ST25R3915-AQFT

ST25R3915-AQFT is STMicroelectronics’ high-performance 13.56 MHz NFC/RFID reader/writer IC. It combines the RF front end, baseband, and control logic in one device, enabling a host MCU to read/write contactless tags and cards and to support NFC features. It supports major 13.56 MHz standards such as ISO/IEC 14443 Type A/B and ISO/IEC 15693, with reader/writer and card-emulation capabilities, fast anti-collision, and field management. The IC interfaces to a host controller via a serial interface (SPI) and offers programmable options for RF field strength, data rate, timing, and modulation. It is suitable for compact, low-power contactless readers in applications like access control, ticketing, NFC-enabled devices, smart posters, and point-of-sale terminals. The AQFT suffix denotes the specific package variant (lead-free, compact ST package). Development resources include the ST25R3915 datasheet, application notes, and evaluation kits from ST.

ST25R3915-AQFT is a high-sensitivity 13.56 MHz NFC/RFID reader IC. Key features:
- Multi-protocol NFC/RFID front-end: ISO/IEC 14443 Type A and B, Felica, and ISO/IEC 15693; NFC Forum Type 4 Tag emulation supported on suitable configurations.
- Fully integrated RF front-end: LNA, mixer, demodulator, and power detector with automatic gain control for high sensitivity and robust field handling.
- Flexible data rates and anti-collision: supports standard NFC/RFID data rates with fast card detection, selection, and collision handling.
- MCU interface: SPI (host microcontroller interface) with programmable registers, FIFO, and control logic for easy integration.
- Power management: optimized wake-up and low-power modes suitable for reader nodes and battery-assisted applications.
- Compact packaging: AQFT package with robust ESD protection and wide operating conditions.
- Suitable applications: access control, transit, payment, asset tracking, and multi-protocol NFC readers/writers.
Note: Exact data rates and supported tag emulations may vary by revision; consult the latest ST datasheet for precise details.

ST25R3915-AQFT is supplied in a 32‑lead UFQFN/QFN package (5.0 × 5.0 mm body, 0.5 mm pitch) with an exposed thermal pad. The “-FT” suffix indicates tape-and-reel shipment.

The ST25R3915‑AQFT is supplied in a 32‑pin QFN package. Its pin functions (grouped by role) are:
- Power/Ground: VDD, AVDD, DVDD, GND pins for analog/digital supplies and ground.
- RF/antenna: ANT/ANT1/ANT2 and matching/tuning pins for the antenna/LNA/PA front end.
- Host interface: SPI (SCK, MISO, MOSI, NSS/CS) and I²C (SDA, SCL) compatible pins for MCU communication.
- Control/interrupts: EN/RESET, IRQ and several configurable GPIOs for control and signaling.
- Clock/oscillator: CLK/REF and related clocking pins (external oscillator or reference input).
- Power-management/energy harvesting: pins for rectified/harvested voltage and VBAT/regulator connections.
- Test/grounding: dedicated RF ground and test/debug pins.
For a complete pin‑by‑pin description and electrical characteristics refer to the ST25R3915 datasheet and STMicroelectronics pinout drawing.

Manufacturer: STMicroelectronics.
Type of company: STMicroelectronics is a multinational semiconductor manufacturer (an integrated device maker) that designs and produces a wide range of ICs and discrete components — including microcontrollers, analog/power devices, sensors, MEMS, RF/NFC transceivers (like the ST25R series). Headquartered in Geneva, Switzerland.

ST25R3915-AQFT is a high‑performance NFC/RFID reader IC. Typical applications:
- Contactless payment terminals and tag reading
- Access control and secure entry systems
- Public transport fare collection
- Asset tracking, inventory and supply-chain tagging (ISO/IEC 14443/15693)
- NFC-enabled consumer devices, smart posters and interactive signage
- Industrial IoT gateways and embedded readers for smart devices

Equivalent 13.56 MHz NFC/RFID front-end ICs (similar functionality):
- STMicroelectronics: ST25R3911B, ST25R3916
- NXP Semiconductors: PN512, PN532, PN5180
- Microchip: MFRC522, MFRC630
Note: exact feature parity varies by device (protocol support, interfaces, performance).