Which ones would you use for protecting a low voltage signal input (digital)? Schottky or regular? I plan on using it in this configuration:
Or is there a better way?
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Super-barrier diodes offer the same speed/low-forward voltage drop as schottkys, but have better leakage characteristics. The ones I have seen have been more expensive than schottky diodes, but if power is at a premium in your design (battery powered?) it may well be worth the additional expense.