KTIR0711S reflective optocoupler sensor* - 5pcs*

Reflective optocoupler used, for example, to distinguish the edges. The system is closed in a small, surface soldered case with dimensions: 2.7 x 3.4 mm. Items are sold in sets of 5 pieces.

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Price 12,50 zł

Specification of the optocoupler:

  • The maximum voltage of the IR LED: 5 V
  • The maximum current of the IR LED: 50 mA
  • The maximum collector-emitter voltage: 30 V
  • Maximum collector's current: 20 mA
  • Case soldered on the surface (SMD)

Transoptor osiowy

Details in the documentation.



Product description: Sensor reflective optocoupler KTIR0711S

The sensor sends a beam of radiation through the IR transmitter, then measures the intensity of the  light reflected through phototransistor. The output is a voltage signal dependent on the light intensity falling on the detector. The more light will be reflected and get to photodetector, the higher wil be the output voltage. As the light is reflected better by the bright surface (dark surface absorbs it), the voltage will be higher on a white material.

Schemat ideowy KTIR0711S


The use of reflective sensor

The sensors are readily used by designers of Line Follower robots to detect lines, as well as in the minisumo construction where it is used to detect the edges of the ring. As, in these cases, detected are the extreme values (to distinguish black from white - intermediate values are not important), the sensor can be located higher above the surface than the documentation indicates. From our experience, we can tell that with appropriate selection of resistors, sensors correctly distinguish the black insulating tape from the white background from a distance of about 0.5 cm.

The advantage of the sensor are small size and light weight. It lacks, however, the protective case (which can be found in the CNY70 sensor) so when it is maximally close to the surface, it is not working properly. Therefore, you should take care of the appropriate setting of this parameter.

Connection example KTIR0711S

The sensor consists of two main parts: a detector in the form of phototransistor, and transmitter as an infrared led. For the transmitter not to be damaged, you should limit its current (max. 50 mA), and, consequently, the infrared radiation power. This is done through the resistor connected in series (R3). For the proper operation of the phototransistor, necessary is the pulling-up resistor (marked on the figure as R4). The propert values must be selected using the documentation (example on the picture below).


Schemat podłączenia KTIR0711S

Schemat wyprowadzeń KTIR0711S



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The time of payment depends on the hours of ELIXIR session of the sender's bank and the recipient of the transfer (more information on this subject, for example on the website


The table presents available forms of delivery in Poland


Carrier and

Bank wire

by cash


Poczta Polska

terms of service

9,90 PLN17,90 PLN1-3 days

Kurier GLS

terms of service

14,90 PLN22,90 PLN

1-2 days

Paczkomaty 24/7 

terms of service

12,90 PLN-1-3 days

If the amount to pay for products exceeds 500 PLN
Delivery is for free!


  • Free delivery of orders over 500 PLN does not apply to parcels addressed outside of Poland.
  • Free delivery does not apply when changing orders.
  • The delivery period is counted in working days from the date of dispatch of the order.