Target: temperature
Model: MRT311S
Detection range: -30-100℃
Detection principle: Seebeck principle
Characteristics: High sensitivity, fast response, Good stability, NTC calibration free
Size: TO46 5.4x2.10
Working conditions: 1. Read the resistance value Ra of pins 2 and 4;
2. Find the corresponding ambient temperature Ta in the R-T table based on Ra;
3. Read the voltage Va of pins 1 and 3;
4. Find the voltage value equal to or similar to Va in the Ta column of
Notes: 100±0.5%

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MRT-311 thermopile sensor is based on MEMS technology, consists of hundreds of thermocouples connected in series. Using Seebeck principle, when there is a temperature difference between the target and the environment, the sensor gives the corresponding voltage output, therefore detecting the existence of the target or the temperature of the target.


  • Non-contact temperature measuring
  • Infrared thermometer, such as ear temperature and forehead temperature measurement
  • Continuous temperature control of production process
  • Household appliances (Microwave oven, hair dryers, air conditioners etc), intelligent temperature induction and control system
  • Human presence detection


  • TO-46 metal package
  • High sensitivity
  • Quick response, Good stability
  • High filter transmittance
  • High precision NTC


Parameter Value Unit Remarks
Chip size 1.1×1.1 mm /
Field of view 95  Degree Above 50%
Thermopile resistor 90±30  25℃
Noise voltage 38 nV/Hz1/2 25℃
Noise equivalent power 0.23  nW/Hz1/2 500K, 1Hz, 25℃
Response rate 160±40 V/W 500K, 1Hz, 25℃
Temperature coefficient of resistance 0.06 %/℃ 25℃~75℃
Time constant ≤13  ms  
Detection rate 1.5 ×108  cmHz1/2/W 500K, 1Hz, 25℃
NTC resistance 100 ±0.5% 25℃
NTC(β) 3950 ± 1% / 25℃/50℃
Working temperature -30 ~ 125℃    

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.