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TDK Releases World’s First SMD Inrush Current Limiter

31.10.2023
Reading Time: 2 mins read
A A

TDK Corporation has developed the J404, the world’s first surface-mountable inrush current limiter (ICL) based on PTC (positive temperature coefficient) thermistor technology.

Designed for DC voltages of up to 500 V and AC voltages of up to 350 V, the device (order number B59404J0170A062) automatically and intrinsically limits excessive currents in applications such as DC links and charging devices in electromobility.

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Due to the very compact dimensions of 13.5 x 10 x 11 mm (L x W x H), users can save up to 70% space and weight on the PCB with this surface-mount design. The components can also be processed quickly in automated production lines. As a result, the new component is ideally suited for numerous industrial and automotive applications.

The reference temperature at which the device becomes highly resistive is +170 °C, with a heat capacity of 1 J/K and a thermal time constant of 100 s. At room temperature, the electrical resistance is 500 Ω, with a minimum value of 150 Ω. The J404 can switch off a defect (short circuit) up to 100 times, and up to 100,000 cycles when charging and discharging capacitors.

Large capacitors in DC link circuits, found in e-mobility inverters or variable-speed drives in industrial applications, act temporarily like a short circuit at the moment they are switched on. This high energy must not damage other components in the system; the same applies in the event of a defect. A PTC thermistor provides such protection by heating itself due to the high current and becoming highly resistive in a very short time, thereby reducing the current to a safe level.

Features

  • Surface mountable (reflow solderable)
  • Space and weight savings on PCBs
  • Intrinsically safe in case of a failure and resettable
  • Qualification according to AEC-Q200

Applications

  • Traction inverter for xEV
  • Charging and discharging DC link capacitors
  • Variable speed drives
  • Switched-mode power supplies

Related

Source: TDK

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