Datasheet

Precautions in using Tantalum
Capacitors
The operational attentions to the use of the tantalum
capacitors are as follows:
•
Electrical
•
Environmental
•
Conditions for mounting on equipment and circuit boards
•
Mechanical vibration, shock
If the tantalum capacitors are used without satisfying any one
of these conditions, the probability of short-circuiting, current
leakage or other problems to occur increases. To avoid such
problems, observe the following precautions when using the
tantalum capacitors.
Correct Use
[Guality grades]
Samsung devices are classified into the following quality grades in
accordance with their applications. The quality grade of all devices
in this document is "standard"; the devices in this document cannot
be used for "special" or "specific" quality grade applications.
Customers who intend to use a product or products in this document
for applications other than those specified under the"standard"
quality grade must contact Samsung sales representative in advance.
Standard: This quality grade is intended for applications in which
failure of malfunction of the device is highly unlikely to cause harm to
persons or damage to property, or be the source of any negative
effects or problems in the wider community.
Special: This quality grade is intended for special applications that have
common requirements, such specifi industrial fields. Devices with a
"special" quality grade are designed, manufactured, and tested
using a more stringent quality assurance program than that
used for "stardard" grade devices. There is a high possibility that
failure or malfunction of the device when used for applications in this
category will cause harm to persons or damage to property, or create
negative effects or problems in the wider community.
Specific: Devices with a "specific" quality grade are designed,
manufactured, and tested using a quality assurance program that is
designed by the customer or that is created in accordance with the
customer's specifications. There is an extremely high possibility that
failure of malfunction of the device when being used for applications
in the wider community. Customers who use Samsung's products
for these "specific"application must conclude an individual quality
agreement and / or development agreement with Samsung.
A quality assurance program designated by the customer must also
be determined in advance
[Cautions]
Samsung devices are classified into the following three quality
grades:"Standard," "Special," and "Specific."
The Specific quality grade applies only to devices developed based on
a customer-designated quality assurance program for a specific
application.
The recommended applications of a device depend on its quality grade,
as indicated below.
Customers must check the quality grade of each device before using
it in a particular application.
Standard: Computers, office equipment, communications equipment,
test and measurement equipment, audio and visual equipment, home
electronic appliances, machine tools, personal electronic equipment,
and industrial robots
Special : Transportation equipment(automobiles, trains, ships, etc.),
traffic control systems, anti-disaster systems, anti-crime systems,
safety equipment, and medical equipment
(not specifically designed for life support)
※
Low-impedance circuits
Power supply filter Power supply bypass
Power
supply
circuit
Fig. 1 Fig. 2
IC
~
+
-
+
-
+
+
Specific: Aircraft, aerospace equipment, submersible
repeaters, nuclear reactor control systems, life support
systems, or medical equipment for life support, etc.
The quality grade of Samsung devices is "Standard" unless
otherwise specified in Samsung's data sheets or data books.
if customers intend to use Samsung devices for applications
other than those specified for Standard quality grade, they
should contact an Samsung sales representative in advance.
Operational Attentions
Circuit designing cautions
[Manganese dioxide type]
Low voltage application or High resistance connected to the
capacitor in series
A problem could possibly result if the following application
exists:
Low voltage, high resistance connected to the capacitor in
series, and a circuit sensitive to leakage
current. A problem could occur due to the lower recovery of
the leakage current characteristic of
tantalum capacitor, caused by heat stress during the soldering
process.
[Polymer type]
Prohibited circuits
Since problems can be expected, polymer products cannot be
used on the following circuits.
1) High impedance voltage retention circuits
2) Coupling circuits
3) Time constant circuits
4) Circuits greatly affected by leakage current
5) The circuit in which two or more samsung polymer
products are connected in a series so as to raise the
endurance voltage
1. Operating Voltage
1) The voltage derating factor should be as great
as possible.
Under normal conditions, the operating voltage should be
reduced to 50% or less of the rating. It is recommended
that the operating voltage be 30% or less of the rating,
particularly when the tantalum capacitors are used in
a low-impedance circuit(see Figs. 1, 2, and 3).
2) For circuits in which a switching, charging, discharging,
or other momentary current flows, it is recommended
that the operating voltage be 30% or less of the rating,
with a resistor connected in series to limit the current
to 300 mA or less.
3) When the tantalum capacitors are to be used at an
ambient temperature of higher than 85℃,
the recommended operating range shown in Fig.
3 should not be exceeded