JonDeTech Thermopile Products

JonDeTech has at the moment two thermopile heat sensing products: the JIRS3 and JIRS5 detectors. Both are so called thermal radiation sensors and measures from mid infrared to visual light. The differences between these two products are the sensor area (footprint),3x3 and 5x5 mm respectivly, and the sensitivity. The larger the sensor area, the higher the performance (i.e. voltage response to irradiance).


  • JIRS3 (datasheet)
    This sensor has a 3x3 mm footprint and a voltage respons of approximately 4 Vmm2/W


The JonDeTech thermopile gives a direct, proportional voltage response when subjected to infrared light (thermal radiation) or heat. The sensor registers wavelengths from visual light up to the mid infrared region (at least 20 µm). The unique geometrical configuration where the thermocouple leads/legs are "vertically" arranged makes it possible to also use it as a heat flux or ΔT sensor, i.e. the heat gradient over the thickness (less than 0.2 mm) of the thermopile chip is actually measured.

The JonDeTech thermopile SMDs are robust and they can be used "bare", i.e. without protective housing such as a metal container.

The performance of the sensors is illustrated in the video above.



Ordering Information

You can order an Evaluation Kit (which can, if desired, be tailored to meet your specific demands). More information on this and customer options is found in JonDeTech Evaluation Kit.

For more information contact us using the information request form, or by email to info@jondetech.se.

The performance of the sensors is illustrated in the video above.


Key Features of the Thermopile

  • The thermopile sensor is thin (0.17 mm) and bendable

  • The sensors can be surface mounted to most PCBs

  • The sensor measures the thermal gradient over its own thickness (perpendicular to the plane)

  • The sensor can therefore be used to measure both thermal radiation and heat flux

  • Standard module dimensions are 3x3 mm (JIRS3) and 5x5 mm (JIRS5)

  • Specific detectivity in the range of D*=1e7 to 2e7 cm√Hz/W

  • Voltage response to irradiance for 5x5 mm sensor area: Iv=>12 Vmm2/W

  • Arrays of sensors can be mounted side-by-side on a PCB to create the required detector area






  • JIRS5 (datasheet)
    This sensor has a 5x5 mm footprint and a voltage respons of approximately 12 Vmm2/W



Above, close up on the JIRS3 sensor showing the active sensor area.


JonDeTech builds flat (0.2 mm) and robust IR-sensors based on thermopiles that are surface mountable.

Traditional infrared sensors are encapsulated in bulky metal containers requiring through-hole mounting.