July 2012

Multilayer ceramic chip capacitors

MLCCs with a rated AC withstanding voltage

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  • Optimized internal electrode design improves AC withstanding voltage

TDK Corporation has developed a multilayer ceramic chip capacitor that – in addition to its rated DC voltage of 630 V – can withstand a rated AC voltage of 500 VRMS for 60 s and 600 VRMS for 3 s. Thanks to its optimized internal electrode structure the new TDK C3216 and C3225 types exhibit superior AC withstanding voltage, allowing guaranteed ratings to be given not only for the customary DC voltages but also for AC voltages.

The new MLCC is available in two form factors: 3216 and 3225 (IEC). The C3216 type is available for a capacitance range from 1.0 nF to 15.0 nF, while the C3225 type offers a capacitance value of 22.0 nF. Mass production of the new TDK MLCCs started in July 2012.

The main applications for the MLCCs are DC-DC converters and AC-DC converters, as well as noise filters requiring superior AC strength. The thermal characteristics of the new components are compliant with base metal X7R specifications (temperature range from -55 °C to +125 °C, capacitance tolerance of ±15 percent).

Glossary

  • AC withstanding voltage: the AC voltage (VRMS) that the capacitor can withstand for a defined time while maintaining its function in the application

Main applications

  • AC-DC converters between the secondary circuit and frame ground
  • DC-DC converters between the primary and secondary circuit

Main features and benefits

  • Optimized electrode structure results in superior AC voltage strength
  • Thermal characteristics are compliant with X7R specifications (temperature range from -55 °C to +125 °C, capacitance tolerance of ±15 percent

Key data

Type

Dimensions


[mm]

Rated

voltage
[V DC]

Rated AC withstanding voltage [VRMS]

Capacitance


[nF]

Thermal

characteristics

C32163.2 x 1.6 x 1.61.0 500* / 600**1.0 to 15.0X7R
C32253.2 x 2.5 x 2.32.2 500* / 600**22.0X7R

* Voltage applied for 60 s

**Voltage applied for 3 s

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