Linear thermistors enable operation closer to thermal limits

February 18, 2020 //By Rich Pell
Linear thermistors enable operation closer to thermal limits
Texas Instruments has announced that it has expanded its temperature sensing portfolio to include linear thermistors that deliver up to 50% higher accuracy than negative temperature coefficient (NTC) thermistors.

The higher accuracy of its thermistors, says the company, enables operation closer to the thermal limits of the other components and the overall system, helping engineers maximize performance while reducing bill-of-materials (BOM) and total solution cost. The new linear thermistors are available at a similar price to NTC devices while offered as providing significantly more value – most notably minimizing design time, reducing component count, and increasing system performance.

The TMP61, TMP63, and TMP64 thermistors deliver reliable, highly accurate thermal measurements, particularly at temperatures above 80°C. This is especially important for industrial, automotive, and consumer applications where precise, real-time temperature readings are fundamental to system performance and protection.

The linearity and high accuracy of its thermistors, says the company, enable single-point calibration, which maximizes system performance and simplifies design. This compares with NTC thermistors, which provide less accurate temperature readings due to their low sensitivity and high resistance tolerance at temperature extremes, and may require calibration at multiple points across a temperature range.

In addition, says the company, its thermistors also offer very low typical drift of 0.5% to improve the reliability of temperature measurements, enabling designers to boost system performance while maintaining safe operation. Engineers can use the company's thermistor design tool to quickly and easily calculate temperature resistance values and kick-start their design with example conversion methods and code.

By eliminating the need for additional linearization circuitry or redundant NTC thermistors, says the company, its thermistors help engineers simplify design, lower system cost and reduce printed circuit board (PCB) layout size by at least 33%, compared to NTC thermistors. In addition, the thermistors are one-tenth the size of similar silicon-based linear thermistors, with a low profile and small package area that enable placement closer to thermal hot spots for faster thermal response and more consistent temperature measurements.

The TMP61, TMP63, and TMP64 are available now with starting prices as low as $0.05 in 1,000-unit quantities. The devices are


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