| ??? 02/05/05 08:08 Read: times |
#86610 - Watch out for tantalum Responding to: ???'s previous message |
Kai Klaas said:
Mehdi said:
For example .1uf multilayer capacitor
.1uf electrolyte capacitor .1uf tantalium ... Another issue is reliability. Here the aluminium electrolytic shows the poorest performance, although drastical improvements were made in the last years. An aluminium electrolytic often quits its service life with an increase of impedance, the capacitors tends to 'dissapear' more and more. The tantal likes it to quit its service life by introducing a short circuit! Not a nice way, as without current limiting an explosion can occur. Tantalum capacitors will also present a short when connected in reverse. Just as Kai suggested, when sufficient current is available in such a situation, it is actually possible for the tantalum capacitor to burst into flame. Be careful with your tantalum caps! With these both types of electrolytics reliability is not only a theoretical issue, they do really die from time to time! Just two weeks ago I had a tantal short circuiting in an rather unspectacular circuit, a sine generator. Means no heavy ripple currents or other service life shortening signals were applied to this cap.
We have just scratched the surface about the pros and cons of various capacitor types. As long as we are on the subject of electrolytics, one thing particularly of note is that electrolytic capacitors experience significant leakage, meaning that once charged, they will slowly lose their charge all on their own quite fast. --Sasha Jevtic |
| Topic | Author | Date |
| capacitor difference? | 01/01/70 00:00 | |
| re: Capacitor difference | 01/01/70 00:00 | |
| Try this | 01/01/70 00:00 | |
| Difference | 01/01/70 00:00 | |
Watch out for tantalum | 01/01/70 00:00 | |
| Capcitor tutorial | 01/01/70 00:00 |