by  johnsolo 
                LTspice
                on Jul 17 2025
                 35  1  0

                Suggested Answer
                Infineon encrypted library BTH50015_1LUA runs under version 17, but not 24.1.9 0
                Suggested Answer

                A design simulating in LTspice requires an Infineon BTH50015_1LUA. Infineon supplies an LTspice specific model downloadable from their website, but its encrypted. My LTSpice platform is 24.1.9 and I get the following error: There is an error in file...
                software LTspice 24.1.9 Encrypted Infineon BTH50015_1LUA Show More
                 35  1  0
              • by  CAES 
                  LTspice
                  on Jul 17 2025
                   88  5  0

                  Not Answered
                  LTSPICE model for RMS detector LTC5582 ? 0
                  Not Answered

                  Hello everyone, Do you happen to have LTSPICE model for RMS detector LTC5582? Thank you Kiet P.
                  software LTC5582 RF Power Detectors Logarithmic RMS Detectors LTspice model 24.1.9 Show More
                   88  5  0
                • by  MEGAMUTANTARCSKILLZOR 
                    LTspice
                    on Jul 17 2025
                     54  2  0

                    Not Answered
                    LTspice ADR1001 issue 0
                    Not Answered

                    Dear Sir/Madam! When I use ADR1001 with +/-15V heater supply, the center tap voltage of the output divider (INV2) is latched to ~ -9V, and also output voltage is lower than I use single +15V heater voltage. Thank You! Best Regards: Zsolt ...
                    simulation software issue 17.0.37.0 LTspice ADR1001 Show More
                     54  2  0
                  • by  eewiz 
                      LTspice
                      on Jul 17 2025
                       34  1  0

                      Suggested Answer
                      24.x Ignores ic= for Capacitors Defined with Charge Q= 0
                      Suggested Answer

                      Hello All: The help file says: Syntax: Cnnn n1 n2 Q=<expression> [ic=<value>] [m=<value>] When I change; Q=4.7u*x*(1.19 - 0.03259*x + 0.0002686*x*x) ;C1 to; Q=4.7u*x*(1.19 - 0.03259*x + 0.0002686*x*x) ic=24 ;C1 nothing happens. C1...
                      24.0.12 & 24.1.9 software LTspice
                       34  1  0
                    • by  Laudio 
                        LTspice
                        on Jul 17 2025
                         50  2  0

                        Suggested Answer
                        24.1.9 parsing strictness prevents simulation 0
                        Suggested Answer

                        I like to include the models in the asc file as this avoids library mess and makes the design more portable / runable. Unfortunately 3rd partly models that include .END or .ENDS etc are now parsed very strictly and .ENDS in this model from NXP fails...
                        LTspice 24.1.9 software 24.1.9
                         50  2  0
                      • by  Burakkk 
                          LTspice
                          on Jul 16 2025
                           51  1  0

                          Answered
                          Having Trouble While Simulating 0
                          Answered

                          As you can see,my circuit is like that,I'm trying to create a switching with transistor but when I simulate,I can just see the results of the wire between the 220R resistor and LED,when I try to measure anything I get the grey probe.I'm new to LTSpice...
                          simulation Datasheet/Specs LTSPICE XVII
                           51  1  0
                        • by  sdasfdsas 
                            LTspice
                            on Jul 15 2025
                             117  3  0

                            Suggested Answer
                            Adding SPICE models 0
                            Suggested Answer

                            I have a freshly installed version 24.1.9 of LTspice with this SPICE directive: .MODEL CA3046 NPN(IS=10f BF=145.76 VAF=100 IKF=46.747m ISE=114.23f NE=1.483 BR=100.1m VAR=100 IKR=10.01m ISC=10f RC=10 CJE=1.026p MJE=333.33m CJC=991.79f MJC=333.33m TF...
                            software
                             117  3  0
                          • by  faisal344 
                              LTspice
                              on Jul 15 2025
                               43  2  0

                              Not Answered
                              Issues with LT Spice simulations 0
                              Not Answered

                              IMYHSYMBOL.asy version_integrateIMYH200R050M1H_Version12.asc Hi, please check error in this file, it runs well on mac but on windows it shows alot of simulation time , not rining
                              latest software LTspice
                               43  2  0
                            • by  chthulu 
                                LTspice
                                on Jul 15 2025
                                 89  1  0

                                Not Answered
                                Help me to troubleshoot the TDA1060 spice model 0
                                Not Answered

                                Hi, I trying to make a spice mode for the TDA1060 but the oscillator does not work. The circuit is a SPICE netlist for a sawtooth oscillator, where the oscillator's current is set by an external resistor (RX) and capacitor (CX), with additional features...
                                oscillator spice model software LTspice sawtooth 24.1.9 Show More
                                 89  1  0
                              • by  Ilyak 
                                  LTspice
                                  on Jul 15 2025
                                   41  1  0

                                  Not Answered
                                  Bug report -lt spice asked me to report, not clear how 0
                                  Not Answered

                                  Hi, Apologies if this is the wrong place, trying to be helpful and report a recurrent bug, created this account and happy to be pointed to best way to do so. Using LT spice to simulate a high voltage PSU made of several HF HV AC voltage generators...
                                  software LT spice bug 24.1.9
                                   41  1  0
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