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ISOM8110: The impact of common-mode noise

Shinichi Inoue
Guru 21951 points
Part Number: ISOM8110


Dear Specialists,

My customer is interested in ISOM8110 and has a question.

I would be grateful if you could advise.

---

The ISOM8110 uses a silicon dioxide-based (SiO2) isolation barrier internally.
Is there any concern that common-mode noise will leak to the secondary side?
Is this inferior to a photocoupler?

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I appreciate your great help in advance.

Best regards,

Shinichi

  • +1
    TI__Mastermind 31905 points

    Hello Shinichi-san, 

    Common mode noise coupling is generally dictated by the capacitance from side 1 to side 2. The ISOM811x family has a barrier capacitance (CIO) of 1pF and most opto-couplers are around the same. Therefore, we do not expect a significant performance shift compared to optocouplers.  

    Best,
    Andrew

  • 0 in reply to Andrew J
    Guru 21951 points

    Hi Andrew,

    Thank you for your reply.

    I shared your answer with the customer.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi