Compact limiter J404

inrush currentDC

Product overview The J404 is the world’s first surface-mountable inrush current limiter (ICL) based on PTC (positive temperature coefficient) technology. It is designed for DC voltages up to 500 V and AC voltages 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. Due to very compact dimensions (13.5 x 10 x 11 mm L x W x H), the surface-mount design enables up to 70% space and weight savings on the PCB and is compatible with automated production lines. 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 typically 500 Ω with a minimum value of 150 Ω. The J404 can switch off a defect (short circuit) up to 100 times and withstand up to 100,000 cycles when charging and discharging capacitors. A PTC thermistor provides protection by heating under high current and becoming highly resistive in a short time, thereby reducing current to a safe level. As of August 2023, according to own research.

Features & Applications

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

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

Technical specifications

• Model name: J404
• Order number: B59404J0170A062
• Technology: PTC thermistor (inrush current limiter)
• DC voltage rating: up to 500 V
• AC voltage rating: up to 350 V
• Typical electrical resistance at room temperature: 500 Ω (minimum 150 Ω)
• Reference (trip) temperature: +170 °C
• Heat capacity: 1 J/K
• Thermal time constant: 100 s
• Mechanical dimensions (L x W x H): 13.5 x 10 x 11 mm
• PCB mounting: Surface-mount, reflow solderable
• Switching capability: can switch off a defect (short circuit) up to 100 times
• Cycling for capacitor charge/discharge: up to 100,000 cycles
• Typical applications: DC links, e-mobility charging devices, traction inverters, variable speed drives, SMPS
• Qualification: AEC-Q200