Sensors

Temperature sensor design challenges

Temperature monitoring and protection e-book

With over 40 years' experience helping customers optimize their temperature monitoring and protection designs, we've developed a comprehensive e-book covering six unique application challenges involving unique sensor placement and routing considerations. In the Temperature Monitoring and Protection e-book you will learn the design fundamentals of temperature sensing in real-world applications. The  application notes and reference designs provide support and deep insights about the sensor selection process and the considerations required for optimal temperature response.

Topics include:

  • Fundamentals of temperature sensing
  • System temperature monitoring
  • Ambient temperature monitoring
  • Temperature threshold detection
  • Temperature compensation and calibration
  • Body temperature monitoring
  • Fluid temperature monitoring

System temperature monitoring

For many system designs, it is necessary to monitor high-power components (processors, FPGAs, FETs, etc.) to ensure system and user safety. Accuracy of the temperature reading is important, as it enables designers to push performance closer to safety limits or reduce system costs by avoiding overdesigning elsewhere. Our broad portfolio of accurate compact temperature sensors allows the closest placement to these critical components for the most accurate measurements.

Featured temperature sensors for system temperature monitoring

TMP451

Local and remote temperature measurement (±1°C) with the ability to monitor discrete BJTs (bipolar junction transistors) across the system, or substrate thermal transistors/diodes within a processor

TMP1075

High-accuracy (±2°C) upgrade to industry standard LM75 / TMP75 I2C temperature sensor offering up to 4x lower power

TMP103

Cost-efficient digital temperature sensor (±3°C) with I2C or SMBus communication in a small form-factor 0.76mm x 0.76mm package

TMP235

Cost efficient analog temperature sensor offering (±4°C), which can be paired with an existing ADC

Ambient temperature monitoring

Ambient air-temperature monitoring is critical in many applications to control environmental conditions or ensure safe operating conditions. Accurately and quickly measuring ambient temperature can often be a challenge because the sensor may not be completely exposed to the external environment and subject to self-heating effects from other components in the system. Our family of high-accuracy, low-power single and multi-channel temperature sensors in compact packages enables faster thermal response.

Ambient temperature monitoring resources

Featured temperature sensors for ambient temperature monitoring

TMP112

NIST traceable digital temperature sensor pairing high-accuracy (±0.5°C) with low power. I2C, SMBus or two-wire communication can be used

LMT01

High-accuracy (±0.5°C), 2-pin temperature sensor with an easy-to-use pulse count current loop interface. Availability in a TO-92 package offers off-board temperature measurement

TMP103

Cost-efficient digital temperature sensor (±3°C) with I2C or SMBus communication in a small form-factor 0.76mm x 0.76mm package

TMP235

Cost efficient analog temperature sensor offering (±4°C), which can be paired with an existing ADC

Temperature threshold detection

For some applications, continuous temperature collection is unnecessary, but it's critical for the system to stay above or below a temperature threshold. Our family of temperature switches and digital temperature sensors enable simple autonomous temperature monitoring to detect with hysteresis when the temperature crosses its limits. Easily design with a selection of devices that allows threshold trip points to be set via an external resistor, pin-programmable, factory-programed or over I2C.

Featured temperature sensors for temperature threshold detction

TMP302

Temperature switch offering pin-selectable threshold trip point for maximum flexibility in systems leveraging an MCU or processor

TMP390

Temperature switch with factory programmed temperature window comparator to minimize external system components

TMP708

Temperature switch offering resistor-configurable threshold trip point for maximum flexibility in systems that do not have an MCU or processor available

Temperature compensation and calibration

Temperature drift must be a factor in correcting temperature shifts in any system. Temperature will affect everything from passive components (resistors and capacitors, etc.) to active components (amplifiers, data converters, references, clocks, etc.). Even optical components are subject to temperature drift, which changes intensity, spectral shifts, or sensitivity and noise. Our highly linear, high-accuracy temperature sensors provide designers the temperature feedback to correct the effects of temperature in precision systems.

Featured temperature sensors for temperature compensation and calibration

TMP117

NIST traceable, Single chip digital temperature sensor enabling class AA RTD replacement with high accuracy (±0.1°C) and no calibration

LMT70

Ultra-small 0.88mm x 0.88mm analog temperature sensor offering high accuracy (±0.2°C) in systems with an ADC available

TMP112

NIST traceable digital temperature sensor pairing high-accuracy (±0.5°C) with low power. I2C, SMBus or two-wire communication can be used

TMP235

Cost efficient analog temperature sensor offering (±4°C), which can be paired with an existing ADC

Body temperature monitoring

Understanding a patient's temperature is a critical first step in any clinical diagnosis and an important concern for athletes. Beyond the need for ultra-high accuracy, industry trends are moving toward compact wearable form factors to provide continuous temperature monitoring. Temperature sensors with up to 0.1°C accuracy not only meet ASTM E1112 requirements for medical thermometers but also are optimized to keep battery-powered wearables compact and comfortable.

Featured temperature sensors for body temperature monitoring

TMP117

NIST traceable, ASTM E1112 & ISO 80601 compliant, high accuracy (±0.1°C) digital temperature sensor with transmission over either I2C or SMBus

LMT70

Ultra-small 0.88mm x 0.88mm analog temperature sensor offering high accuracy (±0.2°C) in systems with an ADC available

Fluid temperature monitoring

For many metering and industrial processes, it's necessary to either have a direct measure of a fluid's temperature or use the temperature data for compensation purposes to more accurately calculate the volumetric rate of flow. These applications require the sensors not only be small to reduce resistance in the flow, but also low power in cases where the fluid is flammable. We offer low-power analog and digital solutions with accuracy comparable to Class AA RTDs that draw as little as 6.3µW.

Featured temperature sensors for fluid temperature monitoring

TMP117

NIST traceable, high accuracy (±0.1°C) digital temperature sensor with transmission over either I2C or SMBus.

TMP112

NIST traceable digital temperature sensor pairing high-accuracy (±0.5°C) with low power. I2C, SMBus or two-wire communication can be used

LMT01

High-accuracy (±0.5°C), 2-pin temperature sensor with an easy-to-use pulse count current loop interface. Availability in a TO-92 package offers off-board temperature measurement