New Product Bulletins
Electric Double Layer Capacitors (EDLC)
SR / VR / VT Series
Ultra-low resistance design (0.7F/25mΩ)
ideal for auxiliary power supplies in portable devices
Product Outline
In recent years, EDLCs, which feature high capacity and excellent charge/discharge capability, are quickly gaining
ground as auxiliary power supplies for applications requiring high output in a short period of time, such as digital
camera LED flash, smartphones, and energy storage countermeasures against instantaneous voltage drops
(e.g.SSD). Our products feature a strong aluminum laminate exterior that facilitates automatic mounting, as well as
the smallest resistance in their class (SR/VR series), contributing to improved performance and smaller, thinner,
end-products.
■ The industry’s lowest resistance
Technology for reducing
internal resistance
Interface Resistance
Reduction
Bulk Resistance
Reduction
Ion Diffusion
Resistance Reduction
Improved metal foil surface
Improved active material
conductivity
Improved ion conductivity
0.7F/25mΩ
■ EDLC Series
Low Resistance
Type
(SR Series)
Low Resistance/
High Voltage
Type
(VR Series)
High Temperature
Type
(VT Series)
Rated Voltage
2.7V
3.0V
2.7V
Capacitance
0.7F
0.7F
0.7F
Internal
Resistance
25mΩ
25mΩ
70mΩ
Time Constant
17.5mΩF
17.5mΩF
49mΩF
Operating Temp.
Range
-30 to +70°C
-30 to +65°C
-30 to +80°C
Size
25×25×1.4mm
25×25×1.4mm
(SR / VR Series)
25×25×1.4mm
(Values for single-cell type)
■ Application Examples
P/S
Large peak current
P/S
EDLC
Current
P/S
Threshold
Peak
cut
Supply from EDLC
Smaller power supply
can be used
Applications that require a large voltage load in a short period of time such as
LED flash instantaneously reduces the power supply voltage, draining the
battery. EDLC is designed to assist this large instantaneous load, limiting the
supply voltage drop, prolonging battery life. In addition, the longer operating
time provided by this assist operation makes it possible to reduce the size of
the main power supply for increased miniaturization.
Current
Interruption
Normal
Large power supply
required
Fail
Threshold
Protects against instantaneous voltage drops
Reduces peak current
With EDLC
blackout
With EDLC
P/S
EDLC
Malfunction
blackout
Current
Current
Threshold
Battery Assist
Without EDLC
Current
Peak Assist
Without EDLC
Current supply
from EDLC
Normal
Threshold
EDLCs can be used as a battery assist to prevent equipment malfunction,
stoppage, and even damage caused by various factors, including power
outages, voltage fluctuations, and instantaneous voltage drops, by rapidly
discharging stored energy.