SN65HVD1040-Q1: Will this device works for 3V3 and 5V0 sub-system power

Good morning Richard,

thanks for reaching out!

Q1: Some PCB module operate on 3V3 power bus (no 5V) and some operate on 5V0 power bus. How the CAN transceiver handle this?

A1: In a Nutshell - CAN receivers measure differential voltage on the bus to determine the bus level. Since 3.3V transceivers generate the same differential voltage (≥1.5V) as 5V transceivers, all transceivers on the bus (regardless of supply voltage) can decipher the message. In fact, the other transceivers can’t even tell there is anything different about the differential voltage levels.

You can take a look at this application note -> slla337.pdf

Further this E2E post is addresses this topic -> https://e2e.ti.com/support/interface/industrial_interface/f/142/p/230101/808205?tisearch=e2e-quicksearch&keymatch=mixed%20can%205V%20and%203V#808205

Q2: What the alternative to SN65HVD1040 for 3V3, must ve 125C grade

A2: Definitive the TCAN1042Q1! It is our new device generation which is superior to the SN65HVD1040-Q1 in any aspect.

Please take a look here -> http://www.ti.com/assets/js/compareParts/compare.html?familyId=540&parts=TCAN1042-Q1,SN65HVD1040-Q1&cols=o1,p1389,p305,p1711,p726,p976max,p1712,p1687,p1634,p1690,p1498,p1192,p2954,p1130,o4&lang=en 

Let me know if this is answering your request. If there is anything else, don't hesitate to ask!

Kind regards

Dierk