TCAN1051HV-Q1: How to select the external CANH/L TVS?

Ted Zhang

Intellectual 2280 points

Part Number: TCAN1051HV-Q1

HI Team,

Do we specify the max voltage for the CANH/L to device ground?

What's the voltage for the internal TVS of the CANH/L if there is?

And also how to select the external CANH/L TVS?

Do we have any guidance?

Thanks

over 5 years ago

0 Eric Hackett over 5 years ago

TI__Guru 74252 points

Ted,

Yes, it is in the datasheet under the Absolute Maximum rating table on page 5. The CANH and CANL pins for the non-H version are rated to -58V and +58V. The internal protection of CANH and CANL capabilities are listed in the ESD Ratings table on page 5 in the datasheet as well. These pins have ESD protection which protect against high-voltage transient strikes.

If the customer needs more external protection, you'll want to choose a TVS diode which has a clamping voltage less than the absolute maximum rating of the pin, and a standoff voltage close to the operating voltage of the pins. For CAN transceivers, this is a very large range, so I would recommend choosing the PESD1CAN device. It's a proven diode in many different CAN applications.

Please let me know if you have any other questions.

Regards,

0 Miguel Robertson over 5 years ago in reply to Eric Hackett

TI__Guru 62920 points

In addition to Eric's comments above, I wanted to point out that you could reference this blog for further info on how to choose a TVS device to protect an interface transceiver:

https://e2e.ti.com/blogs_/b/industrial_strength/archive/2017/11/13/how-to-choose-a-tvs-diode-for-rs-232-rs-485-and-can-based-on-voltage-ratings

Regards,
Max

Interface

Interface forum

TCAN1051HV-Q1: How to select the external CANH/L TVS?