LTspice 24 is the next release, following 17.1.15, which it replaces. Having them both on a PC is not recommended, because they'll mess with each other. This is particularly important because LTspice 24 changes the way the standard libraries are treated. The goal is to put an end to the chaos that has resulted many times from editing / merging those files. Also note that this pre-release is no beta version.
What’s New in LTspice 24
> Performance Improvements
• Faster Simulation Speed and Improved Consistency
• Default time step control error tolerance (trtol)
changed to 2 for better performance in most applications
> UI Changes
• Shift + Left-Click toggles between comment/directive
• Default keyboard shortcuts have changed
- Dynamic non-modal cheat sheet available from Help menu
- Classic shortcuts still available via
Edit Keyboard Shortcuts > Restore LTspice Classic Values
• Improved component selection dialog
- Cleaner, more intuitive layout
- New quick links to analog.com product selector, and datasheets
- Bug fixes
• New Configure Analysis toolbar button and shortcut (“a”)
- Tabs are populated with all possible simulation commands on the schematic
- Edits to all tabs are mapped to schematic text
- Schematic text is toggled between comment/directive appropriately
• New subckt symbol parameter editor dialog
• Expanded Help menu, including Open Examples
• Added Tile Windows Vertically toolbar button
• Settings dialog remembers last tab
• Command line batch mode (-b) writes to stdout instead of showing GUI
• Updated Look and Feel
- Icons and cursors have been updated
- Default background has changed
- Screen-resolution awareness & scaling has been fixed
> Waveform Viewer Improvements
• Rearranged plot panes via right-click > Move up/down, add above/below
• Added menu items, shortcuts, and buttons to add/clear cursors
- ESC key also now clears all cursors
• Annotated phase / gain margin via right-click > Notes & Annotations
• Annotated steps via right-click > Notes & Annotations
• Numerous bug fixes
-Improved marching waveforms, including cursors and dragging traces
> Frequency Response Analysis (FRA) Enhancements
• New 4-terminal probe
- Enables analysis of µModules with integrated top feedback resistors
- Simplifies analysis of inverting outputs and current feedback
- Analyze any points in the loop
• Plot phase margin (phase + 180) instead of phase
• Smooth stimuli transitions for faster settling / improved accuracy
> Changes to Management of Component Libraries and AppData
• Faster, cleaner component updates
- Libraries are cleaned up or overwritten on updates
• Optional user-defined libraries for additional discrete components
- By default, LTspice looks in Documents\LTspice for user.*
(user.dio, mos, res, cap, ind, bead, jft, bjt)
- Directory is configurable in Settings > Search Paths
• Users should not edit ADI-provided files in %localappdata%\LTspice
- LTspice will attempt to dissuade users from saving files here
> SPICE Log File Improved and Streamlined
• Report LTspice version, non-default tolerances, etc.
> Numerous bug fixes
