TDK Electronics · TDK Europe

Over-voltage protection

January 30, 2024

TDK offers varistors in SMD design with high surge current capability


TDK Corporation (TSE:6762) presents two new varistor series in SMD design. The types of both series are available for a wide range of operating voltages from 175 VRMS to 460 VRMS, corresponding to 225 VDC to 615 VDC. While the B72210M* series of surge devices, which are equivalent to S14 leaded disk varistors, offers a surge current capability of 6000 A, the B72214M* series types, which are equivalent to S20 leaded disk varistors, have a high surge current capability of 10,000 A. All types are designed for a high operating temperature of a maximum of +125 °C and extremely damp heat environment (85% relative humidity at +85 °C).

The new SMD high surge series is qualified to AEC-Q200. In terms of designs, all types are available in a horizontal as well as vertical version, which offers higher design flexibility. The horizontal version of the B72210M* series has dimensions of 22 x 15 x 11 mm, while the B72214M* series has dimensions of 27 x 18 x 11 mm, (L x W x H). The vertical types have dimensions of 15 x 10 x 20 mm and 18 x 10 x 25.5 mm, respectively. This results in space saving compared to leaded varistors with the same performance.

Typical applications of SMD surge protection components are on-board chargers, power supplies, frequency converters, photovoltaic systems and household appliances.

Features & Applications

Main applications

  • On-board chargers, power supplies, frequency converters, photovoltaic systems and household appliances

Main features and benefits

  • Wide range of operating voltages from 175 VRMS to 460 VRMS
  • High surge current capability of 6000 A or 10,000 A
  • Horizontal and vertical designs
  • Qualified according to AEC-Q200
  • Space saving compared to leaded disk varistors with the same performance

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