News, views & analysis blogs by: Shannon Sullivan


Shannon Sullivan :


Shannon Sullivan :
Murata Electronics North America, a world-leading innovator in electronics and the largest global supplier of ceramic passive components, today announced the launch of the PRG21/18 positive temperature coefficient (PTC) thermistor series for over-current protection. While there are other polymer PTC’s available on the market today, they do not have high reliability levels or the ability to significantly reduce board space. Murata’s PRG series not only achieves these features, but lays the groundwork for automotive design engineers to cut system development costs. The series allows for resin coating, with an adjacent component, for greater thermal sensing and protection of this component. The thermistors can also be used with LEDs to control current to dynamically verse a typical resistor, and it can also provide over-current protection for HEV/EV batteries.

The PRG21/18 series is available in both 0603 and 0805 sizes, the latter of which is the smallest on the market. Further, PTC protection circuits are easy to implement and can be quickly interfaced to a microcontroller. They have no hysteresis, so they can also be used as resettable fuses. Finally, the series has the ability to withstand lead free soldering reflow up to 260C and has an operating temperature range of -40C to +105C.

“At Murata, we are always pushing to provide the most advanced, flexible and cost effective solutions for automotive design engineers,” stated Mitch Nozaki, Product Manager. “To achieve lower PTC resistance, we developed the world’s first ceramic multilayer PTC thermistor. This development will allow for greater current handling while maintaining small package sizes.”
Samples are available for $0.12 to $0.15 per thermistor. Lead time is approximately one to three weeks. Additional purchasing info can be found online at
About Murata Electronics North America (
Murata Manufacturing Co., Ltd., established in 1944, is a global leader in the design, manufacture and sale of ceramic based passive electronic components and power supply modules. With annual revenues in excess of ¥630,000 million, Murata is committed to the development of advanced electronic materials and leading edge, multi-functional, high-density modules. Products include: RF & Microwave Front End Filters, VCO´s, Bluetooth modules, I.F. Filters, Sensors, Chip Multilayer and Chip Dielectric Antennas, RF Diode Switches, Baluns, Isolators, Coaxial Connectors, DC-DC Converters, Traps, Discriminators, Ceramic Capacitors, EMI Filters, Inductors, Piezoelectric Alarms, Ceramic Resonators, Trimming Potentiometers, Trimming Capacitors and Thermistors. The Company is headquartered in Kyoto, Japan, has some 34,000 employees and manufacturing facilities throughout the world.

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