Rev. 7

Conductive Polymer Aluminum

Solid Capacitor (Radial Type)

MERITEK

PEEP Series

d. Repeat of rapid charging and discharging

If PEHA series is used in a rapid charging and discharging circuit or receive the flow of excess rush current, its

life may shorten by large leakage current or short circuit. The charging and discharging current through PEHA

series should be less than 10A.

e. Soldering

Capacitors should be soldered under the soldering conditions defined in the delivery specifications. Some

improper soldering condition may cause the leakage current of capacitors to increase or other parameters to

change.

f. Use of capacitors for industrial equipment

When capacitors are used for industrial equipment, the circuits should be designed to have sufficient margins

in the ratings of capacitors including capacitance and impedance. Without sufficient margins in the

characteristics, the reliability of the capacitors may be reduced by their shorter life. Always contact us if you

want to use capacitors for equipment affecting human lives such as space, aviation, atomic power, and

medical devices. Never use capacitors for the used without our prior approval.

2. Notes on circuit designs for capacitors

a. Rating and Performance

Use capacitors within the rating and performance ranges defined in the brochures and delivery specification of

capacitors after checking the operating and installation environments.

b. Operating temperature

If PEHA series is used at a temperature higher than the upper specified temperature (105

⁰C), its life may be

remarkably shortened or the leakage current may increase to cause defective.

c. Ripple current

Never make current larger than the rated ripple current through PEHA series. If excess ripple current flows

through PEHA series, internal heat may be generated largely to make its life shortened or cause it to be

defected due to short circuit.

d. Leakage current

Depending on the soldering conditions, the leakage current of PEHA series may increase slightly. The

application of DC voltage enables the capacitors to be repaired by itself. This leads the leakage current to be

smaller gradually. The leakage current can be reduced fast if the DC voltage, which is less than the rating

voltage, is applied at the temperature close to the upper specified temperature.

e. Applied voltage

(1) To secure the reliability of capacitors, it is recommended that the voltage applied to them should be less

than 80% of the rated voltage.

(2) The peak value of the ripple voltage superimposed with the DC voltage should be less than rated voltage.

f. Failure mode

PEHA series contains a conductive polymer as material of cathode electrode. Therefore, like other solid

electrolyte capacitors, the life ends mostly due to random failure mode, mainly short circuit. If a current

continuously flow through the capacitor due to short circuit, the capacitor would be overheated higher than

300

⁰C and then aluminum case of the capacitor would be removed by increasing internal pressure due to the

vaporization of materials.

g. Insulation

(1) Plastic coated case of capacitors is not secured to insulate. Do not use capacitors in PEHAs requiring

insulation.

(2) Isolate the case of PEHA series from the positive and negative terminals and adjacent circuit patterns.

h. Design of printed circuit board

Take note on the following subjects when capacitors are installed on printed circuit boards:

(1) Verify that the lead spacing fit hole pitches on printed circuit board.

(2) Do not place heating components on boards to be close to capacitors or in the backside of them.

(3) If capacitors are mounted on a double-sided PC board, design the board so that extra or through holes

may not be opened below them.