CONDUCTIVE POLYMER HYBRID ALUMINUM ELECTROLYTIC CAPACITORS

Lifetime Estimation of Conductive Polymer Hybrid Aluminum Electrolytic Capacitors
Subject series : HXC/HXD/HXJ/HXE/HSC/HSD/HSE
Please consult us about lifetime equations for HXF series.
Conductive polymer hybrid aluminum electrolytic capacitors, in common with other aluminum electrolytic capacitors, are electroniccomponents with a finite lifespan. The lifetime of these capacitors is influenced by ambient temperatures, environmental conditions
such as humidity, and operating conditions such as the level of ripple current and surge voltage, all of which can reduce capacitanceand increase ESR as a result.

1. Lifetime Estimation
Estimation of lifetime can be expressed by the following equations (1) to (3), which take the effects of ambient temperatures and selfheat rise resulting from ripple current into account.
Subject series : HXC/HXD/HXJ/HSC/HSD

Lx=Lr×Bt

Kt(To－Tx)
10×Bt

ΔTo－ΔT
10・・・・・・・・・・・・・・・・・・・・・・・・(1)

Subject series : HXE/HSE125 ℃<Tx≦135 ℃
To－Tx

Lx=Lr×Bt 10 ×Bt

ΔTo－ΔT
10・・・・・・・・・・・・・・・・・・・・・・・・・・・(2)Tx≦125 ℃

Lx=Lr×Bt

Kt(125－Tx)
10×Bt

ΔTo－ΔT
10・・・・・・・・・・・・・・・・・・・・・・・(3)：Estimation of actual lifetime (hour): Stated lifetime under the rated ripple current superimposition at the upper limit of the category temperature (hours)：Temperature acceleration factor ……（Table-1）：Correction factor of ambient temperature acceleration factor……（Table-2）：Maximum category temperature (℃)：Actual ambient temperature of the capacitor (℃)
Use 40℃ if the actual ambient temperature is below it.
ΔTo ：Rise of internal temperature due to the rated ripple current (℃) ……（Table-3）
ΔT ：Rise of internal temperature due to actual ripple current (℃)
Lx
Lr
Bt
Kt
To
Tx

Table-1

Bt：Temperature acceleration factor
Subject series
HXC/HXD/HXJ/HSC/HSD
Tx ≦ 125 ℃
HXE/HSE
125 ℃ < Tx ≦ 135 ℃

Table-2

φ8, 1022
1.7

Kt：Correction factor of ambient temperature acceleration factor
Actual ambient temperature of the capacitor
Bt=1.7
Bt=2

Table-3

φ5, 6.3
1.7
1.71.7Tx ≦ 65 ℃
1.06

65 ℃ < Tx ≦ 105 ℃ 105 ℃ < Tx ≦ 125 ℃
1.03
1
1

ΔTo：Rise in internal temperature due to the rated ripple current (℃)
Subject series
HXC
Case size
φ6.3×5.8 to φ10×10L φ10×12.5L
5℃
6℃
ΔTo
Subject series
Case size
ΔTo

HSC
―
5℃

HXE
φ6.3×5.8L to φ10×10L、φ10×16.5L
15℃ (Tx≦125 ℃)
5℃ (125 ℃<Tx≦135 ℃)

HXD/HSD
HXJ―
φ6.3x5.8L φ6.3x7.7L φ8×10L, Φ10×10L φ10×12.5L
15℃
5℃
8℃
10℃
11℃

φ10×12.5L
16℃ (Tx≦125 ℃)
6℃ (125 ℃<Tx≦135 ℃)

HSE―15℃ (Tx≦125 ℃)
5℃ (125 ℃<Tx≦135 ℃)

An approximate value of ripple current-caused ΔT can be calculated using Equation (4)（ ）ΔT=ΔTo×Ix
Io2

・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・(4)

ΔTo：Rise in internal temperature due to the rated ripple current ……（Table-3）
Ix ：Operating ripple current (Arms) actually ﬂowing in the capacitor
Io ：Rated ripple current (Arms), frequency compensated, at the upper limit of the category temperature range
To determine more accurate values of ΔT, they can be actually measured using a thermocouple.

Product specifications in this catalog are subject to change without notice.Request our product specifications before purchase and/or use. Please use our products based on the information contained in this catalog and product specifications.

CAT. No. E1001Y 2024

CONDUCTIVE POLYMER HYBRID ALUMINUM ELECTROLYTIC CAPACITORS
2. Rated Ripple Current Frequency Multipliers
Self-heat rise is generated by the ripple current even though the conductive polymer hybrid aluminum electrolytic capacitors have
low ESR compared to liquid based electrolyte aluminum electrolytic capacitor. The ESR value differs depending on the frequency,
thus the degree of self-heat rise differs depending on the ripple current frequency. Therefore, if the actual ripple current frequency
differs from the specifications stated in the standard ratings, use the value obtained by multiplying the rated ripple current multiplier
to convert the rated current.
Conductive polymer hybrid aluminum electrolytic capacitors have super low ESR characteristic in high-frequency range. On thewhole, ESR in low-frequency range relatively rises. Therefore, they can use only small ripple current in low-frequency range.
Please ensure that excessive ripple current is not applied to the capacitors in all frequency range.

3. Restriction of estimated lifetime calculation
The result calculated by the estimated lifetime formula, it is not guaranteed lifetime by Nippon Chemi-Con Corporation.
When designer calculate the lifetime of apparatus, please include an ample margin in consideration to the estimated lifetime of acapacitor.
When calculated lifetime result are over 15 years by using the estimated lifetime formula, please consider 15 years to be a maximum
in considering that the sealing rubber characteristics vary during the lifetime.
If 15 years or more may be required as an expected lifetime, please consult us.

Product specifications in this catalog are subject to change without notice.Request our product specifications before purchase and/or use. Please use our products based on the information contained in this catalog and product specifications.

CAT. No. E1001Y 2024