The J404 developed by TDK Corporation is the first surface mounted surge current limiter (ICL) based on PTC (Positive Temperature Coefficient) technology. This component (order number B59404J0170A062) is designed specifically for applications with DC voltages up to 500 V and AC voltages up to 350 V, and can be used to limit surge currents in applications such as DC buses and charging equipment in electric vehicles.

This product has a very compact design of 13.5 x 10 x 11 millimeters (length x width x height), allowing users to save up to 70% space and weight on PCBs through this surface mount design. These products can be quickly processed on automated production lines. Therefore, this new component is highly suitable for numerous industrial and automotive applications.

The reference temperature for entering the high resistance state of this component is+170 ° C, the thermal capacity is 1J/K, and the thermal time constant is 100s. At room temperature, the resistance is 500 Ω, with a minimum value of 150 Ω. J404 can turn off and fail (short circuit) up to 100 times, and can undergo up to 100000 cycles during capacitor charging and discharging.

The DC bus large capacitor in electric vehicle inverters or industrial variable speed drives will momentarily operate like a short circuit when connected. This sudden high energy cannot damage other components in the system, which is also applicable in the event of failure. At this point, the PTC thermistor heats itself with high current and quickly transitions to a high resistance state to provide this protection, thereby reducing the current to a safe level.

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