Datasheet

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Apr. 1, 2008
APPROVAL
T.Kawamura
CHECK
T.Shinriki
DESIGN
A.Konishi
Note ;
CLASSIFICATION
SPECIFICATIONS
No.
SUBJECT
PAGE
DATE
151S-ECJ-SS018E
Multilayer Ceramic Chip Capacitor
Common S
p
ecification
(
Precautions for Use
)
Panasonic Electronic Devices Co., Ltd.
1. Precautions for Use
The Multilayer Ceramic Chip Capacitors (hereafter referred to as “Capacitors”) may fail in a short circuit mode in
an open-circuit mode when subjected to severe conditions of electrical, environmental and/or mechanical stress
beyond the specified “Rating and specified “Conditions” in the Specifications, resulting in burn out, flaming or
glowing in the worst case. The following “Precautions for Safety” and “Application Notes” shall be taken in your
major consideration for use.
2.
Operating Conditions and Circuit Design
2- 1.Circuit Design
2-1-1. Operating Temperature and Storage Temperature
The specified “Operating Temperature Range” in the Specifications is the absolute maximum and minimum
temperature rating. Every circuit mounting a Capacitor shall be operated within the specified “Operating
Temperature Range”. The Capacitors mounted on PCB shall be stored without operating within the specified
“Storage Temperature Range” in the Specifications.
2-1-2. Design of Voltage application
The Capacitors shall not be operated exceeding the specified “Rated Voltage” in the Specification.
If voltage ratings are exceeded, the Capacitors could result in failure or damage. In case of application of DC
and AC voltages to the Capacitors, the designed peak voltage shall be within the specified “Rated Voltage”.
In case of AC of pulse voltage, the peak voltage shall be within the specified “Rated Voltage”. If high frequency
voltage or fast rising pulse voltage is applied continuously even within the “Rated Voltage”, contact our
engineering section before use. Such continuous application affects the life of the Capacitors.
2-1-3. Working Current
It is recommended to equip the Capacitors with protection circuits for safety reasons, as should the Capacitors
short circuit with voltages such as secondary voltage, there will be a serious risk that the Capacitors might
self-heat or circuit boards might burn out.
2-1-4. Self-Heating of Capacitors
When the Capacitors self-heat as a result of using AC or pulse voltage circuits and operate at room
temperatures (25deg.C max.), make sure that the Capacitors’ surface temperature does not exceed the ambient
temperature plus 20 deg.C (max.), or the maximum operating temperature specified in product specification for
approval. Also, the temperature of the Capacitors’ surface which varies with circuit types used should be
measured under the operational mode of devices mounted on by the Capacitors.
2-1-5. Restriction on Environmental Conditions
The Capacitors shall not be operated and / or stored under the following environmental conditions.
(1) Environmental conditions
(a) To be exposed directly to water or salt water
(b) To be dew formation
(c) Under conditions of corrosive gases such as hydrogen sulfide, sulfurous acid, chlorine and ammonia
(2) Under severe conditions of vibration or impact beyond the specified conditions in the Specifications
2-1-6. DC voltage characteristics
The capacitance of Class 2 Capacitors has voltage dependency, contributing to big capacitance fluctuations in
high DC voltage application. To secure specified capacitance, the following should be confirmed.
(1) That the capacitance fluctuations caused by voltage application are within the capacitance range of a circuit
used, or if the capacitance range of a circuit used is broad enough to maintain the Capacitors’ functions.
(2) DC voltage characteristics demonstrate, even if applied voltage is under the rated voltage, capacitance
change rate increases with higher voltage (Capacitance down). Accordingly, when the Capacitors are used
for circuits with narrow capacitance allowable range such as time constant circuits, we recommend to apply
lower voltage upon due consideration on capacitance aging in addition to the above.
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