Datasheet

Engineering Draft
Guideline-ALTS-S1-2
Application Guidelines
Guidelines - 2
P a n a s o n i c C o r p o r a t i o n
Design, Specifications are subject to change without notice. Contact your nearest Panasonic sales office for the latest specifications prior
to purchase and/or use. Whenever any doubt about safety comes up with this product please contact us immediately for engineering
assistance without fail. Specifications are typical and may not apply to all applications.
1.3. Common Application Conditions to Avoid
The following misapplication load conditions will cause rapid deterioration of a capacitor's electrical parameters.
In addition, rapid heating and gas generation within the capacitor can occur, causing the pressure relief vent to operate and resultant
leakage of electrolyte. Under extreme conditions, explosion and fire ignition could result.
The leaked electrolyte is combustible and electrically conductive.
(1) Reverse Voltage
DC capacitors have polarity. Verify correct polarity before insertion. For circuits with changing or uncertain polarity, use DC
bipolar capacitors. DC bipolar capacitors are not suitable for use in AC circuits.
(2) Charge / Discharge Applications
Standard capacitors are not suitable for use in repeating charge/discharge applications. For charge/ discharge applications,
consult us with your actual application condition.
(3) ON-OFF circuit
Do not use capacitors in circuit where ON-OFF switching is repeated more than 10000 times/per day.
In case of applying to the theses ON-OFF circuit, consult with us about circuit condition and so on.
(4) Over voltage
Do not apply voltages exceeding the maximum specified rated voltage. Voltages up to the surge voltage rating are acceptable for
short periods of time.
Ensure that the sum of the DC voltage and the super-imposed AC ripple voltage does not exceed the rated voltage.
(5) Ripple Current
Do not apply ripple currents exceeding the maximum specified value. For high ripple current applications, use a capacitor
designed for high ripple currents. In addition, consult us if the applied ripple current is to be higher than the maximum specified
value. Ensure that rated ripple currents that superimposed on low DC bias voltages do not cause reverse voltage conditions.
1.4. Using Two or More Capacitors in Series or Parallel
(1) Capacitors Connected in Parallel
The circuit resistance can closely approximate the series resistance of the capacitor, causing an imbalance of ripple current loads
within the capacitors. Careful wiring methods can minimize the possible application of an excessive ripple current to a capacitor.
(2) Capacitors Connected in Series
Differences in normal DC leakage current among capacitors can cause voltage imbalances.
The use of voltage divider shunt resistors with consideration to leakage currents can prevent capacitor voltage imbalances.
1.5. Capacitor Mounting Considerations
(1) Double-Sided Circuit Boards
Avoid wiring pattern runs, which pass between the mounted capacitor and the circuit board. When dipping into a solder bath, an
excess solder may deposit under the capacitor by capillary action, causing short circuit between anode and cathode terminals.
(2) Circuit Board Hole Positioning
The vinyl sleeve of the capacitor can be damaged if solder passes through a lead hole into the subsequently processed parts.
Special care when locating hole positions in proximity to capacitors is recommended.
(3) Circuit Board Hole Spacing
The spacing of circuit board holes should match the lead wire spacing of capacitors within the specified tolerances.
Incorrect spacing can cause an excessive lead wire stress during the insertion process.
This may result in premature capacitor failure due to the short or open circuit, increased leakage current, or electrolyte leakage.
(4) Clearance for Case Mounted Pressure Relief
Capacitors with case mounted pressure relief require sufficient clearance to allow proper pressure relief operation.
The minimum clearances are dependent of capacitor diameters as follows.
Dia. 6 3 ~ Dia. 16 mm: 2 mm minimum, Dia. 18 ~ Dia. 35 mm: 3 mm minimum, Dia. 40 mm or greater: 5 mm minimum.
(5) Clearance for Seal Mounted Pressure Relief
Provide a hole on a circuit board to relieve gas when a pressure relief of a capacitor is situated underneath of the circuit board.
(6) Wiring Near the Pressure Relief
Avoid locating high voltage, high current wiring, or circuit board paths above the pressure relief.
Flammable, high temperature gas that exceeds 100 ˚C may be released and could dissolve the wire insulation and ignite.
(7) Circuit Board Patterns Under the Capacitor
Avoid circuit board runs underneath the capacitor, as an electrical short can occur due to an electrolyte leakage.
(8) Be careful for the sympathetic vibration after mounting on the board
The mechanical stress will make damage for its mounting strength and electrical characteristics.
Use reinforcement like an adhesive for The Snap-in type products when the capacitor is mounted horizontally on the vertical
positioned circuit board.
1.6. Electrical Isolation of the Capacitor
Completely isolate the capacitor as follows.
(1) Between the cathode and the case (except for axially leaded B types) and between the anode terminal and other circuit paths.
(2) Between the extra mounting terminals (on T types) and the anode terminal, cathode terminal, and other circuit paths.