Voltage regulator datasheet does not specify input voltage
This is to answer your later question in the comments.

There are many suitable linear regulators for this, for example LM317 in TO-220 package. The choice is entirely up to you. It depends on current requirements and PCB footprint.

Having said that, I strongly recommend using DC-DC for the first stage, due to huge voltage difference. There are quite a few converters compatible with TO-220 pinout, for example from Pololu, Murata and MPS. Most of them have fixed voltage though, like 5V 3.3V and 12V. I don't know why you need 5.5V but there are some adjustable options too.

Also, if the only reason you have two-stage power is because you wanted to split heat dumping between two components, then with DC-DC you can go straight from 24 to 3.3 and simply jumper the first footprint.