Hi Mark,
That is an interesting point you make about using aluminum electrolytics with a higher diameter to length ratio.
A recent capacitor discussion on Tekscopes included links to capacitor data sheets about the brand and series being discussed, and in one of the data sheets I saw that even within the same series of capacitor the ratings went up with larger diameters.
Wish I could remember the exact brand and series of capacitor so I could find that same data sheet again.
tom jobe...
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On 8/12/2018 2:58 PM, Mark Goldberg wrote:
On Sun, Aug 12, 2018 at 12:42 PM, machineguy59 via Groups.Io <
machineguy59@...> wrote:
I don't share your disdain for tantalum electrolytic capacitors. Their
dramatic failure modes to happen when they are operated near their rated
voltage. For this reason, I de-rate their voltage application by more than
4:1. That seems pretty safe by most accounts. Also, I chose capacitors
with an ESR equivalent or less than the aluminum capacitors they replaced
(smaller ones were available at higher ESR). I know nothing of the
"ethics" of tantalum capacitors or their vendors.
I have been using Kemet T494 series SMD -55 C to +125 C Low ESR Tantalum
for a very long time in aviation products and have not had issues. They
claim to use "conflict free Tantalum". I have also used high quality
electrolytics with higher diameter to length ratios if I needed really big
capacitance.
Regards,
Mark
