ST25R3916B - NFC Initiator with 1.4W Power | STMicroelectronics
MPN： ST25R3916B ✓ 啟用中ST25R3916B 概覽
An NFC initiator is a device that actively generates an RF field to communicate with passive tags or cards. It is the core component in applications such as point-of-sale terminals, access control readers, and NFC-enabled consumer electronics. The ST25R3916B sits within the NFC reader IC family, which is part of the broader RFID and contactless communication IC category, ultimately falling under wireless communication semiconductors.
Key features include a built-in high-efficiency power amplifier that delivers up to 1.4W, dynamic power control for optimal field strength, and advanced anti-collision algorithms for reliable multi-tag reading. The device also integrates a low-power card detection mode, making it suitable for battery-powered applications. Its high sensitivity and noise immunity ensure robust performance in noisy environments.
The ST25R3916B employs a sophisticated analog front-end with automatic antenna tuning and calibration, simplifying PCB design and reducing component count. It supports both active and passive load modulation, enabling card emulation and peer-to-peer modes. The device includes a comprehensive set of registers for fine-tuning RF parameters, allowing designers to optimize performance for specific antenna configurations.
Typical applications include payment terminals, access control systems, NFC-enabled smart locks, and industrial RFID readers. The high output power extends read range, while the low-power modes preserve battery life in portable devices. The device is also suitable for automotive key fobs and in-vehicle NFC modules.
When designing with the ST25R3916B, careful attention must be paid to antenna matching and power supply decoupling. The device requires a clean supply voltage and proper grounding to achieve optimal RF performance. The SPI interface allows easy integration with microcontrollers, and the interrupt output simplifies event-driven firmware design.
直接替換替代品，適用於 ST25R3916B — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ST25R3916B （相同外形與佔位） — 差異在於 Package.
ST25R3916
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ST25R3917B
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ST25R3916B 規格
| Protocol Support | ISO 14443A/B, ISO 15693, FeliCa |
| Output Power | 1.4 W |
| 供應電壓 | 2.4 V to 5.5 V |
| Operating Frequency | 13.56 MHz |
| 介面 | SPI |
| 工作溫度 | -40C to +85C |
| 封裝 | VFQFPN-32 (5x5 mm) |
| 安裝類型 | Surface Mount |
| Card Emulation | Yes |
| Low Power Card Detection | Yes |
| Dynamic Power Control | Yes |
| Automatic Antenna Tuning | Yes |
| RoHS 狀態 | Compliant |
| MSL 等級 | 3 |
ST25R3916B 腳位配置
| 腳位 1 | VDD — Power supply |
| 腳位 2 | GND — Ground |
| 腳位 3 | SPI_CLK — SPI clock |
| 腳位 4 | SPI_MOSI — SPI data input |
| 腳位 5 | SPI_MISO — SPI data output |
| 腳位 6 | SPI_CS — SPI chip select |
| 腳位 7 | IRQ — Interrupt output |
| 腳位 8 | RF_OUT — RF output |
| 腳位 9 | RF_IN — RF input |
| 腳位 10 | ANT1 — Antenna connection 1 |
| 腳位 11 | ANT2 — Antenna connection 2 |
| 腳位 12 | VDD_TX — TX power supply |
典型應用
ST25R3916B 適用於 6 應用s: Payment Terminals, Access Control Systems, NFC-Enabled Smart Locks, Industrial RFID Readers, Automotive Key Fobs, Consumer Electronics.
Payment Terminals
The ST25R3916B is ideal for payment terminals due to its high output power (1.4W) and support for ISO 14443A/B protocols. It ensures reliable communication with contactless payment cards and mobile wallets. The device's high sensitivity and anti-collision algorithms enable fast and accurate transaction processing, even in crowded environments. Its low-power card detection mode helps reduce standby power consumption, extending battery life in portable POS devices. The SPI interface simplifies integration with secure microcontrollers, and the automatic antenna tuning feature reduces design complexity, ensuring consistent performance across different antenna designs.
推薦
Access Control Systems
The ST25R3916B is well-suited for access control systems, supporting ISO 14443A/B and ISO 15693 protocols used in many access cards. Its high output power extends read range, allowing convenient card presentation. The device's card emulation mode enables mobile access control, where a smartphone emulates a card. The low-power card detection feature allows the reader to remain in a low-power state until a card is present, reducing energy consumption in battery-powered locks. The automatic antenna tuning ensures reliable operation across different antenna sizes and environments, making it a versatile choice for various access control applications.
推薦
NFC-Enabled Smart Locks
The ST25R3916B is perfect for NFC-enabled smart locks, offering high output power for reliable communication with NFC-enabled smartphones and cards. Its low-power card detection mode is crucial for battery-powered locks, as it allows the device to sleep until a card is presented, preserving battery life. The device's support for card emulation enables smartphone-based access, where the phone acts as a virtual key. The compact VFQFPN-32 package fits well in space-constrained lock designs, and the SPI interface simplifies connection to low-power microcontrollers. The automatic antenna tuning ensures consistent performance even with small antennas, making it a reliable choice for smart lock applications.
推薦
Industrial RFID Readers
The ST25R3916B is suitable for industrial RFID readers, supporting ISO 15693 for long-range reading of RFID tags. Its high output power (1.4W) enables reading tags at greater distances, improving efficiency in inventory tracking and asset management. The device's robust design and wide operating temperature range (-40C to +85C) make it reliable in harsh industrial environments. The SPI interface allows easy integration with industrial controllers, and the automatic antenna tuning simplifies deployment with various antenna configurations. The device's anti-collision algorithms enable reading multiple tags simultaneously, increasing throughput in high-volume applications.
推薦
Automotive Key Fobs
The ST25R3916B is used in automotive key fobs for passive entry and passive start systems. Its high output power and support for ISO 14443A/B ensure reliable communication with the vehicle's NFC reader. The device's low-power card detection mode is essential for battery-powered key fobs, as it minimizes power consumption when not in use. The compact package and wide supply voltage range (2.4V to 5.5V) make it suitable for integration into key fob designs. The device's card emulation mode allows the key fob to act as a virtual key, enabling smartphone-based access. The automatic antenna tuning ensures consistent performance with the small antennas used in key fobs.
推薦
Consumer Electronics
The ST25R3916B is used in consumer electronics such as smart speakers, TVs, and wearables for NFC pairing and data exchange. Its high output power and support for multiple protocols enable seamless connectivity with NFC-enabled devices. The device's low-power card detection mode is beneficial for battery-powered wearables, as it reduces power consumption when not in use. The compact VFQFPN-32 package is ideal for space-constrained consumer devices, and the SPI interface simplifies integration with application processors. The automatic antenna tuning ensures reliable performance with the small antennas used in consumer devices, making it a versatile choice for NFC-enabled consumer electronics.
推薦
推薦產品摘要
工程參考資料，適用於 ST25R3916B — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ST25R3916 | ST25R3917B | PN5180 |
|---|---|---|---|---|
| Package | VFQFPN-32 | VFQFPN-32 | VFQFPN-32 | VFBGA-64 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors |
| Output Power | 1.4 W | 1.4 W | 1 W | 1.5 W |
| Protocol Support | ISO 14443A/B, ISO 15693, FeliCa | ISO 14443A/B, ISO 15693, FeliCa | ISO 14443A/B, ISO 15693 | ISO 14443A/B, ISO 15693, FeliCa |
| Supply Voltage | 2.4V to 5.5V | 2.4V to 5.5V | 2.4V to 5.5V | 2.7V to 5.5V |
| Card Emulation | Yes | Yes | Yes | Yes |
| Low Power Card Detection | Yes | Yes | Yes | Yes |
| Automatic Antenna Tuning | Yes | Yes | Yes | Yes |
主要差異化特點
- Higher output power (1.4W) compared to ST25R3917B (1W) (對比ST25R3917B)
- Improved sensitivity and lower power consumption compared to ST25R3916 (對比ST25R3916)
- Same package and pinout as ST25R3916, allowing easy upgrade (對比ST25R3916)
設計說明
For optimal RF performance, place the ST25R3916B close to the antenna and keep the RF trace short and impedance-controlled. Use a ground plane beneath the device and ensure proper decoupling with 100nF and 10uF capacitors on the supply pins. Follow the antenna design guidelines in the datasheet to achieve the desired read range.
The ST25R3916B can draw significant current during transmission (up to 1.4W output). Ensure the power supply can handle peak current demands and use a low-ESR capacitor bank near the VDD_TX pin. Consider using a separate supply for the TX stage to avoid voltage drops affecting the digital circuitry.
A common pitfall is improper antenna matching, which can reduce read range and cause EMC issues. Use the automatic antenna tuning feature and verify the antenna impedance with a network analyzer. Also, ensure the SPI lines are not routed near the RF section to avoid interference.
合規資訊
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified.
