STMicroelectronics – Reader IC supports all the main RFID protocols


STMicroelectronics’ ST25RU3993 is an RFID reader IC which implements all the relevant protocols, including ISO 18000-6C (the EPC Class1 Gen2 standard), the ISO 29143 air-interface protocol for mobile RFID interrogators, and ISO 18000-6A/B for operation in direct mode.

It includes an on-chip oscillator and a power amplifier, and offers a complete set of RFID features including Dense Reader Mode (DRM) functionality and support for frequency hopping, low-level transmission coding, low-level decode, data framing and cyclic redundancy checking.

The ST25RU3993 operates at very low power, making it suitable for use in portable and battery-powered equipment.

Housed in a 7mm x 7mm QFN package, the ST25RU3993 offers very high sensitivity and provides high immunity against the effects of antenna reflection and self-jamming. This is crucial in mobile and embedded applications, in which antenna design is often compromised by cost or size constraints. High sensitivity enables end-products to achieve the required read range while using a simpler and cheaper antenna, thus reducing overall system cost.

Thanks to its high level of integration, the ST25RU3993 requires only an external 8-bit microcontroller to create a complete RFID reader system, eliminating the need for a complex RFID co-processor.


  • Integrated supply regulators
  • Support for frequency hopping
  • Amplitude Shift Keying (ASK) or PR-ASK modulation
  • Phase bit for tag tracking with 8-bit linear RSSI
  • Operating-temperature range: -40°C to 85°C


  • RFID readers