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Which ones would you use for protecting a low voltage signal input (digital)? Schottky or regular? I plan on using it in this configuration:

this configuration

Or is there a better way?

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2 Answers 2

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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.

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All CMOS use this configuration using Schottky diodes to protect every input. But they are small diodes and limited to 15mA continuous current.

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    \$\begingroup\$ Really? I would have thought that the high leakage current of Schottky diodes would wreck one of the advantages of CMOS. \$\endgroup\$ May 2, 2014 at 1:34
  • \$\begingroup\$ It would, if Schottky diodes were used. But, at least for CMOS, they're not. \$\endgroup\$ May 2, 2014 at 2:25
  • \$\begingroup\$ I was actually talking about external circuitry... Not the internal clamping diodes in microcontrollers and such. \$\endgroup\$
    – Pugz
    May 3, 2014 at 13:23

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