Supercapacitor (EDLC) Application Note for PLC
No. C2M1CXS-149A
Maintenance Free Backup System
1.
Application
-No need for battery replacement3.
 Long life
Much longer life than Primary Lithium battery
(15 years at 70 deg.C)
 High Power
High allowable current/power
Suitable for high power short time backup
 Small and Slim package
Suitable for slim or thin devices
Factory automation equipment, such as PLC (programmable logic
controller), which uses lithium ion primary batteries or other
primary batteries for memory backup.
2.
Features of Murata’s Supercapacitor
Solution
Data evacuating backup system
A primary battery is often used for backing up power supply for
volatile memory（memory protection backup system）. Data in
volatile memory, however, can disappear when backup time
becomes long and battery is wasted.
For this reason, Murata offers data evacuating backup solution
using a supercapacitor (EDLC). In the event of power failure, the
supercapacitor provides enough power to write any data in transit
down from volatile to non-volatile memory. This system can
considerably reduce the risk of losing data. (Please refer to block
circuit diagram #5).
① Maintenance free
<Constant power discharge of DMT334R2S474M3DTA0>
In the memory protection backup system, battery replacement
is needed when battery is wasted or at the time of periodic
maintenance. In the data evacuating backup system, there is no
need for maintenance because a primary battery is not in use.
② Battery less
No battery is used in the data evacuating backup system. There
is no risk of battery error and the trouble that accompanies it.
Murata’s supercapaciotor has been well received and adopted
by industrial equipments manufacturers.
Safety standard UL810A listed products
4.
Product
Series
③ Improve data reliability
Data evacuating backup system can considerably reduce the
risk of missing data, unlike memory protection backup system, at
the time of battery run-out or battery replacement. As a result,
you can get higher data reliability.
④ Space saving
Because mechanical design for battery replacement is not
needed, package can be simplified and save space. Saved space
can be effectively used for other purposes, such as adding
another device or interface.
5.
RoHS
Part Number
General Purpose
Type
DMT
REACH
Rated Cap. ESR
Voltage [mF] [mohm]
LxW
[mm]
t
[mm]
220
300
21 x 14
2.2
(2.5Max)
470
130
21 x 14
3.5
(3.8Max)
DMT3N4R2U224M3DTA0
4.2V
DMT334R2S474M3DTA0
Hand
Soldering
Only
5.
Technical Support
Sample: Please contact Murata Sales or Distributor.
Design support：Please access our website for more information.
http://www.murata.com/en-global/products/capacitor/edlc
- C2M1CXS-053 Murata Supercapacitor Technical note
If you have any questions, please contact your local
Murata Sales Representative.
Block Circuit Diagrams
< Memory Protection Backup System (Conventional Way) >
< Data Evacuating Backup System (Murata’s Proposal) >
Power Supply
Power Supply
Backup Device
Power/Data
Management
Memory
Backup Device
Power/Data
Management
Memory
Power/Data
Management
volatile memory
Ex. DRAM
Power stream
Power stream
Power/Data
Management
volatile memory
Ex. DRAM
V
Murata
Supercap
V
nonvolatile memory
Ex: NAND Flash
Battery
Ex. Manganese Dioxide
Primary Lithium Batteries
Normal operation
Power stream
Normal operation
Power stream
Power/Data
Management
V
Murata
Supercap
Power/Data
Management
volatile memory
Ex. DRAM
volatile memory
nonvolatile memory
Ex: NAND Flash
V
Battery
In the event of power failure
In the event of power failure
Data stream
(When power failure happens)
Murata Manufacturing Co., Ltd.
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Operating
Temp.
(°C)
-40 to 85