Matters to Be Observed When Using This Product

■ Because the impedance of the capacitor is close to the circuit impedance, capacitors connected in parallel in the circuit

may damage the whole current balance, in which, a ripple current higher than the rated ripple current may flow in some of

the capacitors. To prevent concentration of ripple current on the low-impedance side, use capacitors with the same part

number and avoid the partiality of cable impedances. Do not use capacitors connected in series.

■ When the capacitor is mounted on a double-side wiring board, do not place the wiring pattern directly underneath where

the product is mounted. In case the electrolytic solution leaks out, it may short-circuit the pattern and cause tracking or

migration. Consider a case where the product is a radial lead capacitor and is mounted on a board with through-holes.

In this case, if the sealing part of the capacitor and the board surface stick close to each other, solder flows up to the

capacitor during a dip soldering process, which may cause short circuit between the anode and cathode of the capacitor.

In such a case, the outer laminate of the product may be damaged. The position of holes, therefore, must be

determined properly.

■ When designing a printed board carrying radial lead capacitors, make through-holes across the gap equal to the gap

between the leads (terminals) of the capacitor. If the gap between the through-holes is narrower or wider than the gap

between the leads, stress is applied to the leads when the capacitor is inserted in the holes.

This may result in increasing leak current, short circuit, wire breaking, or electrolytic solution leakage.

■ A capacitor which has the pressure valve on the case must be provided with a space formed above the pressure valve

so that the pressure valve operates without hinderance. When the product is 6.3 mm to 16 mm in diameter, form a

space of 2 mm or larger. When the product is 18 mm in diameter, form a space of 3 mm or larger.

If the space is not large enough, it will impair the operability of the pressure valve and may lead to an explosion

incident.

■ Design the circuit in such that the pattern, especially a line pattern carrying high voltage or large current, is not

formed above the pressure valve. Upon its activation, the pressure valve emits a flammable high-temperature gas

of over 100 ℃. This may cause a secondary accident, such as the gas condensing on the pattern and the wire

sheathing being melted and catching on fire.

■ Be careful with resonance of the capacitor mounted on the board. When a large load is applied to the capacitor at the

frequency close to the resonance frequency, it may cause the capacitor to come off or widely change its characteristics.

■ Completely isolate the case of the capacitor from the cathode terminal and the circuit pattern.

■ The laminate or outer sleeve covering of the product is for displaying information on the product and does not

have a guaranteed insulating function.

The laminate may turn brown under a high-temperature condition. However, that does not cause problems with

markings recognition on the product surface or electrical performance.

The outer sleeve may crack when dipped in a xylene or toluene solution and exposed to high temperature.

■ Do not reuse a capacitor that was incorporated in a circuit set and energized in the past. Do not use a capacitor that

was dropped on the floor.

Do not use a capacitor in its compressed form. Compressing the capacitor makes it less airtight, resulting in poor

performance, shorter guaranteed life, and electrolyte leakage.

■ A re-striking voltage is generated in a capacitor in some cases. In such a case, let the capacitor discharge through

a resistor of about 1 kΩ.

■ When a capacitor is kept in storage for a long period, you may find the leak current from the capacitor has increased.

In such a case, make voltage adjustment through a resistor of about 1 kΩ.

■ Before mounting the capacitor on the board, confirm the ratings (capacitance, rated voltage, etc.) and polarity of the

capacitor. Before mounting a surface-mounted type capacitor, confirm its terminal dimensions and land size.

Before mounting a radial lead type capacitor, confirm its terminal interval and hole interval. If the terminal interval is

not the specified one, stress is applied to internal elements, which may cause problems, such as a short circuit

and insufficient mounting strength.

When the terminal interval and the hole interval of the radial lead type capacitor do not match and therefore the

capacitor’s leads need to be readjusted, make sure that the readjustment does not apply any stress to the capacitor’s

body.

　

1-Dec-23

　Mounting conditions