Three terminal integrated temperature sensor 
-Duty-cycle (PWM) output 
-2.7 – 5.5 V power supply 
--Analog voltage output with a low-pass filter 
-Wide range of packaging possibilities 
-Market proven excellent quality and stability 
-Used in both: 
High end market (medical and space industry) and 
Low end market (consumer products) 

The SMT172 is a three terminal integrated temperature sensor, with a duty-cycle output.

Two terminals are used for the power supply of 2.7 -5.5 Volts and the third terminal carries the output signal. A duty cycle modulated output is used because this output is interpretable by a microprocessor without A-D converter, while the analogue information is still available.

The sensors are available in a number of encapsulations: TO18, TO92, TO220, SOIC-8L, SOT223 and others. The temperature sensors are available as naked die as well. On request the sensors can also be built in customer specified encapsulations. For quick design-in a lot of application are available on the web and for plug and play we have designed Smart Temperature Acquisition System for 4 or 8 Smartec Temperature Sensors. It was designed to get the best possible temperature measurement results with the SMT172 Smartec temperature sensors (absolute accuracy 0.25 °C, noise <0.0004 °C), at little cost. With it, you don't have to develop your own hardware application to connect 8 SMT172 temperature sensors to a PC. This board does it for you. On our website an application can be found to connect the board to an Excel or a simple labview application. In this way a low budget high accurate measurement system can be build.

The SMT172 has an overall accuracy of 0.25 °C in the range from -30 °C to +100 °C and an accuracy of 0.8 °C from -45 to +130 °C. This makes the sensor especially useful in all applications where "human" (climate control, food processing etc.) conditions are to be controlled.

The CMOS output of the sensor can handle cable length up to 20 meters. This makes the SMT172 very useful in remote sensing and control applications.