Overview
The ST25R3915-AQFT is an automotive-grade HF/NFC reader IC designed to meet the rigorous requirements of modern NFC infrastructure, access systems, and in-vehicle electronics. It supports multiple industry protocols including ISO14443A/B, ISO15693, FeliCa, and ISO18092 (NFCIP-1). With an operating voltage range of 2.4 V to 5.5 V, a high RF output capability of up to 1 W, and bit rates reaching 848 kbit/s, the device delivers strong RF performance combined with reliable communication for demanding embedded applications. Its wide temperature range of –40°C to +125°C and AEC-Q100 Grade 1 qualification make it ideal for automotive environments.
Core Parameters
| Parameter | Specification |
|---|---|
| Supply Voltage | 2.4 V to 5.5 V |
| RF Output Power | Up to 1 W (differential drive) |
| Supported Standards | ISO14443A/B, ISO15693, FeliCa, ISO18092 (NFCIP-1) |
| Bit Rate | Up to 848 kbit/s |
| FIFO Size | 96 bytes |
| Wake-Up Detection | Capacitive, amplitude, phase |
| SPI Interface | 6 Mbit/s, 4-wire |
| Operating Temperature | –40°C to +125°C |
| Package | QFN32, 5×5 mm |
Features
- Automotive AEC-Q100 Grade 1 qualification
- Multi-standard NFC/HF reader: ISO14443A/B, ISO15693, FeliCa, NFCIP-1
- Differential antenna driver delivering up to 1 W RF power
- High bit-rate communication supporting 848 kbit/s
- 96-byte FIFO for efficient frame buffering
- Integrated low-power card detection via capacitive, amplitude or phase sensing
- Dual AM and PM demodulation channels for robust reception
- Supports 13.56 MHz or 27.12 MHz crystal operation
- Wide supply voltage suitable for vehicle systems (2.4–5.5 V)
- Ultra-low-power wake-up architecture for energy-sensitive systems
Typical Application Scenarios
| Application | Why ST25R3915-AQFT Is Suitable |
|---|---|
| Automotive NFC (door handle, center console, IVI) | AEC-Q100 Grade 1 qualification and high RF power ensure robust field performance |
| Secure Access Control | Multi-protocol support ensures compatibility with most commercial HF cards |
| Payment / Ticketing Terminals | High data rate and strong demodulation improve transaction reliability |
| Industrial NFC Systems | Wide temperature tolerance and strong HF output support demanding environments |
| Kiosk and Smart Infrastructure | Long-range HF capability with flexible low-power sensing modes |
Performance Comparison
| Parameter | ST25R3915-AQFT | Conventional HF Reader A | Conventional HF Reader B |
|---|---|---|---|
| RF Output Power | 1 W | 200–500 mW | ~600 mW |
| Protocol Support | ISO14443, 15693, FeliCa, NFCIP-1 | Limited | Broad |
| Wake-Up Methods | Capacitive, amplitude, phase | Basic amplitude | None |
| Operating Temperature | –40°C to +125°C | –20°C to +85°C | –40°C to +105°C |
| Automotive Grade | AEC-Q100 | No | Partial |
Conclusion
The ST25R3915-AQFT delivers a powerful combination of 1 W RF output, multi-standard NFC/HF compatibility, and automotive-grade robustness. Its advanced low-power detection features, wide operating voltage, and high-temperature endurance make it exceptionally well-suited for automotive NFC applications, smart access systems, industrial terminals, and embedded NFC-enabled devices. For designers requiring reliable performance, long range, and stringent automotive compliance, the ST25R3915-AQFT offers a complete HF reader solution.
Manufacturer Profile
STMicroelectronics (ST) is a global semiconductor leader known for producing reliable, high-performance mixed-signal ICs for automotive, industrial, and consumer markets. The ST25R series reflects ST’s expertise in NFC and HF reader technologies, combining strong RF capability, low-power operation, and wide protocol compatibility.
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