TCAN844-Q1: Abs Vdiff difference between TCAN844-Q1 and TCAN1044A-Q1

Part Number: TCAN844-Q1
Other Parts Discussed in Thread: TCAN1044A-Q1,

Tool/software:

Hi Expert,

As you can see, TCAN844-Q1 abs max Vdiff is ±12V, TCAN1044A-Q1 is ±45V. Customer is using TCAN844 to take place TCAN1044A. They has a concern for below question:

  1. whether TCAN844 has a weak protection for Vdiff? Or whether ±12V is enough for Vdiff protection?
  2. What's the difference between Vbus and Vdiff?  Vbus is the voltage relative to GND?