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I am working on a MCU project. The MCU pins have a limit of 3.6 V and the Voh is 2.86V.

I am trying to find a TVS diode that could save the pins !!. I am getting TVS diodes with 3.3 Vrm . I believe the clamping voltage must be 3.6 but I can't find a diode which satisfies this requirement.

Can't anyone suggest me a workaround? Thank you

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1 Answer 1

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It is unrealistic to clamp to 3.6 V with a standoff voltage of 3.3 V using only an ESD diode. Realistic clamping voltages for worst case ESD strikes, are ~10..20 V.

You then place a series resistor between the TVS diode and the MCU pin to limit current to the allowable level given in the MCU datasheet.

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