Temperature & Pressure Solutions Made Easy

Phone: 1-800-284-3769

Email: [email protected]

Smartec Digital Temperature Sensor Selection Guide

Smartec Digital Temperature Sensors are available in several encapsulations: TO18, TO92, TO220, SOIC-8L, SOT223. The SMT172-TO18 has an overall accuracy of 0.1 °C in the range from -20 °C to +60 °C and an accuracy of 0.4 °C from -45 to +130 °C. 

Also available is the Smartec Universal Transducer Interface UTI03-SOIC-18 Surface Mount Package (UTI) for integrating multiple sensors.

Contact ThermX Southwest for Technical Design Support
Packaged Probes to Your OEM Specification 1-800-284-3769.

Smartec Digital Temperature Sensors are available in a number of encapsulations: TO18, TO92, TO220, SOIC-8L, SOT223. The Smartec SMT172 can be supplied as a naked die as well.

Features and Highlights

  • World’s most energy efficient temperature sensor
  • 0.36µJ/measurement (TA=25°C, 3.3V)
  • Wide temperature range: -45°C to 130°C
  • Wide supply voltage range: 2.7V to 5.5V
  • High accuracy: ±0.25°C (-10°C to 100°C TO18)
  • ±0.1°C (-20°C to 60°C, TO18)
  • Extreme low noise: 0.002°C
  • Ultra-low current (60µA active or 220nA average)
  • Excellent long term stability
  • Direct interface with Microcontroller (MCU)
  • Wide range of package options

Application

  • Ultra-low power applications: wearable electronics,
    wireless sensor networks
  • Medical applications: body temperature monitoring
  • Instrumentation: (Bio)chemical analysis, precision equipment
  • Environmental monitoring (indoor/outdoor)
  • Industrial applications: process monitoring/controlling
Smartec SMT172 Digitial Sensors

Smartec Data Sheet

Introduction

The SMT172 is an ultra-low power, high-precision temperature sensor that combines the ease of use with the world’s leading performance over a wide temperature range. Using the most recent advances in the silicon temperature sensing technology, the SMT172 has applied some really sophisticated IC design techniques as well as high-precision calibration methods, to achieve an absolute inaccuracy of less than ±0.1°C in the range of -20°C to 60°C and an accuracy of 0.4 °C from -45 to +130 °C. This makes the sensor especially useful in all applications where human conditions (climate control, food processing etc.) are to be controlled. The CMOS output of the sensor can drive cable lengths up to 20 meters. This makes the SMT172 very useful in remote sensing and control applications..

The SMT172 operates with a supply voltage from 2.7V to 5.5V. The typical active current of only 60µA, the high speed conversion over 4000 outputs per second (at room temperature) and an extremely low noise makes this sensor the most energy efficient temperature sensor in the world (0.36µJ/measurement).

The SMT172 has a pulse width modulated (PWM) output signal, where the duty cycle is proportional to the measured temperature. This makes it possible that the sensor can directly interface to a MCU without using an Analog-to-Digital Converter (ADC). Today, the hardware Timer in a MCU to read our PWM signal has become available almost universally, fast in speed and low in cost. Therefore, it is extremely easy for any user to get started with this sensor and achieve a very quick time to market.

This combination of high accuracy, high resolution, high speed, and low-energy consumption makes this sensor suited for commercial and industrial applications.

Smartec SMT172-TO18
  • High accuracy: ±0.1°C (-20°C to 60°C)
  • High accuracy: ±0.25°C (-10°C to 100°C)
  • Ideal for refrigators, freezers, ovens, HVAC
  • Available with up to 25 Ft. PVC or Teflon Leads
  • Probe is 0.270" dia. x 4.5", 316 SS
  • Epoxy sealed for use in humid environments
  • Call 800-284-3769 for custom designs
High Precision Refrigerator Probe
Smartec SMT172-TO18
Specification
Sensor Accuracy,Ta1:
±0.8°C/-45°C ~ 130°C
Sensor Accuracy, Ta2:
±0.1°C/-20°C ~ 80°C
Temperature Coefficient: 10mV/°C
Operating Voltage:
2.7 ÷ 5.5V
Operating Current:
220nA

Ideal for packaging in a SS Tube
with up to 25 Ft leads

Smartec SMT172-TO92
Specification
Sensor Accuracy,Ta1:
±1.0°C/-45°C ~ 130°C
Sensor Accuracy, Ta2:
±0.25°C/-20°C ~ 80°C
Temperature Coefficient: 10mV/°C
Operating Voltage:
2.7 ÷ 5.5V
Operating Current:
220nA
Smartec SMT172-220
Specification
Sensor Accuracy,Ta1:
±1.0°C/-45°C ~ 130°C
Sensor Accuracy, Ta2:
±0.25°C/-20°C ~ 80°C
Temperature Coefficient: 10mV/°C
Operating Voltage:
2.7 ÷ 5.5V
Operating Current:
220nA
Smartec SMT172-SOT223
Specification
Sensor Accuracy,Ta1:
±1.0°C/-45°C ~ 130°C
Sensor Accuracy, Ta2:
±0.25°C/-20°C ~ 80°C
Temperature Coefficient: 10mV/°C
Operating Voltage:
2.7 ÷ 5.5V
Operating Current:
220nA
Smartec SMT172-SOIC
Specification
Sensor Accuracy,Ta1:
±1.0°C/-45°C ~ 130°C
Sensor Accuracy, Ta2:
±0.25°C/-20°C ~ 80°C
Temperature Coefficient: 10mV/°C
Operating Voltage:
2.7 ÷ 5.5V
Operating Current:
220nA
Smartec SMT172-HEC
Specification
Sensor Accuracy,Ta1:
±1.0°C/-45°C ~ 130°C
Sensor Accuracy, Ta2:
±0.25°C/-20°C ~ 80°C
Temperature Coefficient: 10mV/°C
Operating Voltage:
2.7 ÷ 5.5V
Operating Current:
220nA
Universal Transducer Interface (UTI)
The Smartec Universal Transducer Interface UTI03-SOIC-18 Surface Mount Package (UTI) is a sensor-to-time signal converter, based on a self-calibrating period-modulated oscillator. Sensing elements can be directly connected to the UTI without the need for extra electronics. The output is digital and can communicate with any type of micro-controller. The UTI can operate in 16 different modes. To obtain accurate results in any of these modes, a reference element of the same kind as the sensor is required.
 
The UTI provides interfacing for all kinds of resistive and capacitive sensors.

For convenient design-in, there is an evaluation board available. The UTI evaluation board and free downloadable software ensure that custom applications will be up and running in no time.
  • Accurate measurement of various sensors:
  • Capacitance values (2-300 pF, 14 bits)
  • PT100/1000 elements (14 bits 9 mK)
  • Resistive bridges (12 bits, resolution 700 nV)
  • Continues auto-calibration
  • Single power supply2.9-5.5V
phone-handsetmenu-circlecross-circle