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June 12, 2026
Question

STPM33 SCHEMATIC REVIEW NEEDED

  • June 12, 2026
  • 1 reply
  • 5 views

Schematic review needed, considering given standards IEC 610004-2, 610004-3, 610004-4, 610004-5, 610004-6, 610004-11, CISPR 14-1 CLASS A.

I have attached screen shot of my schematic, please go through it and check.

The screen shot contains

  • STPM33 IC section,
  • Reset and Digital isolator section,
  • Control reset section
  • CT section,

Please do review it. We are designing it for 115VAC with multiple loads on CT which vary till max 1A load.

Any changes/recommendation are welcomed.

Thank you.!!

 

1 reply

Peter BENSCH
ST Technical Moderator
June 12, 2026

Welcome ​@XTAL7897, to the community!

Thank you for sharing the schematics.

The community can usually help with specific technical questions and design suggestions, but full compliance assessment against those standards is typically the responsibility of the system designer and must be validated at the system level. For your design, the final result will also depend on the PCB layout, protection concept, isolation distances, grounding, filtering, and full-system behaviour.

For detailed compliance support, you might contact the application support team of your local distributor.

The community may not take over the full compliance review, but members will likely be happy to help with individual schematic questions.

Good luck!

Regards
/Peter

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