You are making a mistake:
https://www.kemet.com/en/us/capacitors/tantalum.html
Axial, axial hermetic and radial types.
https://www.kemet.com/en/us/capacitors/tantalum.html
Axial, axial hermetic and radial types.
I told you above, there are many different kinds. I make my purchases from Mouser, haven't failed me yet.
Is it advisable as for normal electrolytics to buy tantalum with a slightly higher voltage in case of replacement?
It really depends on the circuit. It is not advisable to blindly buy capacitors and replace as is.
I simply want to replace the old tantalum with over 40 years of life placed on the pcb with the new tantalum to guarantee a longer life for the electronics and for greater security, possibly choosing to buy tantalum with a slightly higher voltage withstand than the original tantalum if there are no contraindications that I would like to know.
I hope my intention has been well understood.
Yes, if you replace tantalum, it will be fine. Just get polymer ones. From your post i though you were asking about replacing electrolitics. If it's smd, just get the highest voltage possible for the same footprint, and make sure it is the same or higher than the one currently in.
I checked the costs of the polymer tantalum......suicide thinking I should change about sixty. 
I necessarily have to cut costs by reducing ambitions... lead tantalum and even for those the costs are not low.
I necessarily have to cut costs by reducing ambitions... lead tantalum and even for those the costs are not low.
4) 470 uF 3,15 V
4) 22uF 16V
14) 3,3uF 16V
20) 1uF 35V
6) 4,7uF 35V
they are not a few pieces, moreover I would have liked to buy them with higher voltage.
4) 22uF 16V
14) 3,3uF 16V
20) 1uF 35V
6) 4,7uF 35V
they are not a few pieces, moreover I would have liked to buy them with higher voltage.
I'd recommend these, if the diameters will fit with the chosen DCV.
In Europe, Farnell should have them.
https://www.digikey.com/short/b2cqdf7h
In Europe, Farnell should have them.
https://www.digikey.com/short/b2cqdf7h
IMHO, they have to be de-rated. They should never be used where current isn't well limited in the event of a short. They should never be used in a low impedance high slew situation. Given that, modern ones are reliable. I have some test equipment where I never want to rebuild the thing in my lifetime- I used properly selected tantalums because they don't age. They don't really have any magic properties compared to modern aluminum electrolytics and don't offer much of a size advantage anymore. They can distort audio signals and I'd never use one in a filter, but they work OK for coupling where the value is extremely large and the impedance is low at the frequency of interest. For most things you won't be wrong to replace them with aluminum electrolytics.
They MUST be derated, always. It is stupid as the manufacturer also could label them correctly one would think 🙂 A 4.7 µF 35V one would then be a 4.7 µF 16V one. Odd just like indicating the "+" instead of the usual "-". It does not make the products more accepted to say the least.
I use the recent types a lot but never experienced distortion?!
I use the recent types a lot but never experienced distortion?!
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Likewise. Mostly Kyocera.
@Conrad Basson how come it isn't much of a size difference? It is a world of size difference tbh, especially smd. If you tend to fit as much in as little space, they still are the king by far.
I am inclined to replace components which tend to deteriorate after many, indeed many years, losing the characteristics they possessed when new (generally electrolytic capacitors) but I am not an electronic engineer and not being absolutely any better than the team of engineers who designed the electronics I don't want to do my own thing.
So I try to respect the projects of the engineering staff by replacing the components with other equivalent but only more modern respecting the capacity of the electrolytic capacitors but preferring higher voltages both because everything is not always immediately available and to obtain a safety margin, in addition to choose whether to switch from 85° to 105° condensers to be more protected.
Furthermore, in electronics of 40 years and over the datasheets are not available and wanting to do a perfect job it would be necessary to turn to different series or families of capacitors from the same manufacturer, evaluating what to put and in which point of the circuit the capacitor should be applied; for these choices the datasheets help but one would end up going crazy in the choice requiring a lot of time ... time that none of us has available and as I have already written the large distribution majors do not always have everything they need in stock and if the material not is available, no time to waste waiting.
I believe that if the team of designers at that time established that tantalum capacitors are needed in that circuit, in that project, it would be advisable to continue with what was decided in the project with the replacement the same identical, rather than putting other types of capacitors so as not to change the will of the team.
Unfortunately, tantalum capacitors cost today as they did then (polymers have costs that are impossible to sustain) and it is not always possible to spend money (a lot of money) to replace old tantalum with new tantalum, so it would be necessary to compromise without distorting the original design without getting worse instrumental measurements or raising technical problems and above all without making the sound worse.
For information, the electronics to be replaced by electrolytic and tantalum capacitors is a Sony preamplifier model TA-E88.
The two primary reasons for using Tantalum capacitors was their small size and their low leakage characteristics. Low leakage = low noise, which is why they were commonly used in high gain audio and instrumentation equipment.
I like the Kemet R82 film capacitors for all Tantalum and electrolytic replacements of 4µ7 and below. They are available in 50V & 63V (reasonably sized), and I always order the long lead types ( CK, DQ, Z3) to ensure that they will install on the boards.
For the 4µ7, 3µ3 & 1µFd requirements, I would choose from these:
https://www.digikey.ca/en/products/...MuV5jkofZxqU4HlZgY4Rl7jy2rhPjzSno4bc6VcQABfIA
For values above 4µ7, I use Nichicon UKL Low Leakage electrolytics:
https://www.digikey.ca/en/products/...TBNCCpBjgcWSHBoBmEExYAmRBygAXAE4BXXiUjkKoxpqA