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Achieving High Ripple Current Resistance and High Effective Capacitance! Murata Launches Mass-production of General-Purpose KR3 Series and Automotive-Use KC3 Series Metal Terminal Monolithic Ceramic Capacitors

Mon, 11/19/2012 - 10:57pm
Murata Manufacturing

October 16, 2012

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

Achieving High Ripple Current Resistance and High Effective Capacitance! Murata Launches Mass-production of General-Purpose KR3 Series and Automotive-Use KC3 Series Metal Terminal Monolithic Ceramic Capacitors

Overview

Murata Manufacturing Co. Ltd. has launched mass production of metal terminal monolithic ceramic capacitors that achieve high ripple-current resistance and high effective capacitance.

The KR3 series for general-purpose applications and KC3 series for automotive applications are now available. The KR3 series capacitors comply with JIS standards and are optimal for general consumer and industrial electronic devices that are subject to thermal stress and/or vibration/mechanical impact. On the other hand, the KC3 series capacitors comply with the automotive electronic components standard known as AEC-Q200 and are optimal for automotive equipment such as engines, engine control units (ECU) , drive system control, and safety devices.

Background and Details

With rising concern toward global environmental issues and energy issues in recent years, the automobile market is endorsing practical applications of Hybrid Electric Vehicles (HEV) and Electric Vehicles (EV) . Since thermal resistance is a key requirement of electronic components for HEV and EV applications, there is a demand for capacitors that are resistant to high temperatures. In response to this demand, Murata has developed monolithic ceramic capacitors that have high ripple-current resistance (low self-heat generation) using newly developed ceramic materials.

There is also an increasing demand for small and long-life ceramic capacitors with high capacitance as a replacement for electrolytic capacitors and film capacitors used as smoothing capacitors. To meet this demand, Murata uses new materials to assure a high effective capacitance by suppressing the characteristic that lowers electrostatic capacity when a DC bias is applied (during operation) .

Furthermore, there is a possibility that cracks may occur in a capacitor element and solder joints of mounted components due to thermal stress or vibration/mechanical impact. Therefore, crack prevention measures must be provided for automobiles, general electronic devices, and industrial electronic devices that are used under such conditions. Murata has reduced the effects of impact to chip elements and solder joints of mounted components by attaching metal terminals with an elastic action to the capacitors.

Features

High ripple-current resistance

Since it has low loss and a high allowable current capacity, the heat generation of the capacitor (self-heat generation) can be reduced at the time of passing current.

Example: (See the upper right graph below.) The new material product has approximately 1.6 times higher allowable current capacity at a frequency (f) of 250kHz. In the case of products with a capacitance of 1μF when the heating temperature is 20°C at a frequency (f) of 250kHz, the allowable current capacity of capacitors made of conventional materials is 2.9Arms whereas that of capacitors made of the new material is 4.7Arms.

High ripple-current resistance

High effective capacitance

It is possible to reduce the drop in capacitance while a DC bias is applied, as well as assure high effective capacitance value.

Example: Approximately twice higher capacitance is assured when DC250V is applied.

High effective capacitance

Applications

General-purpose applications (KR3 series)

  • Smoothing and EMI filter for LED lighting
  • Used for the Power Factor Correction (PFC) circuit in the switching power supplies and AC adaptor
  • DC-DC converter for general electronic devices

Automotive applications (KC3 series)

  • Used for drive system control in equipment such as engines and ECUs
  • Used for other drive system controls and safety devices

Part List

KR3 series capacitors for general-purpose applications

Rated voltage
(DC)
Length (L) x Width (W)
(mm)
Thickness (T)
(mm)
Temperature
characteristics
Capacitance Capacitance
tolerance
Murata part number
250V 6.1 x 5.3 2.8±0.2 X7T 0.47µF ±10% KR355LD72E474
KH01K
6.1 x 5.3 3.7±0.2 X7T 1µF ±10% KR355QD72E105
KH01K
6.1 x 5.3 6.4±0.3 X7T 2.2µF ±20% KR355WD72E225
MH01K
450V 6.1 x 5.3 2.8±0.2 X7T 0.22µF ±10% KR355LD72W224
KH01K
6.1 x 5.3 2.8±0.2 X7T 0.47µF ±10% KR355LD72W474
KH01K
6.1 x 5.3 3.7±0.2 X7T 0.56µF ±10% KR355QD72W564
KH01K
6.1 x 5.3 4.8±0.2 X7T 1µF ±20% KR355TD72W105
MH01K
6.1 x 5.3 6.4±0.3 X7T 1.2µF ±20% KR355WD72W125
MH01K
630V 6.1 x 5.3 2.8±0.2 X7T 0.1µF ±10% KR355LD72J104
KH01K
6.1 x 5.3 4.8±0.2 X7T 0.15µF ±20% KR355LD72J154
KH01K
6.1 x 5.3 3.7±0.2 X7T 0.22µF ±10% KR355QD72J224
KH01K
6.1 x 5.3 3.7±0.2 X7T 0.27µF ±10% KR355QD72J274
KH01K
6.1 x 5.3 6.4±0.3 X7T 0.47µF ±20% KR355WD72J474
MH01K
6.1 x 5.3 6.4±0.3 X7T 0.56µF ±20% KR355WD72J564
MH01K

KC3 series capacitors for automotive applications

Rated voltage
(DC)
Length (L) x Width (W)
(mm)
Thickness (T)
(mm)
Temperature
characteristics
Capacitance Capacitance
tolerance
Murata part number
250V 6.1 x 5.3 2.8±0.2 X7T 0.47µF ±10% KC355LD72E474
KH01K
6.1 x 5.3 3.7±0.2 X7T 1µF ±10% KC355QD72E105
KH01K
6.1 x 5.3 6.4±0.3 X7T 2.2µF ±20% KC355WD72E225
MH01K
450V 6.1 x 5.3 2.8±0.2 X7T 0.22µF ±10% KC355LD72W224
KH01K
6.1 x 5.3 2.8±0.2 X7T 0.47µF ±10% KC355LD72W474
KH01K
6.1 x 5.3 3.7±0.2 X7T 0.56µF ±10% KC355QD72W564
KH01K
6.1 x 5.3 4.8±0.2 X7T 1µF ±20% KC355TD72W105
MH01K
6.1 x 5.3 6.4±0.3 X7T 1.2µF ±20% KC355WD72W125
MH01K
630V 6.1 x 5.3 2.8±0.2 X7T 0.1µF ±10% KC355LD72J104
KH01K
6.1 x 5.3 4.8±0.2 X7T 0.15µF ±20% KC355LD72J154
KH01K
6.1 x 5.3 3.7±0.2 X7T 0.22µF ±10% KC355QD72J224
KH01K
6.1 x 5.3 3.7±0.2 X7T 0.27µF ±10% KC355QD72J274
KH01K
6.1 x 5.3 6.4±0.3 X7T 0.47µF ±20% KC355WD72J474
MH01K
6.1 x 5.3 6.4±0.3 X7T 0.56µF ±20% KC355WD72J564
MH01K

External Size

Outside dimensions (1-tier product)

Outside dimensions (1-tier product)

Outside dimensions (2-tier product)

Outside dimensions (2-tier product)

*Note: Thickness (T) varies depending on part number. For further details, see the "Parts List."

Production

Mass production is being carried out at Izumo Murata Manufacturing Co., Ltd. from September 2012.

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