PRECAUTIONS AND GUIDELINES FOR USERS
a) The electrical characteristics of capacitors vary in respect
to temperature, frequency and service life. Design the de-
vice circuits by taking these changes into account.
b) Capacitors mounted in parallel need the current to flow
equally through the individual capacitors.
c) Capacitors mounted in series require resistors in parallel
with the individual capacitors to balance the voltage.
a) Used capacitors are not reusable, except in the case that the
capacitors are detached from a device for periodic inspec-
tion to measure their electrical characteristics.
b) If the capacitors have self charged, discharge in the capaci-
tors through a resistor of approximately 1kO before use.
c) If capacitors are stored at a temperature of 35C or more and
more than 75%RH, the leakage current may increase. In this
case, they can be reformed by applying the rated voltage
through a resistor of approximately 1kO.
d) Verify the rated capacitance and voltages of the capacitors
when installing.
f ) Verify the polarity of the capacitors.
g) Do not use the capacitors if they have been dropped on the floor .
h) Do not deform the cases of capacitors.
g) V erify that the lead spacing of the capacitor fits the hole spac-
ing in the PC board before installing the capacitors. Some
standard pre-formed leads are available.
h) For pin terminals or snap-in terminals, insert the terminals into
PC board and press the capacitor downward until the bottom of
the capacitor body reaches PC board surface.
i ) Do not apply any mechanical force in excess of the limits
prescribed in the catalogs or the product specifications of
the capacitors.
Also, note the capacitors may be damaged by mechanical
shocks caused by the vacuum/insertion head, component
checker or centering operation of an automatic mounting or
insertion machine.
a) When soldering with a soldering iron
· Soldering conditions (temperature and time) should be within
the limits prescribed in the catalogs or the product specifi-
cations.
· If the terminal spacing of a capacitor does not fit the termi-
nal hole spacing of the PC board, reform the terminals in a
manner to minimize a mechanical stress into the body of
the capacitor.
· Remove the capacitors from the PC board, after the solder
is completely melted, reworking by using a soldering iron
minimizes the mechanical stress to the capacitors.
· Do not touch the capacitor body with the hot tip of the sol-
dering iron.
b) Flow soldering
· Do not dip the body of a capacitor into the solder bath only
dip the terminals in. The soldering must be done on the
reverse side of PC board.
· Soldering conditions (preheat, solder temperature and dip-
ping time) should be within the limits prescribed in the cata-
logs or the product specifications.
· Do not apply flux to any part of capacitors other than their
terminals.
· Make sure the capacitors do not come into contact with any
other components while soldering
c) Reflow soldering
· Soldering conditions (preheat, solder temperature and dip-
ping time) should be within the limits prescribed in the cata-
logs or the product specifications.
· When setting the temperature infrared heaters, consider
that the infrared absorption causes material to be discol-
ored and change in appearance.
· Do not solder capacitors more than once using reflow. If
you need to twice, be sure to consult us.
· Make sure capacitors do not come into contact with copper
traces.
d) Do not re-use surface mount capacitors which have already
been soldered.
In addition, when installing a new capacitor onto the assem-
bly board to rework, remove old residual flux from the sur-
face of the PC board, and then use a soldering iron within
the prescribed conditions.
Do not apply any mechanical stress to the capacitor after
soldering onto the PC board.
a) Do not lean or twist the body of the capacitor after solder-
ing the capacitors onto the PC board.
b) Do not use the capacitors for lifting or carrying the assembly
board.
c) Do not hit or poke the capacitor after soldering to PC board.
When stacking the assembly board, be careful that other com-
ponents do not touch the aluminum electrolytic capacitors.
d) Do not drop the assembly board.
a) Do not wash capacitors by using the following cleaning agents.
Solvent-proof capacitors are only suitable for washing using
the cleaning conditions prescribed in the catalogs or the prod-
uct specifications. In particular, ultrasonic cleaning will ac-
celerate damaging capacitors.
· Halogenated solvents; cause capacitors to fail due to cor-
rosion.
· Alkali system solvents; corrode (dissolve) an aluminum
case.
· Petroleum system solvents; cause the rubber seal mate-
rial to deteriorate.
· Xylene; causes the rubber seal material to deteriorate.
· Acetone; erases the marking.
b) Verify the following points when washing capacitors.
· Monitor conductivity, pH, specific gravity, and the water
content of cleaning agents. Contamination adversely af-
fects these characteristics.
· Be sure not to expose the capacitors under solvent rich
conditions or keep capacitors inside a closed container.
In addition, please dry the solvent sufficiently on the PC
board and the capacitor with an air knife (temperature
should be less than the maximum operating temperature
of the capacitor) over 10 minutes.
Aluminum electrolytic capacitors can be characteristically
and catastrophically damaged by halogen ions, particu-
larly by chlorine ions, though the degree of the damage
mainly depends upon the characteristics of the electro-
lyte and rubber seal material. When halogen ions come
into contact with the capacitors, the foil corrodes when
voltages applied. This corrsion causes ; extremely high
leakage current, which causes in line with, venting, and
an open circuit.
Global environmental warnings (Greenhouse effects and
other environmental destruction by depletion of the ozone
layer), new types of cleaning agents have been devel-
oped and commercialized as substitutes for CFC-
113,1,1,2-trichloroethlene and 1,1,1-trichloroethylene.
The following are recommended as cleaning conditions
for some of new cleaning agents.
Installing Capacitors
Cleaning PC board
Handling after soldering
Others
Installing
Soldering and Solderability
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3
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CAT. No. 12