It depends what the cap is used for.
Tantalum characteristics dear to designers:
1. Low ESR
2. Low leakage (electrical, not chemical!)
3. Stable capacitance
You will not get (3) with an aluminum electrolytic, and you will not find (1) and (2) simultaneously in a single part.
In most reservoir and bypass applications, only (1) is important and a size-upgraded low-ESR aluminum will do.
In timing applications, (2) and (3) are critical and if a film part will fit, that's the way to go.
?I probably haven't covered all the bases.
HTH,
Dave Wise
________________________________
From:
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[email protected]> on behalf of Dave Peterson via groups.io <davidpinsf@...>
Sent: Sunday, January 17, 2021 8:24 AM
To:
[email protected]Subject: Re: [TekScopes] 465 55v regulated filter cap type.
Ah yes, Wet Tantalum.
Any of the Tantalum caps are replaceable with Electrolytic, right? Is the only reason they were used was the size (capacitance, space, money) technology at the time? Are their any other properties about this capacitor's location that are significant in its selection? Why such a leaky mess was used? (Seems very common).
I've added the TVA1402 to my Mouser list for this scope, but will look into Daves recommendation too. Curious to see what comes up for those dimensions.
Thanks guys!
Dave
