How to Balance Signal Integrity and High-Level Protection for CAN Bus in ECMO Devices?

The CAN bus communication within ECMO devices demands extremely high signal integrity. Traditional protection devices, due to their parasitic capacitance, can degrade the eye diagram of high-speed signals. The solution involves using a low-capacitance TVS array specifically designed for bus applications, combined with high-performance common-mode inductors. For instance, select a TVS array with extremely low line-to-line capacitance for differential-mode and common-mode protection, while pairing it with a common-mode inductor featuring high common-mode impedance and low differential-mode insertion loss. This combination effectively filters out common-mode noise and clamps transient overvoltages. It not only meets high-level surge and electrostatic protection requirements such as ISO 7637-2 but also ensures perfect support for high-speed data formats like CAN FD.