Hello,
I am refurbishing several dozen NSK ESA-J1003AFD-20 motor drivers, including a full re-capping per my senior lead’s request, and I have run into an issue with parts availability.
One of the capacitors I am looking to replace is an aluminum electrolytic with the following specs: 0.22uF, 50V, 105C, 7mm height, 4mm diameter, and 1.5mm lead spacing. The manufacturer is either Nichicon or Rubycon (this cap does not have the manufacturer printed on it, but all the other caps in the motor drivers are the same color and font and are from one of those two manufacturers).
I have checked online inventory of similar capacitors at several distributors, but it would appear that 0.22uF aluminum electrolytics have been phased out and are no longer being manufactured.
What would be a suitable replacement for this part? I suspect I will have to switch to a different style of capacitor- would I be able to use a ceramic capacitor if I find one with similar specs?
Greetings,
While obsolete, I’m still seeing some significant stock available for P/N EEA-GA1HR22 at this moment that looks like a good fit.
That said, “suitable replacement” is a subjective term; what’s tolerable in one circumstance may not be in another.
The main thing I’d worry about when swapping in a ceramic is that most (other than the C0G and its kin) have a nasty entanglement between DC bias and capacitance; running your typical X#R near rated voltage can easily result in an 80%+ loss of capacitance. To a lesser degree the lower ESR typical of a ceramic compared to a 'lytic might be an issue in some circumstances. Film caps would also usually have lower ESR, but better value stability at cost of more physical bulk.
This resource discusses capacitors at some length and might be of interest.
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It’s very curious- I had attempted to order those same Panasonic capacitors you just linked me to last week on 11/5, but the “add to cart” button was unavailable then and the customer service chat told me they had sold out but the stock numbers hadn’t updated yet. That was what sent me down this rabbit hole of trying to find a different substitute.
Looks like they are orderable again! I just ordered 200 of them. I doubt I ever would’ve re-checked their availability if not for your response.
Thank you very much for the help! I am relieved I will not have to deal with the potential complications of swapping in a different type of capacitor. I saved your capacitor guide to my reference folder, as it answers several other questions I had not asked yet.
I believe my problem has been decisively resolved. Thanks again.
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