Datasheet

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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
5
KEMET Organic Capacitor (KO-CAP
®
)
T52x/T530 Polymer Electrolytic Capacitors
Reliability
KO-CAP capacitors have an average failure rate of 0.5 %/1,000 hours at category voltage, U
C
, and category temperature,
T
C
. These capacitors are qualied using industry test standards at U
C
and T
C
. The minimum test time (1,000 hours or 2,000
hours) is dependent on the product.
The actual life expectancy of KO-CAP capacitors increases when application voltage, U
A
, and application temperature, T
A
,
are lower than U
C
and T
C
. As a general guideline, when U
A
< 0.9 * U
C
and T
A
< 85°C, the life expectancy will typically exceed
the useful lifetime of most hardware (> 10 years).
The lifetime of a KO-CAP capacitor at a specic application voltage and temperature can be modeled using the equations
below. A failure is dened as passing enough current to blow a 1-amp fuse. The calculation is an estimation based on
empirical results and is not a guarantee.
TAF = e
[ ( )]
E
a
k
1
273+T
A
1
273+T
C
TAF = acceleration factor due to temperature, unitless
where:
E
a
= activation energy, 1.4 eV
k = Boltzmann’s constant, 8.617E-5 eV/K
T
A
= application temperature, °C
T
C
= category temperature, °C
VAF =
( )
U
C
U
A
n
VAF = acceleration factor due to voltage, unitless
where:
U
C
= category voltage, volt
U
A
= application voltage, volt
n = exponent, 16
AF = VAF * TAF
AF = acceleration factor, unitless
where:
TAF = accerlation factor due to temperature, unitless
VAF = acceleration factor due to voltage, unitless
* AFLife
U
A
,T
A
= Life
U
C
,T
C
Life
UA, TA
= guaranteed life application voltage
and temperature, years
where:
AF = acceleration factor, unitless
Life
UC, TC
= guaranteed life category voltage
and temperature, years
Terms:
Category voltage, U
C
: maximum recommended peak DC operating voltage for continuous operation at the category temperature, T
C
Rated voltage, U
R
: maximum recommended peak DC operating voltage for continuous operation up to the rated temperature, T
R
Category temperature, T
C
: maximum recommended operating temperature. Voltage derating may be required at T
C
Rated temperature, T
R
: maximum recommended operating temperature without voltage derating. T
R
is equal to or lower than T
C
Reliability Table 1 – Common temperature range classications
85°C (T
R
) /
85°C (T
C
)
Rated Voltage (U
R
)
2.5 4.0 6.3 8.0 10.0 12.5 16.0 20.0 25.0 35.0 50.0 63.0 75.0
Category Voltage (U
C
)
2.5 4.0 6.3 8.0 10.0 12.5 16.0 20.0 25.0 35.0 50.0 63.0 75.0
105°C (T
R
) /
105°C (T
C
)
Rated Voltage (T
R
)
2.5 4.0 6.3 8.0 10.0 12.5 16.0 20.0 25.0 35.0 50.0 63.0 75.0
Category Voltage (U
C
)
2.5 4.0 6.3 8.0 10.0 12.5 16.0 20.0 25.0 35.0 50.0 63.0 75.0
105°C (T
R
) /
125°C (T
C
)
Rated Voltage (T
R
)
2.5 4.0 6.3 8.0 10.0 12.5 16.0 20.0 25.0 35.0 50.0 63.0 75.0
Category Voltage (U
C
)
1.7 2.7 4.2 5.4 6.7 8.4 10.7 13.4 16.8 23.5 33.5 42.2 50.3