@Bordodynov has a huge library of SPICE models. http://bordodynov.ltwiki.org/ E. Thread Starter. All About Circuits Simple 555 timer Delay ON not working on LTspice - EEVblog
If the symbol does not automatically link to the model, use a SPICE directive (keyboard shortcut 'S') and type .lib NE555.sub (replacing with your actual filename). Troubleshooting Common Issues Spice Model For LM555 Timer - All About Circuits Forum
The standard installation of LTspice includes an NE555.asc example in its educational folder, which contains a detailed transistor-level model that can be extracted into a library. Manufacturer Portals: You can download the Go to product viewer dialog for this item. Go to product viewer dialog for this item.
Several reliable sources provide models ranging from simplified macromodels to full transistor-level simulations:
models directly from Texas Instruments, though these may require slight modifications to run smoothly in LTspice.
Place the or .lib file in: Documents/LTspiceXV11/lib/sub .
Open LTspice, click the Component icon, navigate to the folder where you saved the symbol, and select your 555 model.
The Bordodynov library on LTwiki is a famous repository for hundreds of verified discrete component models, including various 555 timer variants. How to Install Your 555 Timer Model