Long-lead thermistors

31 March 2010 Circuit & System Protection

Murata’s ‘Thermo-String’ long-lead thermistor range for monitoring the temperature of areas that are hard to reach with surface-mount thermistors is now fully qualified for automotive use. Hot spots may not always be on the PCB or motherboard, so Thermo-String’s long leads of up to 150 mm allow the head of the thermistor to be situated as close to the problem area as possible, even in narrow or small locations.

The NXF series of Thermo-String thermistors includes Murata’s NCP15-series NTC (negative temperature coefficient) chip thermistor in its head. 33 different resistance values are available for maximum design flexibility. The thermistors operate in the temperature range -40 to +150°C (NXFS series) and are RoHS, ELV and AEC-Q200 compliant and halogen free. Thermo-String thermistors also provide flexibility benefits to battery cell, PC, power tool, power supply, measurement equipment, heating system and sensor product makers.

The Thermo-String range also features PTC (positive temperature coefficient) thermistors, in the form of the PXF series. These feature the same long leads, with 25 to 150 mm lengths available, and are suitable for commercial grade electronics. These PTC thermistors have a unique capability whereby connection in a simple series circuit means one circuit can monitor many different hot spots in a design. The PXF series operates over the range -40 to +125°C.

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