Polymer Guide
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Vishay
Revision: 21-Apr-17
10
Document Number: 40076
For technical questions, contact: polytech@vishay.com
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GUIDE TO APPLICATION
1. AC Ripple Current: the maximum allowable ripple
current shall be determined from the formula:
where,
P = power dissipation in W at +45 °C as given in
the tables in the product datasheets.
R
ESR
= the capacitor equivalent series resistance at
the specified frequency.
2. AC Ripple Voltage: the maximum allowable ripple
voltage shall be determined from the formula:
or, from the formula:
where,
P = power dissipation in W at +45 °C as given in
the tables in the product datasheets.
R
ESR
= The capacitor equivalent series resistance at
the specified frequency.
Z = The capacitor impedance at the specified
frequency.
2.1 The tantalum capacitors must be used in such a
condition that the sum of the working voltage and
ripple voltage peak values does not exceed the rated
voltage as shown in figure below.
3. Temperature Derating: power dissipation is
affected by the heat sinking capability of the
mounting surface. If these capacitors are to
be operated at temperatures above +45 °C, the
permissible ripple current (or voltage) shall be
calculated using the derating coefficient as shown in
the table below:
4. Reverse Voltage: the capacitors are not intended for
use with reverse voltage applied. However, they are
capable of withstanding momentary reverse voltage
peaks, which must not exceed the following values:
At 25 °C: 10 % of the rated voltage or 1 V, whichever
is smaller.
At 85 °C: 5 % of the rated voltage or 0.5 V, whichever
is smaller.
At 105 °C: 3 % of the rated voltage or 0.3 V,
whichever is smaller.
5. Mounting Precautions:
5.1 Limit Pressure on Capacitor Installation with
Mounter: pressure must not exceed 4.9 N with a tool
end diameter of 1.5 mm when applied to the
capacitors using an absorber, centering tweezers, or
similar (maximum permitted pressurization time: 5 s).
An excessively low absorber setting position would
result in not only the application of undue force to the
capacitors but capacitor and other component
scattering, circuit board wiring breakage, and / or
cracking as well, particularly when the capacitors are
mounted together with other chips having a height of
1 mm or less.
5.2 Flux Selection
5.2.1 Select a flux that contains a minimum of chlorine and
amine.
5.2.2 After flux use, the chlorine and amine in the flux
remain must be removed.
5.3 Cleaning After Mounting: the following solvents are
usable when cleaning the capacitors after mounting.
Never use a highly active solvent.
• Halogen organic solvent (HCFC225, etc.)
• Alcoholic solvent (IPA, ethanol, etc.)
• Petroleum solvent, alkali saponifying agent, water,
etc.
Circuit board cleaning must be conducted at a
temperature of not higher than 50 °C and for an
immersion time of not longer than 30 minutes. When
an ultrasonic cleaning method is used, cleaning must
be conducted at a frequency of 48 kHz or lower, at
an vibrator output of 0.02 W/cm
3
, at a temperature of
not higher than 40 °C, and for a time of 5 minutes or
shorter.
Notes
• Care must be exercised in cleaning process so that the
mounted capacitor will not come into contact with any
cleaned object or the like or will not get rubbed by a stiff
brush or similar. If such precautions are not taken
particularly when the ultrasonic cleaning method is
employed, terminal breakage may occur.
• When performing ultrasonic cleaning under conditions
other than stated above, conduct adequate advance
checkout.
MAXIMUM RIPPLE CURRENT TEMPERATURE
DERATING FACTOR
45 °C 1.0
55 °C 0.8
85 °C 0.6
105 °C 0.4
I
RMS
P
R
ESR
------------=
V
RMS
Z
P
R
ESR
------------=
Voltage
Rated voltage
Ripple voltage
Operating
voltage
Working voltage
Time (s)
