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Below is some useful information on the shelf life and
re-aging procedures for aluminum electrolytic capacitors. The information is
from Cornell-Dubilier circa October 1993.
ALUMINUM ELECTROLYTIC CAPACITOR SHELF LIFE
The following time limits apply to shelf life at 35°C 60%RH for all
styles of CDE Aluminum Electrolytic capacitors:
|
 1Year
- |
Will meet initial
parameters. |
| 3
Years - |
Recommend testing
before use to determine if re-aging is required to meet initial
parameters of DCL (leakage). |
| 4
Years - |
Re-aging is usually
required before use. |
| 5
Years - |
Typically expect to
meet all parameters after re-aging. |
| 10
Years - |
Typically end of useful
shelf life, but subject to many variables. |
RE - AGING PROCEDURE
- This re-aging procedure is performed at room
temperature.
- Connect capacitor to a voltage source with a
resistor in series. 10K ohms for 75VDC and below. 100K ohms above
75VDC.
- Slowly increase voltage to the rated WVDC
while monitoring the charge current. Do not allow the charge current
to any individual unit to exceed 1mA.
- After reaching full voltage, continue to
apply full voltage for a minimum of 4 hours.
- Re-test DCL (leakage) after re-aging is
complete.
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Last Edited: 17 Oct 2005
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By: Mike Murphy, WA4BPJ
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