DIYEFI.org Forum

See here for a brief overview of TVS diodes

http://en.wikipedia.org/wiki/Transient_ ... suppressor

And here for a datasheet about these types of diodes.

http://www.st.com/stonline/products/lit ... n/5628.pdf

Also a good one.

http://www.littelfuse.com/data/en/Appli ... an9768.pdf

[edit] good as well, titled "How To Select Transient Voltage Suppressors"

http://www.microsemi.com/micnotes/125.pdf

[edit] also good, titled "Protecting Data I/O Ports With TVSarraysTM"

http://www.microsemi.com/micnotes/121.pdf