Hi Joyce,
Hot insertion by definition includes hot removal. See: https://www.ti.com/lit/an/scea026/scea026.pdf
Yes, both the SN74LVTH16245A and the SN74LVTH2245 support hot insertion (and hot removal).
As for your last question, this FAQ might help…
SN74LVT573 , SN74LVC573A, SN74LVT373 , SN74LVC373A
If you need it clocked SN74LVT574 , SN74LVC574A, SN74LVT374 , SN74LVC374A
Thes will all have skews better than 1ns.
The SN74LVT543 was released with the Bus Hold feature.
The name should have been LVTH543.
In 1997, we issued PCN 5287A informing customers of the name change with a redesign.
In 1999, we issued PCN 5322A notified customers of the nomenclature…