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?


2 Answers 2


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.


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

  • 2
    \$\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

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.