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ISO7341-Q1: ISO7341 Capacitors

Mike Duncan
Prodigy 10 points
Part Number: ISO7341-Q1
Other Parts Discussed in Thread: ISO6741-Q1

We have built some boards using the ISO7341CQDWQ1 chip. Due to an error, the bypass caps are 1.0uF instead of the 0.1uF in the data sheet. Should this cause any problem?

  • 0
    TI__Guru 53115 points

    Hi Mike,

    Welcome to TI E2E forum and thanks for your interest in ISO7341.

    Decoupling capacitors of 0.1µF value make sure they provide the necessary transient currents needed by the device. It is best to always have 0.1µF caps on the supply pins. Not having might not show any problems during typical operating conditions on typical samples but could create issues when operating under worst-case operating conditions especially on worst-case samples. Hence, we recommend that the capacitors are replaced with 0.1µF value.

    Please also know that ISO7341 is from one of older digital isolator families supporting only basic isolation. We have released multiple digital isolator families with reinforced isolation, thereafter. I recommend you to consider using ISO6741-Q1 which is pin-compatible to ISO7341-Q1 and offers significantly better overall performances and better isolation ratings. The 0.1µF decap values are also needed for ISO6741-Q1 as well. Thanks.


    Regards,
    Koteshwar Rao