I want to protect an 12V input from ESD events. The allowed input voltage range is 0V to 12V. I could use a unidirectional TVS diode for that purpose but my colleges suggest to use a bidirectional type so that the polarity of the TVS won't matter.
With the bidirectoinal TVS the clamping voltage for negative going ESD event will be higher compared to the unidirectional type.
My question is whether it will make a difference. Is the protection provided by the unidirectinal TVS actually better or is the diffence in the clamping voltage too small to actually make a difference in terms of robustness?