Review Request – Migrating EMIF02-USB03F2 to USBDF01W5 on Custom Board

[rohithinthingstech]

Hello STM Community,

I am developing a custom board based on the MB997E reference design. In this design, the EMIF02-USB03F2 (USB ESD/EMI protection device) is used, but since this part is now obsolete, I am migrating to the USBDF01W5.

I have updated the schematic accordingly (attached). The design also uses:

• STMPS2141STR (USB power switch)

• USBDF01W5 (replacing EMIF02-USB03F2)

• Standard USB connector (475900001)

I would like to request the STM experts and community to please review my schematic connections with focus on:

1. Correct integration of USBDF01W5 in place of EMIF02-USB03F2.

2. Any impact on EMI/EMC test compliance due to this migration.

3. Whether additional filtering (e.g., common-mode choke, RC filters) is required for better EMI performance.

4. Placement/grounding recommendations to ensure ESD robustness.

5. Review of the series resistors (22 Ω on D+/D– lines) and overall USB signal integrity.

Since EMIF02-USB03F2 included EMI filtering while USBDF01W5 mainly provides ESD protection, I am concerned if this change may cause EMI test compliance issues during certification.

Could you please provide a full review of the circuit and suggest if any modifications are needed to ensure stable operation and successful EMI/EMC test results?

[rohithinthingstech]

any update?

 

[rohithinthingstech]

Could you please let me know if there are any updates or guidance from the STM experts or community regarding my schematic review? I want to ensure my design is compliant and stable before proceeding to PCB fabrication and testing.