Hello, I've been trying to find some bypass caps that I plan on using with a DC/DC Converter (ADuM5000). And the datasheet recommend a low inductance 0.1uF and 10uF. So, I've been googling around to try and find out what I should choose here, and I'm not sure.
First I ran into this articlewhich says "we recommend using aluminum electrolytics. These capacitors open when they fail" but then I ran into web pages that say electrolytics short when they fail....
Question 1: Is there a type of cap that is better for bypassing power supply rails because they fail open?
Ok, forgetting the fail open stuff I started to look for low esl. This led me to the reverse geometry stuff, and stacked caps, but... when I look up a low esl reverse geometry cap on digikey, the voltage is damn low, I couldn't find them over 10V. My DC/DC converter will have 5V on both input and output rails.
Question 2: How much higher should the voltage spec be for a bypass cap than the intended voltage it will be used for
Questions 3: What are the general, important basics for choosing a proper bypass cap
My guess for Question 3: Low ESL, adequate voltage spec and that it fails open. Those are the three I've been trying to use (I've also mainly been looking at ceramics). but I've been having a hard time nailing all 3.