Replacement caps ok? (smoothing caps, PSU heating controller)

[HectoPascal]

Hallo,
i want to replace two smoothing caps from a heating controller PSU. They are probably 30 years old and it might be time to replace them.

SXE 470uF 63V 105°C (tested: 472uF 0.35Ohm) --> Nichicon VY 105°C - 463uF 0.15Ohm
SXE 470uF 25V 105°C (tested: 422uF 0.63Ohm) --> Samwha K5A 85°C - 446uF 0.10Ohm (or Panasonic RAD FC 470/25 8mm)

I couldn't find anything about 'SXE'. That's the only declaration on the caps. Edit: The top/bottom ident says Nippon CC.
Nichicon should be 'VY' series (linked).
I couldn't find anything about Samwha K5A.

Nichicon and Samwha were bought on AliExpress (UltimateElectronics Store).

Should i swap the caps?
Are the replacement caps ok?

[stj]

Re: Replacement caps ok? (smoothing caps, PSU heating controller)

the diode with a heatsink on it has a pin ripped out of the solder - you need to look at all the soldering

also i would use panasonic FR for everything.

[Olkus]

Re: Replacement caps ok? (smoothing caps, PSU heating controller)

Are the replacement caps ok?

SXE series is Low Impedance, but your caps are 'normal'. You should buy Low ESR, Panasonic FR is a good option.

[PeteS in CA]

Re: Replacement caps ok? (smoothing caps, PSU heating controller)

The Nippon Chemicon SXE series was a low impedance series, but has been obsolete and unavailable for quite a few years. Probably the most similar current series would be Nichicon's PS series. Low impedance parts should not be replaced with general purpose parts.

[HectoPascal]

Re: Replacement caps ok? (smoothing caps, PSU heating controller)

The old caps are no more low-esr either (probably for years) and much higher than the new ones already. The device still works properly in this state. Also doesn't look like a switching PSU.
Unless there are no other concerns i think i'll give them a shot.

the diode with a heatsink on it has a pin ripped out of the solder

Yep, rather looks like a voltage regulator, though.

Thanks so far.

[stj]

Re: Replacement caps ok? (smoothing caps, PSU heating controller)

it's a diode - the 2 outer pins are linked.
probably why it still works with one pulled out!

[HectoPascal]

Re: Replacement caps ok? (smoothing caps, PSU heating controller)

it's a diode - the 2 outer pins are linked.

What would such powerful/cooled diode provide? A 50% rectifer?
The component is labeled IC01 and the pins are connected to: Rectifier-GND-Circuit. Only the upper half was ripped off.

[stj]

Re: Replacement caps ok? (smoothing caps, PSU heating controller)

parallel diodes to get more current - common in pc psu's

[HectoPascal]

Re: Replacement caps ok? (smoothing caps, PSU heating controller)

I've found the datasheet of the Samwha cap. Its an 'Samwha SA series'. You can even read it on the picture above. Regarding a 'samwha-catalogue.pdf' its obsolete since 1996 (cough. No joke, i've bought 10pcs last week on AliExpress). See page 6 (below). The substitute series (SD) is on page 75. I've found the original series datasheet as well.

Looks like they have a very good shelf time though. Mine have ESR of 0.10Ohm that is not bad for 27 years. If that's true at all. Maybe they resurrected the SA series again, they are fake or are really that old.

https://cdn.badcaps-static.com/pdfs/...71ba40f8dc.pdf
https://cdn.badcaps-static.com/pdfs/...839f853dd0.pdf

I guess i will prefer the Panasonic FC (that i already have) over the Samwha because the original SXE is 10mm, the Samwha 12.5mm and the Panasonic 8mm diameter. The Samwha might touch the trafo case and a ribbon cable socket already. Contact is not nice.