Ultra-low Power, High-precision Temperature Sensor - SMT172

• excellent performance: accuracy better than 0.1°, resolution better than 0.0001°C
• duty-cycle (PWM) output
• 2.7 - 5.5 V power supply
• analog voltage output with a low-pass filter
• wide range of packaging possibilities

  • Model Number: SMT172
  • Data Sheet: Date Sheet File
Quantity:
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  • Ultra-low Power, High-precision Temperature Sensor
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Product Specification

SMT172 Temperature Sensor 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

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 sensors are available in a number of encapsulations: TO18, TO92, TO220, SOIC-8L, SOT223, HEC and in a 7 mm ss. probe with 5 mtr cable. The SMT172 can be supplied as a naked die as well.

The SMT172 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. This makes the sensor especially useful in all applications where human conditions (climate control, food processing etc.) are to be controlled.

SMT172 Temperature Sensor 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: 0.0002°C
• Ultra-low current (60µA active or 220nA average)
• Excellent long term stability
• Direct interface with Microcontroller (MCU)
• Wide range of package options

SMT172 Temperature Sensor 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

SMT172 Temperature Sensor Specifications
TA = -45°C to 130°C, Vcc=2.7V to 5.5V, unless otherwise noted

Parameter
Min
Typ
Max
Unit
Conditions
Supply Voltage
2.7
5.5 V

Active current 

50
µA
TA = -45°C, Vcc = 2.7V, no load at the output pin

60
µA
TA = 25°C, Vcc = 3.3V, no load at the output pin

70
µA
TA = 25°C, Vcc = 3.3V, no load at the output pin
Average current

220
nA TA = 25°C, Vcc = 3.3V, one measurement per second
Power down current


0 µA
When controlling with Vcc pin
Accuracy TO18


0.25
°C
-10 °C to 100 °C


0.8
°C
-45 °C to 130 °C


0.1
°C
-20 °C to 80 °C (second order interpretation)


0.4
°C
-45 °C to 130 °C (second order interpretation)
Accuracy TO92/TO220
SOT223


0.35
°C
-10 °C to 100 °C


1
°C
-45 °C to 130 °C


0.25
°C
-20 °C to 80 °C (second order interpretation)


0.8
°C
-45 °C to 130 °C (second order interpretation)
time of measurement 

1.8

ms
TA = 25°C, Vcc = 3.3V, 8 periods
Noise


<0.0002
°C
TA = 25 °C, Vcc = 5 V, 1 s measurement time
Output Duty Cycle 
0.11
0.93
-45°C to 130°C
Output frequency
0.5
7 kHz
1 - 4 kHz for Vcc= 4.7-5.5 V and TA=-25°C to 110°C
PSRR at Vcc 


0.1 °C/V

Repeatability


0.01 °C
TA = 25°C, Vcc = 5V, TO18
Startup time

1 2 ms
after Vcc, start measurement on first negative edge
Long term drift


0,0058
°C
TA = 22°C, Vcc = 5V, 365 days, TO18
Output impedance


100
by design
Operating Temperature
-45
130 °C

Storage Temperature
-50
150 °C

First order relation between Duty Cycle and temperature :                T = 212.77 DC - 68.085
Second order relation between Duty cycle and temperature :            T = -1.43 DC 2 +214.56 DC - 68.6

SMT172 Temperature Sensor Absolute Maximum Rating
TA =25°C. All voltages are referenced to GND, unless otherwise noted.
Power supply voltage
-0.5V to 7V
Output pin load
50mA
Operating temperature range
-55°C to 135°C
Storage temperature range
-60°C to 150°C
ESD protection (HBM)
2000V
Junction temperature
200°C
Soldering temperature (SOIC, SOT)
260°C (10s)

SMT172 Temperature Sensor Ordering code:
SMT172-SOT223
SMT172 in SOT223 encapsulation
SMT172-TO18
SMT172 in TO-18 encapsulation
SMT172-TO92
SMT172 in TO-92 encapsulation
SMT172-TO220
SMT172 in TO-220 encapsulation
SMT172-SOIC
SMT172 in SOIC-8 encapsulation
SMT172-HEC
SMT172 in HEC encapsulation
SMT172-DIE
SMT172 DIE (die size 1.7 x 1.3 mm)

Related products:

SMTAS04USBmini
evaluation board for 4 sensors input (USB connection)
SMTAS08USBmini
evaluation board for 8 sensors input (USB connection)
SMT172 to IIC
converts SMT172 signal to I2C signal (or to SMT160 signal)

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