October 5, 2009
Murata Manufacturing Co., Ltd.
President/ Statutory Representative Director: Tsuneo Murata
Murata Manufacturing Co., Ltd. has commercialized “Thermo-String,” a small, high-precision temperature-sensing device utilizing Chip POSISTOR® or a chip NTC thermistor as the detector element. This “Thermo-String” allows for temperature sensing in a tight space due to its ultra small sensing device at less than 1.6 x 0.8 [mm] and coated lead wire with flexible length between 25mm and 150mm. A Chip NTC thermistor used at the detector element enables a lineup with an extensive range of resistance and B-values*.
While an NTC thermistor is generally used at the sensing device, Murata’s overheat detection chip PTC or POSISTOR® may be used in its place simplifying the temperature sensing circuit.
*B-value: A constant representing the variance in resistance corresponding with the temperature
Temperature control becomes more vital as electric equipment become smaller and more densely mounted. Use of lithium-ion rechargeable batteries is increasing becoming more common not only for note-size PCs, but also electric tools and HEVs, creating stronger demands for overheat detection of their battery cells. NTC thermistors, with their varying resistance according to the temperature change, are widely used for temperature sensing of electronic equipment, allowing “Thermo-String” to accommodate a wide range of temperature sensing demands that are now becoming ever stronger. Also, utilizing characteristics of Murata’s PTC thermistor or POSISTOR®, where the resistance value rapidly increases above a certain temperature, allows for more simplified temperature sensing circuit.
| Series | Part Number | Sensing temperature |
|---|---|---|
| NTC lead For general consumer market |
NXFT15*** | -40℃～125℃ |
| NTC lead For automobile electrification |
NXFS15*** | -40℃～150℃ |
| PTC lead For general consumer market |
PXFT15*** | 55℃～130℃ -40℃～140℃ (operating temperature) |
| PTC lead For automobile electrification |
PXFS15*** (Under development) | 55℃～130℃ -40℃～150℃ (operating temperature) |
| Dimensions (mm) | notes | |
|---|---|---|
| D | 1.2±0.4 | Resin width |
| T | 1.2±0.4 | Resin width |
| L | 25～100±2 110～150±3 |
Full length |
| L1 | 3+2/-1 | Soldering part |
| d | 0.30±0.05 | Lead wire Diameter |
300 thousand units per month in August 2009
20 Yen (or about $0.23 at 90 yen /dollar) /per unit (NXFT series)
Varies depending on the specification and the amount.
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