Amazing AZKN9325P : CAN SIC Meets the Strictest EMC Limits. High-Speed Performance with Rock-Solid Stability

With the arrival of the intelligent vehicle era, the biggest difference between software-defined vehicles and traditional automotive platforms is that software—not hardware—now drives and manages vehicle functions. As automotive networks evolve to handle massive data loads and increasingly complex domain-controller topologies, CAN transceivers are being upgraded to the 3rd-generation CAN SIC (CAN with Signal Improvement Capability and ring-suppression technology).　

Outstanding EMC Performance at Maximum Severity Levels

Unlike conventional CAN FD transceivers, the AZKN9325P (CAN SIC, 8 Mbps) achieves higher transmission speeds by shortening bit time. Faster signal transitions generate stronger high-frequency harmonics, which can more easily radiate or couple into surrounding circuits through bus lines. The international standard IEC 62228-3:2019 defines EMC performance requirements for CAN transceivers under minimal-node topology conditions. For major European and American automakers, meeting the strictest limit values in this standard is considered a mandatory requirement when selecting CAN transceivers.  

Not Only Faster — But Truly Stable

The CAN bus uses differential signaling for data transmission. Twisted-pair wiring reduces EMI, and termination resistors at the topology endpoints also minimize signal reflections. However, when speed increases or when mixed topologies are used, maintaining signal integrity without affecting other circuits becomes critical. The international standard evaluates EMC performance through four main categories, analyzing RF emissions and immunity during both transmit (TX) and receive (RX) modes. (See Table 1.)

◆Radiated RF Emissions

Coupling tests are applied to bus and power-related pins while monitoring TX behavior using a prescribed frame format (arbitration at 500 kbps, data at 5 Mbps). Emissions from 150 kHz to 1 GHz are recorded. The 150-ohm RF voltage measurement method converts RF disturbances into measurable voltage levels.

◆RF Immunity

In RX mode, immunity is evaluated using Direct Power Injection (DPI) on the bus lines, with up to 5 Mbps data frames. The goal is to verify that the CAN SIC transceiver can withstand up to 39 dBm of forward RF power (with a common-mode choke), ensuring robustness against RF-conducted disturbances. Performance is recorded across 1 MHz to 1000 MHz under both normal and low-power modes. Meeting the highest classification level with a common-mode choke is required.

◆Impulse Immunity (Asynchronous Burst Immunity)

This evaluates how the transceiver handles asynchronous transient pulses that may occur during communication. The test simulates real-world transient disturbances to assess stability and functional reliability.

◆Device-Level ESD Robustness

This test evaluates the stand-alone transceiver mounted on a minimal PCB. Using direct discharge with a 330 Ω / 150 pF model, the bus pins must withstand at least ±6 kV. Compliance is determined by comparing pre- and post-test I/V curves. Reports include results with and without a common-mode choke, allowing controller manufacturers to choose according to system design.