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TCAN1043A-Q1: CAN-FD line Ground Stitching Query.

Jihoon Kim
Intellectual 460 points

Part Number: TCAN1043A-Q1

Hi TI,

I am designing a CAN-FD differential pair on a multilayer PCB, and I have a question regarding the recommended spacing of ground stitching vias along the CAN-FD traces.

Currently, I placed stitching vias very densely (about 0.5 mm spacing) on both sides of the CAN-FD differential pair. However, since CAN-FD operates at relatively low frequencies (up to around 5–8 Mbps), I am not sure whether such a dense via fence is necessary or if it could introduce unnecessary parasitic effects.

Could you advise on the appropriate ground stitching via spacing (or whether a via fence is even needed) for CAN-FD traces?
I would like to understand TI’s recommendation for:


Q) the recommended via-to-via spacing ? (below Capture's Sv data)

image.png
Thank you for your guidance.

Best regards,