CANBUS, understanding if a tranceivers is 3V compatible or not
Assuming you mean the most common SOIC-8 packages, then:
No, isn't an universal method because pin 5 isn't standardized - there's nothing called &quot;VIO&quot; universally. You just happened to come across two similar parts.
On one of the most commonly used parts, MCP2551, which is 5V only, pin 5 is a reference voltage output defined as Vdd/2. On some other parts pin 5 is used for slope control. On other parts it is used for split termination. On other parts it is used for loopback mode and so on.
You have to read the datasheet to tell what pin 5 does and how it works.