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QTRX-MD-03A Reflectance Sensor Array: 3-Channel, 8mm Pitch, Analog Output, Low Current

Product Code: 4443
Excl. VAT: £2.65 Incl. VAT: £3.18
You will earn 2 Robo Points for buying this product

This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage.

In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 30 mm. This version features high-performance, low-current QTRX sensors with lenses.


  • Dimensions: 21.0 × 20.0 × 3.0 mm 
  • Operating voltage: 2.9 V to 5.5 V
  • Sensor type: QTRX
  • Sensor count: 3
  • Sensor pitch: 8 mm
  • Full-brightness LED current: 3.5 mA (independent of supply voltage)
  • Max board current: 9 mA
  • Output format: analog voltages (0 V to VCC)
  • Optimal sensing distance: 10 mm
  • Maximum recommended sensing distance: 30 mm
  • Weight: 1.1 g
pitch × sensorssize
outputmax currentoptimal
8 mm × 3 21.0 × 20.0 analog 3.5 mA 9 mA 10 mm

General specifications

Maximum range: 30 mm
Optimal range: 10 mm
Minimum operating voltage: 2.9 V
Maximum operating voltage: 5.5 V
LED current: 3.5 mA1
Peak wavelength: 940 nm
Maximum current draw: 9 mA2
Sensor type: QTRX
Sensor pitch: 8.0 mm
Sensor count: 3
Output type: A (analog voltages)

Identifying markings

PCB dev codes: irs25j3
Other PCB markings: 0J113813


Can be dynamically reduced to any of 32 available dimming levels.
With all LEDs on at max brightness setting.
Note: this does not differentiate between the A and RC output types.


Pololu QTR Reflectance Sensor Application Note (Printable PDF

Arduino Library for the Pololu QTR Reflectance Sensors (Printable PDF

Whenever possible, items which are in stock are dispatched the same day, or the next working day.

Large and/or heavy items are dispatched by UPS courier service and these orders must be placed before 15:00hrs (GMT) to ensure same day dispatch.

Small items are normally sent using a Royal Mail service for UK orders, and International Airmail or UPS for overseas orders

Returns Policy

QTRX-HD-05x and QTRX-MD-03x Reflectance Sensor Array, back side.

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