It is easy to distinguish whether an IC has an input-tolerant function.
Let’s look at the datasheets for ICs of the TC74HC and 74VHC Series.
See the input voltage shown in the Operating Ranges table.
The datasheet of the TC74HC Series shows VIN＝０ to VCC. This means that the input pin is tolerant of only up to VCC. Therefore, the TC74HC Series does not have an input-tolerant function.
In contrast, the datasheet of the 74VHC Series shows VIN＝０to 5.5 V, meaning that up to 5.5 V can be applied to the input pin regardless of VCC. Therefore, the 74VHC Series has an input-tolerant function.