CD269LHL Datasheet, PDF (5/7 Pages) Jianghai Europe GmbH – 4 000 - 10 000h at 125°C

Life Time Estimation
Lifetime Estimation of Aluminum Electrolytic Capacitors from Jianghai
To estimate the Lifetime of a non-solid Aluminum Electrolytic Capacitor from Jianghai, the following formulas can be utilized. The
Lifetime depends mainly on the ambient temperature, the ripple current and, within certain limits, the operating voltage applied.
Other parameters may also affect the Lifetime. Moreover, L₀ can be interpreted in many different ways, which has a fundamental
influence on the numerical result. Jianghai offers a high transparency by publishing the different typical definitions of Lifetimes in
each datasheet. Lifetime estimations are approximations by nature.
Please let JIANGHAI EUROPE confirm any result before using it. The formulas given here do not constitute part of a contract nor
of a specification. The formulas do not cover additional aging effects of certain electrolytic systems or other chemical effects. Please
contact us should you need Lifetime estimates for Solid Electrolyte Polymer Capacitors. Also the dimensions of the components
may have an effect. Forced cooling or other additional cooling-methods have a strong impact on the Lifetime and are not covered
by the formulas.
For the estimation and interpretation of Lifetime, a close collaboration with JIANGHAI EUROPE is strongly advised.
Structural formula:
L = L₀ · K_T · K_R · K_V
Where:
L
L₀

K_T
K_R
K_V
Total Lifetime
Lifetime under Rated Ripple Current at Upper
Category Temperature (see catalogue)
Temperature Factor
Ripple Current Factor
Voltage Factor
1. K_T Temperature Factor:
Aluminum Electrolytic Capacitors follow roughly the 10 K rule of Arrhenius. It is possible to estimate the
Lifetime by rule of thumb: When the operational temperature is reduced by 10 K, the Lifetime will double.
The formula for K_T in detail is:
T₀ - T_A
K_T = 2 ^10K
Where:
T₀ Rated Temperature
T_A Ambient Temperature, Upper Category Temperature
2. K_R Ripple Current Factor: The influence of ripple current on Lifetime can be estimated according to
the following formula:
A
K_R = K_i
∆ T₀
10K
With:
( ) ^{A = 1 –}
I_A
I_R
2
Where:
I_A Actual Rated Ripple Current
I_R Ripple Current at Upper Category Temperature (databook value)
ΔT₀ Core Temperature Rise of the capacitor
(typically 5K for T₀ = 105°C and 10K for T₀ = 85°C)
K_i Basis, defined as

T₀ = 105°C
I_A > I_R: K_i = 4

I_A ≤ I_R: K_i = 2
T₀ = 85°C
K_i = 2
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