was released, and is currently the latest version. It is designed to run on 32-bit or 64-bit editions of Windows 7, 8, 8.1, 10, and macOS 10.9+. Summary of major changes from LTspice IV to LTspice XVII are: Add 64-bit executables. Add Unicode characters in schematics, netlists, plot. Add device equations for IGBT, diode soft recovery, arbitrary state machine. Add user-defined symbol and library directory search path settings to the LTspice control panel. Add schematic thumbnail and preview support on Microsoft Windows. Add editors for most SPICE commands. Add multi-monitor support. Updates Every month, LTspice updates have been released with new SPICE models, fixed SPICE models, or software changes. At any time, a user can manually update LTspice by choosing "Sync Release" from the "Tools" pulldown menu. From the "Help" pulldown menu, "Show Change Log" displays a list of every SPICE model and software change since LTspice XVII was first released. In March 2017, Linear Technology merged into Analog Devices. Over time, SPICE models for Analog Devices components have gradually been added to LTspice. In August 2021, Maxim Integrated merged with Analog Devices. Since then, SPICE models for Maxim components are being gradually added into LTspice. Updates are no longer provided for Windows XP and MacOS 10.9, as well as older versions of Windows and MacOS. Device models LTspice ships with thousands of third-party models (capacitors, diodes, inductors, resistors, transistors, ferrite beads, opto-isolators, 555 timer, and more), as well as macro models for Analog Devices and Linear Technology parts (ADCs, analog switches, comparators, DACs, filters, opamps, timers, voltage references, voltage supervisors, voltage regulators, 0.01% quad resistor networks, and more). In the device library, Analog Devices part numbers start with "AD", and Linear Technology parts start with "LT". LTspice allows a user to choose from device models that ship with LTspice, as well as allows the user to define their own device model, or use 3rd party models from numerous electronic component manufacturers, or use a model from a 3rd party device library. Starting with LTspice XVII, control panel settings were added to allow the user to specify search directories for 3rd party device symbols and libraries. See option setting at LTspice -> Tools -> Control Panel -> Sym. & Lib. Search Paths. The text that describes intrinsic SPICE models can be placed directly on an LTspice schematic by using the spice directive .op button. The advantage of this method is