SN65HVD251: what is the best part to replace PCA82C250?

Aki,

Do you need standby or silent mode?

The TCAN1042 may also be a suitable choice, it will depend on how the Rs pin will be used. Vref isn't necessary in newer CAN transceivers because it is meant to help with EM emissions from the bus by stabilizing the common-mode voltage on the bus. This was typically done on older CAN transceivers, but with TI's TCAN family, the common-mode stabilization isn't necessary. 

If Rs is being used for slope control and not just mode transitioning, then SN65HVD251 is the best choice, but if you're only needing it for the low-power mode, TCAN1042 or TCAN1051 are the best choices.

Please let me know if you can provide more information, or if you have any other questions.

Regards,

Eric, 

 Thank you for the prompt response. I am a bit confused by your comment. Could you help send me some materials if you have for my better understanding? What we want to do is to select the best option to compete, regarding both performance and cost.

Aki,

Sorry for the confusion, I sent over an email to you. Basically, the TCAN1042 or TCAN1051 would be the best replacement for the PCA82C250 since the Vref output is not needed for these devices. What I need to know now is:

• Is the customer using a low-power mode in their application?
• Is the customer using slope-control in their application?

Regards,

Eric,

Thank you for the explanation. I will check with customer to see which one is the right one. 

TCAN1042 or TCAN1051 is also pin to pin to PCA82C250, right?

Aki,

Yes, pin 5 is Vref on the PCA82C250, and on TCAN1042/TCAN1051 it is a NC. As I explained previously, the Vref is not necessary on the TCAN devices. Pin 8 on the PCA82C250 is Rs which is slope control and standby mode control. On the TCAN1042/TCAN1051, this is the standy/silent mode control. 

If the customer is using a low-power mode, knowing which one they would like would help in recommending either the TCAN1042 or the TCAN1051. TCAN1042 has standby mode and TCAN1051 has silent mode. Standby mode is a lower-power consuming mode that disables the CAN bus transmitter and receiver, and enables a low-power reciever to monitor for bus wake signals, significantly reducing current consumption when the CAN node is not needed. Silent mode disables the bus transmitter but keeps the receiver enabled, allowed the node to "listen" to the bus, but not respond and transmit to the bus.

If they are using the slope control mode as well, this is probably to help with emissions. Again, this won't be needed on the TCAN family of 5V transceivers.

Please let me know if you have any other questions.

Regards,

Eric,

Thank you for the detailed explanation. One more question about the slope control mode, you mentioned "If Rs is being used for slope control and not just mode transitioning, then SN65HVD251 is the best choice” at the very beginning, but you said  TCAN family is also suitable for slope control mode in the latest response?