Thanks for the heads up on the LT4363.
That actually leads me to a followup question. Say in the future I'm faced with choosing between two surge suppressors like the LT4356 and LT4363. If I had a Linear representative over my shoulder, he/she could point to the 4363, as you did, and explain why the 4363 is a superior device. As a non-expert, though, I may not have recognized that subtle difference you explained. Obviously the datasheet for the 4356 is written to laud the capabilities of the device, so it's not going to point out its own shortcomings. In this specific example, what resource at linear.com could I have used to recognize that the 4363 is an upgraded and superior replacement for the 4356? Ideally, for example, there would be a chart that shows each Linear device and a link to a replacement part that is considered better. Does such a resource exist?