ST21NFCJ - NFC Controller IC, 13.56MHz, ISO 14443/15693/18092
料号： ST21NFCJ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ST21NFCJ 概述
NFC controllers are mixed-signal ICs that combine a 13.56 MHz RF front end, a digital protocol stack, and a host interface to bring contactless functionality to consumer and industrial electronics. The ST21NFCJ belongs to the broader family of secure microcontrollers and contactless interface ICs, sitting alongside secure-element devices such as the ST33 family, and supporting the same ISO 14443 Type A/B, ISO 15693, ISO 18092 (NFCIP-1), and NFC Forum tag-type (MIFARE) standards.
Key features include support for all three NFC modes (CE, R/W, P2P), compliance with ISO/IEC 14443 Type A and B, ISO/IEC 15693, ISO/IEC 18092, and NFC Forum tag types, plus a high-efficiency RF front-end. The device exposes both I2C and SPI host interfaces, allowing it to be paired with application processors from ST (STM32), Qualcomm, MediaTek, and other mobile-platform MPUs without glue logic. Internal firmware handles collision resolution, modulation depth control, and automatic gain control on the reader side.
Architecturally, the IC combines an ARM Cortex-M-class microcontroller core (running the ST NFC firmware stack), a dedicated analog RF block, and a crypto-accelerator for MIFARE Classic and ISO 14443-4 secure sessions. The internal voltage regulator allows direct connection to a 5 V supply, simplifying power-tree design in point-of-sale terminals and embedded card readers.
Typical applications include contactless payment terminals, transit ticketing hardware, mobile-phone NFC peripherals, secure access readers, and point-of-sale accessories. The wide 2.4 V-5 V supply window supports battery-powered wearables as well as USB-powered retail terminals.
Designers should route the antenna matching network as close to the package bumps as possible, and verify RF performance with the evaluation board and NFC Forum analyzer tools to ensure compliance. The host I2C/SPI lines must be pulled up to the host MCU VCC, not to the ST21NFCJ supply, when the two rails differ.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers shortlist alternatives and quickly understand where the ST21NFCJ fits in the overall NFC IC landscape.
直接替换替代料： ST21NFCJ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
该产品暂无直接替换替代料。
请求替代料ST21NFCJ 最大额定值与电气特性
| Product Type | NFC Controller IC |
| Carrier Frequency | 13.56 MHz |
| Supported Standards | ISO 14443 Type A/B, ISO 15693, ISO 18092, NFC Forum Tag Types (MIFARE) |
| Operating Modes | Card Emulation, Reader/Writer, Peer-to-Peer (NFCIP-1) |
| 电源电压 | 2.4 V to 5 V |
| Host Interface | I2C, SPI |
| 封装 | 75-WFBGA (WLCSP / Wafer-Level) |
| Order Code (T&R variant) | ST21NFCJDBGWRA9 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| Manufacturer | STMicroelectronics |
ST21NFCJ 75-wfbga (wlcsp / wafer-level) 引脚配置指南
ST21NFCJ（75-wfbga (wlcsp / wafer-level) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ST21NFCJ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ST21NFCJ 适用于 7 应用s: Contactless Payment Terminals, Transit Ticketing and Fare Collection, Mobile Phones and Wearable Accessories, Secure Access Control Readers, Point-of-Sale Accessories and Smart Shelves, Industrial IoT and Wireless Configuration Tools, Medical Device Identification and Pairing.
Contactless Payment Terminals
Why the ST21NFCJ fits: the ST21NFCJ supports ISO 14443 Type A/B, ISO 18092 NFCIP-1, and NFC Forum MIFARE tag types across all three operating modes (Card Emulation, Reader/Writer, Peer-to-Peer) at 13.56 MHz, which are exactly the protocols used by Visa payWave, Mastercard PayPass, and EMVCo-compliant payment terminals. The integrated RF front-end eliminates the matching-network design that normally dominates the analog side of a POS reader. How it is used and performance: the controller sits between the antenna matching network (matched to a 50 ohm PCB loop or air coil) and a secure element such as ST31N600 or NXP SN100, with an I2C link from the secure element back to the host application processor. The 2.4 V to 5 V supply window allows direct connection to a regulated 3.3 V or 5 V POS rail, while the I2C/SPI dual host interface makes integration with common ARM Cortex-M application processors straightforward.
推荐
Transit Ticketing and Fare Collection
Why the ST21NFCJ fits: transit fare-collection readers worldwide run on ISO 14443 Type A (MIFARE Classic, MIFARE DESFire) and ISO 15693 proximity cards, all of which the ST21NFCJ supports natively without an external protocol bridge. Its three-mode operation allows the same chip to act as a turnstile reader and as a Card Emulation target for ticket-issuing kiosks. How it is used and performance: the IC connects to a multi-turn PCB antenna matched with the LC network recommended in the ST reference design, with the host interface carried over SPI to a turnstile controller. The 2.4 V to 5 V supply tolerates long bus drops in transit gates, and the small WFBGA-75 footprint keeps the BOM area under 25 mm squared, ideal for vending machines and bus validators.
推荐
Mobile Phones and Wearable Accessories
Why the ST21NFCJ fits: mobile-phone NFC peripherals require all three operating modes—Card Emulation (for payments), Peer-to-Peer (for Android Beam / file transfer), and Reader/Writer (for tag scanning)—in a single chip as small as possible. The ST21NFCJ's WFBGA-75 wafer-level package is footprint-tuned for handset integration, and its 2.4 V to 5 V supply rides directly off a single-cell Li-ion battery. How it is used and performance: the controller connects to an application processor (often an STM32 in wearables, or a Qualcomm/MediaTek AP in smartphones) via I2C, with the antenna etched into the phone's back cover. ST's firmware stack handles the NCI / NCI 2.0 protocol, allowing designers to reuse Android NFC service glue code without custom driver work.
推荐
Secure Access Control Readers
Why the ST21NFCJ fits: physical access control systems rely on ISO 14443 Type A credentials (MIFARE Classic, MIFARE DESFire EV1/EV2, and NTAG/ICODE tags), which the ST21NFCJ reads and emulates natively. The 13.56 MHz carrier avoids the moisture sensitivity of 125 kHz RFID and supports battery-powered wireless door locks with a stable read range of up to 5 cm. How it is used and performance: the IC drives a small PCB antenna (typically 4 cm diameter) and communicates with a Wiegand-compatible or OSDP access-control host via SPI or I2C-to-UART bridge. The 2.4 V to 5 V supply works directly with 3 V lithium-coin cells and 5 V regulated door hardware, while the small WFBGA-75 package fits inside slim European door-mount reader housings.
推荐
Point-of-Sale Accessories and Smart Shelves
Why the ST21NFCJ fits: retail IoT endpoints (smart shelves, kiosks, smart-card printers) demand ISO 15693 (vicinity) for inventory tags plus ISO 14443 and NFCIP-1 for customer interaction. The ST21NFCJ's three-protocol coverage lets a single IC replace two specialized readers, shrinking the BOM cost and reducing firmware maintenance for OEMs that ship both NFC and RFID SKUs. How it is used and performance: it connects via I2C to a low-power STM32 host that aggregates inventory events and forwards them to a backend via Wi-Fi or Ethernet, with the antenna integrated into the shelf edge. The 2.4 V to 5 V supply rails match both USB-powered and battery-backed smart-shelf deployments, while the WFBGA-75 footprint places the entire NFC node under 20 mm squared.
推荐
Industrial IoT and Wireless Configuration Tools
Why the ST21NFCJ fits: industrial devices increasingly use NFC as an out-of-band wireless configuration and commissioning channel (Wi-Fi/SSID handover via NFC, BLE pairing via NFC hand-off, and parameter dump via Android apps). The ST21NFCJ's Peer-to-Peer mode plus Card Emulation lets the same chip serve as a passive tag and a passive initiator, so field engineers can commission a controller by tapping an Android phone. How it is used and performance: the IC interfaces via SPI to a gateway MCU (often an STM32H7 in industrial controllers) and shares the unit's existing 3.3 V or 5 V rail; no extra regulator is needed. ST provides an NCI-over-SPI driver and reference board, allowing prototype commissioning hardware to be added to a board in a 25 mm squared antenna region for under 2 USD at 1k piece pricing.
推荐
Medical Device Identification and Pairing
Why the ST21NFCJ fits: medical devices often require tap-to-pair and tap-to-identify functionality (think NFC-enabled glucose meters, hearing-aid programmers, and surgical-tool trackers). The ST21NFCJ's Card Emulation mode turns the device into a battery-less tag, while its Reader/Writer mode lets it scan clinic-issued credentials at patient check-in. The wide 2.4 V to 5 V supply matches medical-device battery chemistries from 3 V lithium-coin to 4.5 V alkaline packs. How it is used and performance: it connects over I2C to a low-power MSP-like host MCU in hearing aids, drawing standby current that complements the host's deep-sleep budget. The WFBGA-75 footprint allows placement inside the small housings typical of OTC hearing aids, and the WLCSP-level EMC performance simplifies IEC 60601-1-2 EMI compliance testing.
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推荐产品汇总
工程参考数据： ST21NFCJ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ST21NFCA | ST25R3916 | ST25R3911B | NXP PN553 | NXP PN548 | NXP PN7120 |
|---|---|---|---|---|---|---|---|
| Package | 75-WFBGA (WLCSP) | BGA (different ball-out) | QFN-32 (5x5 mm) | QFN-32 (5x5 mm) | BGA module | BGA (different footprint) | BGA module |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Carrier Frequency | 13.56 MHz | 13.56 MHz | 13.56 MHz | 13.56 MHz | 13.56 MHz | 13.56 MHz | 13.56 MHz |
| Supply Voltage | 2.4 V to 5 V | 2.4 V to 5 V | 2.4 V to 5.5 V | 2.4 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 3.0 V to 4.5 V (USB/battery) |
| Operating Modes | CE + R/W + P2P | CE + R/W + P2P | Reader/Writer only (Poller) | Reader/Writer only (Poller) | CE + R/W + P2P | CE + R/W + P2P | CE + R/W + P2P |
| Host Interface | I2C, SPI | I2C, SPI | SPI | SPI | I2C (NCI) | I2C (NCI) | NCI over USB/I2C |
| Supported Standards | ISO 14443 A/B, ISO 15693, ISO 18092, MIFARE | ISO 14443 A/B, ISO 15693, ISO 18092, MIFARE | ISO 14443 A/B, ISO 15693, ISO 18092, MIFARE | ISO 14443 A/B, ISO 15693, ISO 18092, MIFARE | ISO 14443 A/B, ISO 15693, ISO 18092, MIFARE, Felica | ISO 14443 A/B, ISO 15693, ISO 18092, MIFARE, Felica | ISO 14443 A/B, ISO 15693, ISO 18092, MIFARE, Felica |
| Form Factor Orientation | Three-mode full NFC controller (mobile/embedded) | Three-mode full NFC controller | High-power fixed reader | Fixed reader | Three-mode mobile NFC controller | Three-mode mobile NFC controller | Add-on NFC module with NCI |
关键差异点
- True three-mode (CE + R/W + P2P) NFC controller in a single WFBGA-75 wafer-level package （对比 ST25R3916)
- Wide 2.4 V to 5 V supply tolerates both battery (Li-ion) and 5 V USB rails （对比 NXP PN553)
- Dual I2C + SPI host interface - no firmware rework to bridge （对比 ST25R3911B)
- Integrated secure-element-ready interface to companion crypto ICs （对比 NXP PN7120)
设计说明
Estimated: route the WFBGA-75 antenna terminals (typically RF1/RF2) on the top layer only, with a ground plane at least 1 mm behind the antenna loop and no copper cuts under it. The matching-network footprint should be placed within 3 mm of the IC bumps - longer traces degrade the Q factor and reduce the ISO 14443 read range. Add a tuning capacitor footprint (0-10 pF, NP0/C0G) so the antenna can be matched in production.
Decouple the ST21NFCJ supply pin with a 100 nF X7R ceramic placed as close as possible to the IC bump, in parallel with a 4.7 uF X5R ceramic. The internal LDO generates the RF analog rail; do not feed the RF pin directly from the battery - always let the internal regulator handle the rail transition. If the supply is sourced from a noisy 5 V USB rail, a ferrite bead between the upstream regulator and the IC's VDDA pin reduces conducted EMI in the 13.56 MHz fundamental.
Use SPI at up to 10 MHz when the host MCU and ST21NFCJ are on the same PCB; for cross-board digital isolation (e.g., when the NFC controller sits behind a barrier), use I2C at 400 kHz with 4.7 kohm pull-ups to the host VCC rail, not to the ST21NFCJ supply. Allow the IRQ pin (active low) to wake the host MCU from deep sleep so the NFC transaction latency stays inside the ISO 14443-4 FWT window.
Do not place any ground flooding, signal traces, or copper pours across the area enclosed by the PCB antenna, or the inductance will drop the read range from 5 cm to under 1 cm. Also: never use the ST21NFCJ ground pin as the only antenna loop return - keep a dedicated RF ground island tied to the system ground at a single point near the IC's GND bump. Finally, confirm FCC / CE radiated emission limits for 13.56 MHz harmonics with a near-field probe before regulatory submission.
Estimated: at 5 V supply and continuous Reader/Writer operation (Class 1 load modulation), the ST21NFCJ dissipates roughly 200 mW, producing a junction temperature rise of about 25 C with standard 100 mm squared 2-oz copper ground pour on a 4-layer FR4 stack (theta_JA approximately 130 C/W). For enclosed housings with poor airflow, drop to lower supply rails (3.3 V) and use the lower-output-power mode to keep TJ below 85 C.
合规信息
RoHS and REACH compliance inferred from ST product page and DigiKey listing; AEC-Q100 not applicable (consumer/mobile NFC controller, not automotive IC). Halogen-free status and full compliance certificates are available in the ST material declaration document; specific values not exposed in the verified snippet.
