Matters to Be Observed When Using This Product

■ The product life is given by the following equation.

L2 = L1 x 2

Where T1 ≧ T2

L1 : Guaranteed life (h) at temperature T1 (

℃)

L2 : Expected life (h) at temperature T2 (

℃)

* In the case of a hybrid type, category temperature (

℃)

T1 : Upper category temperature (

℃)

+ temperature increase caused by rated ripple current (

℃)

T2 : Ambient temperature of capacitor (

℃)

⊿T : Temperature increase caused by ripple current (

℃)

■ Do not use the product for a period longer than its specified service life. A capacitor with its service life ended may

cause the following problems: rapid degradation of the product characteristics, short circuit, unnecessary activation of

the pressure valve, electrolytic solution leakage, etc. Note that the estimated service life is not longer than 15 years due

to the limited environment-resistant property of the sealing rubber.

■ When the capacitor is used under a high-temperature condition for a long period, minute cracks develop on the surface

of the sealing rubber or the case surface turns brown in some cases. These phenomena, however, have no effects on

the reliability of the capacitor.

■ A capacitor conforming to "AEC-Q200" refers to a capacitor having passed some or all of evaluation test items defined

in AEC-Q200.

To know the detailed specifications of each capacitor or specific evaluation test scores, please contact us.

We issue a delivery specification sheet for each product ordered. Please confirm the delivery specification sheet when

you place an order with us.

■ The electrical characteristics change as a result of temperature/frequency fluctuations. Take electrical characteristic

changes into consideration when working out a circuit design.

(1) Temperature fluctuations

High-temperature condition

: increase in leak current

Low-temperature condition

: decrease in the capacitance, increase in the tangent to the loss angle,

increase in the impedance (the hybrid type is excluded), etc.

(2) Frequency fluctuations

High-frequency condition

: decrease in the capacitance, increase in the tangent to the loss angle,

decrease in the impedance, etc.

Low-frequency condition

: more heat generation by ripple current as a result of an increase in the

equivalent series resistance

■ The group of factors described below may lead to rapid degradation of the capacitor characteristics, short circuit, or

electrolytic solution leakage. They may give rise to sharp heat/gas generation, too, in which case the increasing internal

pressure actuates the pressure valve, causes the electrolytic solution to leak out of the sealing part, and, in a worst-case

scenario, causes an explosion or ignition incident. When a capacitor bursts, it may scatter flammable materials

(electrolytic solution, etc.) in its surroundings.

(1) Reverse voltage: The capacitor has preset polarity. Do not apply a reverse voltage to the capacitor.

Confirm the polarity indicated on the capacitor and then use it.

(2) Charge/discharge: Avoid using the capacitor in a circuit that frequently repeats sharp charge/discharge cycles or a

circuit that requires

　relatively slow but highly frequent charge/discharge cycles. In cases where you use the capacitor

in such circuits, make sure to inform us of the charge/discharge conditions.

Ensure that a rush current does not exceed 100 A.

(3) ON/OFF: Avoid using the capacitor in an on/off circuit that repeatedly switches on and off more than 10,000 times a

day. In cases where you use the product in such circuits, make sure to inform us of the circuit conditions, etc.

(4) Overvoltage: Do not apply an overvoltage higher than the rated voltage (higher than the surge voltage when the

voltage application period is short). A peak value given by superposing a ripple voltage (AC component) on a DC

voltage must be equal to or lower than the rated voltage.

(5) Ripple current: Do not allow an excessively large ripple current (larger than the rated ripple current specified in the

specifications) to flow through the capacitor. Even if a ripple current flow in the capacitor is equal to or smaller than the

rated ripple current, a low DC bias voltage may generate a reverse voltage flow in the capacitor. Keep the ripple current

flow within a range in which no reverse voltage is generated.

Even if the ripple current flow is kept equal to or smaller than the rated ripple current, using the capacitor for a period

longer than its service life intensifies the degradation of the ESR characteristics, resulting in an increase in internal

heating caused by the ripple current. As a result, the pressure valve is actuated, the exterior case or rubber swells,

the electrolytic solution leaks, and, in a worst-case scenario, the capacitor short-circuits and ignites or explodes.

30-Jun-23

　Circuit design and circuit board design

T1-(T2+⊿T)

10