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Achievement of an Expected Service Life of 5 Years at 70°C Start of Mass Production of "Highly Reliable Electric Double-Layer Capacitors" for Power Supply Backup Applications

Wed, 05/30/2012 - 1:54am
Murata Manufacturing

May 30, 2012

Murata Manufacturing Co., Ltd.
President/ Statutory Representative Director: Tsuneo Murata

Achievement of an Expected Service Life of 5 Years at 70°C Start of Mass Production of "Highly Reliable Electric Double-Layer Capacitors" for Power Supply Backup Applications
Achievement of an Expected Service Life of 5 Years at 70°C Start of Mass Production of "Highly Reliable Electric Double-Layer Capacitors" for Power Supply Backup Applications

Overview

Murata Manufacturing Co., Ltd. will start mass production of the DMG series of highly reliable electric double-layer capacitors*1 from June 2012. The DMG series is intended mainly for SSD*2 backup applications, and features low resistance and excellent long-term reliability at high temperatures, in a thin package.

Background

Murata introduced technology developed by CAP-XX, an Australian firm and Murata business partner as of 2008, and commenced mass production of the DME and DMD series of electric double-layer capacitors from December 2010. However, the increasing popularity of SSD in recent years has led to demands for thin, low-resistance capacitors that assure long-term reliability under high temperatures, as backups in the event of power failures.
The DMG series suppresses the degradation of characteristics under high temperatures by optimizing the electrolyte and other materials. This realized the desired heat resistance that had not been possible thus far, and achieved an expected service life of 5 years at 70°C. In addition, realization of a low resistance of 70 mΩ in a thin package enables highly efficient charging and discharging over a wide input and output range.
The DMG series is designed for applications that anticipate long-term use, and can be used over a wide input and output range as power supply backups for SSD and communication systems, and as energy-harvesting capacitors.

Features

  • Low ESR (equivalent series resistance) of 70 mΩ to 130 mΩ enables high-current, high-output charging and discharging.
  • Operating temperature range: -30°C to +85°C
  • Long-term reliability of 5 years at 70°C

Applications

  • SSD backup
  • Smart meters
  • Power supply backup for communication systems
  • Other power supply system backup
  • Energy harvesting

Terminology

*1 Electric double-layer capacitor: These devices store energy merely by physical ion adsorption on an activated charcoal surface, without employing a chemical reaction. This enables repeated charging and discharging that is semi-permanent, as compared to typical rechargeable batteries, and rapid charging and discharging are also possible. These energy-storage devices are also attracting attention for their low environmental load, as they contain no lead or other potentially harmful substances, and are thus RoHS-compliant. (RoHS: Restriction of use of Hazardous Substances; an EU directive restricting the use of hazardous substances in electrical and electronic equipment)
This technology will play an expanding role in environmentally sound lifestyles, in applications from memory backup in home appliances, mobile phones, information terminals, and other electronic devices to power storage in hybrid vehicles or off-peak energy-storage systems.
*2 SSD: Solid State Drive. A type of auxiliary storage device using flash memory. Unlike hard disk drives (HDD) , SSDs have no disk, which enables higher read and write speeds.

Part Numbers

  • DMG2E2R1M704M2BTA0
  • DMG2U4R2S354M3BTA0

Characteristics

Part number Rated voltage Nominal capacitance ESR@1kHz Thickness
DMG2E2R1M704M2BTA0 2.1V 700mF 70mΩ 1.4mm
DMG2U4R2S354M3BTA0 4.2V 350mF 130mΩ 2.8mm

*Outer dimensions: 18.5mm x 20.5mm
*The capacitor lineup will be expanded in the future.
*Operating temperature range: -30°C to +85°C

Electric characteristics

High-temperature DC load test characteristics

DMG2E2R1M704M2BTA0

Capacitance and ESR degradation, test time 3000 hours
(comparison of mass-produced DMD product and new DMG product)

70°C high-temperature DC load test: DC 2.1 V/cell
70°C high-temperature DC load test: DC 2.1 V/cell

70°C high-temperature DC load test: DC 2.1 V/cell

Constant output discharge characteristics (25°C)

DMG2E2R1M704M2BTA0

Constant output discharge characteristics (25°C)

External Size

External Size 2.1V

2.1V

External Size 4.2V

4.2V

Production

Mass production of 200,000 units per month will start from June 2012 at Fukui Murata Manufacturing Co., Ltd.

Sample Price

  • 2.1V: 400yen
  • 4.2V: 700yen
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