Inrush current limiting PTC thermistors for automotive and industrial applications

15-03-2024 | Vishay | Passives

Vishay Intertechnology, Inc. has released a new series of inrush current-limiting PTC thermistors. Designed to increase performance in active charge and discharge circuits for automotive and industrial applications, the Vishay BCcomponents PTCEL series devices combine a broad range of resistance at 25C (R25) values with high voltage and energy handling capabilities.

Featuring R25 values from 60-Ohm to 1kOhm, the devices released today enable high maximum voltages of 1000VDC at 500-Ohm and 1200VDC at 1kOhm, and maximum energy handling to 240J – four times higher than competing devices. Combining multiple thermistors in parallel can achieve energy absorption levels over 1000J. With their high temperature operation to +105C, the PTCEL series provides a heat capacity to 2.3J/K for all resistance values.

AEC-Q200 qualified and self-protecting – with no risk of over-heating – the thermistors provide overload protection in AC/DC and DC-DC converters; load dump, DC-Link, battery management, and emergency discharge circuits; onboard chargers; home energy storage systems; motor drives; and welding equipment. The devices withstand >100,000 inrush-power cycles for these applications and are highly resilient against non-switching peak power up to 25kW.

The series is available in two sizes: the smaller PTCEL13R and larger PTCEL17 for low and high-energy applications, respectively. All devices are available in tape-on-reel packaging and offer a leadwire pitch of 5mm. In addition, the PTCEL17R is available with leadwire pitches of 7.5mm and 10mm to accommodate their higher voltages. It can also be automatically handled by pick-and-place equipment for lower placement costs.

The barium titanate thermistors consist of a ceramic pellet soldered between two tinned CCS wires and coated with a UL 94 V-0 compliant high-temperature silicone lacquer. The RoHS-compliant devices are C-UL-US recognized under file E148885 for AC and DC use, providing an increased and controlled safety level. SPICE and 3D models for the PTCEL13R and PTCEL17R are available.


By Seb Springall

Seb Springall is a seasoned editor at Electropages, specialising in the product news sections. With a keen eye for the latest advancements in the tech industry, Seb curates and oversees content that highlights cutting-edge technologies and market trends.