The RFM3300-D Magnus®-S3 M3D Passive Sensor IC extends the Magnus® line of Smart Passive Sensing™ ICs (Integrated Circuits). The Magnus-S3 M3D Sensor IC (Integrated Circuit) employs Smart Passive Sensing™ technology to enable a new class of maintenance-free and battery-free sensors. The Magnus-S3 M3D can be configured for low-cost sensors that monitor temperature, moisture, and proximity.

A fully compliant sensor is built by combining the Magnus-S3 M3D IC with a low-cost foil antenna. The Magnus-S3 M3D IC can be read by EPC class 1 gen 2 v2.0.1 and ISO/IEC 18000-6C compliant readers. The patented self-tuning Chameleon™ wireless front-end monitors conditions that might detune the sensor antenna and then adapts as needed for precise management of sensor responses.


  • Temperature applications
  • Moisture applications
  • Proximity applications


  • Passive wireless sensor IC
  • On-chip temperature sensor
  • On-chip RSSI sensor
  • On-chip RF sensor
  • Adaptive RF front-end
    • Maintains consistent performance
    • Mitigates antenna detuning
  • Battery-free wireless operation
  • Worldwide UHF from 860 to 960 MHz
  • Meets EPCglobal™ Gen2 (v. 2.0.1)
  • Meets ISO/IEC 18000-6C
  • User-accessible memory
    • 64-bit unique Tag ID (read-only)
    • 128-bit EPC
    • 128-bit user memory
  • Extended temperature range -40 °C to +85 °C

The Magnus-S3 M3D IC incorporates three sensors:

  1. The Chameleon engine generates a SENSOR CODE that quantifies the adaptive RF impedance setting used to match the sensor antenna. With a properly designed antenna, the Chameleon engine can function as an RF sensor and is commonly used in this way to measure moisture. This value can be translated into a measurement of the environmental conditions being sensed or monitored by the antenna. This is particularly useful for monitoring moisture levels.
  2. An on-chip Received Signal Strength Indicator RSSI monitor indicates the amount of RF power reaching the chip. The generated RSSI CODE can be used to filter large populations of sensors. It also allows the wireless reader to manage its output power for optimum sensor performance.
  3. The on-chip temperature sensor generates a TEMPERATURE CODE data value proportional to the temperature. The IC can be calibrated to provide precise temperature measurements.

For more information, please contact our sales team.