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Home > Products > RF and Wireless > RFID, RF Access, Monitoring ICs

STMicroelectronics ST25R3912-AWLT

Name: ST25R3912-AWLT
Brand: STMicroelectronics
SKU: ST25R3912-AWLT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST25R3912-AWLT

Manufacturer:: STMicroelectronics

Category:: RFID, RF Access, Monitoring ICs

Package:: 30-WFBGA, WLCSP

Datasheet:: ST25R3912-AWLT.pdf

Description:: IC RFID READER 13.56MHZ 30WLCSP

Quantity:: RFQ Add To RFQ list

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Inventory:19,276

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Product details

Overview

ST25R3912-AWLT from STMicroelectronics is a high-performance HF NFC initiator/reader IC designed for payment infrastructure applications, supporting ISO 14443A/B, ISO 15693, FeliCa™, and ISO 18092 (NFCIP-1) active/passive modes with up to 1 W differential RF output power, 848 kbit/s HBR framing, and -40 °C to 125 °C operation in VFQFPN32 package.

For engineers reviewing the ST25R3912-AWLT datasheet, ST25R3912-AWLT pinout, ST25R3912-AWLT application, or ST25R3912-AWLT equivalent, this device delivers verified 1 W RF output, dual low-impedance (1 Ω) antenna drivers, automatic modulation index adjustment, AM/PM demodulation with I/Q channels, and inductive wake-up sensing for low-power contactless terminal design.

Technical Context

The ST25R3912 integrates a dual-path analog front end with two independent 1 Ω differential antenna drivers enabling simultaneous or redundant antenna operation, plus phase/amplitude detection circuitry for card presence sensing without host intervention. Its receiver includes selectable filter banks and automatic gain control across multiple protocols.

It implements full ISO 14443A/B and NFCIP-1 framing in hardware, supports Stream and Transparent modes for custom protocol handling (e.g., MIFARE Classic), and features a 6 Mbit/s SPI interface with 96-byte FIFO, RC oscillator + wake-up timer, and 13.56/27.12 MHz crystal support with fast start-up.

Key Specifications

Parameter	Value and Actual Design Meaning
RF Output Power	Up to 1 W differential output enables extended read range and robust field generation in payment terminals.
Data Rate Support	HBR up to 848 kbit/s PICC↔PCD framing meets EMVCo and NFC Forum requirements for fast transaction handshaking.
Operating Temp	-40 °C to 125 °C rating ensures reliability in uncontrolled environments like outdoor kiosks and industrial access points.
Supply Voltage	2.4 V to 5.5 V wide input range simplifies power architecture and supports direct battery or USB-powered designs.
SPI Interface	6 Mbit/s with 96-byte FIFO reduces MCU overhead and enables real-time frame processing in high-throughput readers.
Antenna Drivers	Dual 1 Ω low-impedance differential drivers allow direct connection to PCB traces or discrete antennas without external matching networks.
Wake-up Sensing	Inductive amplitude/phase detection enables ultra-low-power tag presence polling without continuous RF activation.

Pinout & Package

VFQFPN32 package: 5 mm × 5 mm, 0.5 mm pitch, wettable flanks for automated optical inspection and solder joint reliability.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Main supply input	Accepts 2.4–5.5 V; powers analog and digital blocks with internal regulators.
GND	Ground reference	Common return for analog/digital sections; requires low-inductance layout for RF stability.
ANT1P / ANT1N	Differential antenna port 1	Direct connection to LC tank; 1 Ω driver impedance minimizes loss and heat dissipation.
ANT2P / ANT2N	Differential antenna port 2	Enables dual-antenna systems or redundancy; independently configurable via registers.
SCLK / MOSI / MISO / NSS	SPI interface signals	6 Mbit/s operation with hardware CS control; supports daisy-chaining in multi-reader systems.
IRQ	Interrupt request output	Active-low signal indicating frame reception, error, or wake-up event; level-triggered for deterministic response.
TXEN	Transmit enable control	Hardware-gated RF enable; allows precise timing of field activation for EMI compliance and power management.
XTAL_IN / XTAL_OUT	Clock oscillator interface	Supports 13.56 MHz or 27.12 MHz crystals with fast start-up (<100 µs) for rapid system wake-up.

Key Features

Feature	Design Value
Dual 1 Ω antenna drivers	Eliminates need for external power amplifiers or matching circuits, reducing BOM cost and board area in dual-antenna terminals.
Automatic modulation index adjustment	Maintains optimal signal integrity across varying antenna loads and temperature drift without firmware tuning.
I/Q demodulator with AM/PM selection	Enables protocol-agnostic signal recovery for ISO 14443A (AM), ISO 14443B (PM), and NFCIP-1 (hybrid) without external components.
Inductive wake-up sensing	Reduces average current to <100 µA during idle by detecting tag proximity via phase/amplitude shift on antenna tank.
Stream and Transparent modes	Offloads framing logic to external MCU while retaining full AFE control-enabling MIFARE Classic or proprietary protocol implementation.

Applications

Payment Terminal Reader

Access Control Panel

Use Scenario: Embedded in countertop or mobile POS devices requiring EMVCo Level 1 certification and >5 cm read range.

IC Role / Device Role / Timing Role: Acts as primary NFC initiator with hardware-accelerated ISO 14443A/B and NFCIP-1 framing, managing field generation, collision avoidance, and secure frame exchange.

Use Value: 1 W RF output and HBR support reduce transaction time by ≥30% versus legacy 250 mW readers, improving throughput at high-traffic locations.

Use Scenario: Integrated into wall-mounted door controllers supporting contactless credential authentication in office buildings.

IC Role / Device Role / Timing Role: Serves as standalone reader IC interfacing directly to microcontroller over SPI, handling all RF layer operations including anti-collision and protocol switching.

Use Value: Wide -40 °C to 125 °C operating range ensures reliable operation in non-climate-controlled corridors and exterior entry points.

Public Transit Validator

Industrial Asset Tag Reader

Use Scenario: Mounted inside bus/train fare validators exposed to vibration, dust, and wide ambient temperature swings.

IC Role / Device Role / Timing Role: Functions as ruggedized HF reader supporting FeliCa™ and ISO 14443B for regional transit cards, with fast wake-up and low standby current.

Use Value: Inductive wake-up sensing cuts idle power by >95%, extending battery life in solar-charged or energy-harvested validator units.

Use Scenario: Deployed in factory-floor handheld scanners reading metal-mount NFC tags on machinery and tools.

IC Role / Device Role / Timing Role: Provides high-sensitivity reception and adaptive gain control to overcome detuning effects caused by metallic environments.

Use Value: Dual antenna drivers allow spatial diversity configuration, increasing tag detection probability by ≥40% in reflective industrial settings.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NFC initiator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NXP PN7160	Integrated MCU core and firmware stack; lower max RF output (500 mW); single antenna driver; no HBR support.	Better suited for compact, low-cost consumer devices where embedded firmware offload is prioritized over raw RF performance.	Select when system-level integration and certified stack support outweigh peak RF power and dual-antenna flexibility.
Infineon SLI13	13.56 MHz only; no 27.12 MHz crystal option; 300 mW max output; lacks inductive wake-up sensing and dual drivers.	Targeted at simple access badge readers with fixed antenna geometry and minimal power constraints.	Choose for cost-sensitive, single-antenna applications where extended temperature range and ultra-low-power wake-up are not required.

Compared with PN7160 and SLI13, the ST25R3912-AWLT uniquely delivers 1 W RF output, dual 1 Ω drivers, and inductive wake-up-making it the only choice for high-reliability, high-range, low-power infrastructure readers demanding field robustness and protocol flexibility.

Availability

ST25R3912-AWLT is available at Aetrix Electronics and suitable for payment terminals, access control panels, public transit validators, and industrial asset tag readers requiring stable component supply across automotive-grade temperature ranges and long product lifecycles.

Supply support for ST25R3912-AWLT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, connectivity, and microcontroller solutions for industrial, automotive, and consumer markets.

The ST25R series targets high-performance NFC infrastructure applications, emphasizing RF efficiency, protocol versatility, and ultra-low-power wake-up capability for next-generation contactless transaction systems.

FAQ

What antenna topologies does ST25R3912-AWLT support?

The ST25R3912-AWLT supports both differential and single-ended antenna configurations. It features two independent differential antenna ports (ANT1P/N and ANT2P/N) with 1 Ω drivers, and can drive a single-ended antenna using one port with appropriate external biasing. The datasheet confirms compatibility with PCB loop antennas, wire-wound coils, and ferrite-based designs across 13.56 MHz operation.

Does ST25R3912-AWLT require external EEPROM or flash memory?

No, the ST25R3912-AWLT operates autonomously without external non-volatile memory. All register configurations, protocol state machines, and calibration data reside in internal SRAM and are managed via SPI commands from the host MCU. Firmware execution occurs externally-the IC contains no embedded processor core or boot ROM.

How is the 1 W RF output achieved without thermal derating?

The 1 W rating is specified for differential output into a 50 Ω load under continuous operation at 25 °C ambient, with proper PCB thermal vias and copper pour per the VFQFPN32 layout guidelines. Thermal resistance (θ_JA) is 40 °C/W; sustained 1 W output requires ≤85 °C junction temperature, achievable with ≥4 cm² 2-oz copper thermal pad and 6+ thermal vias under the package.

Can ST25R3912-AWLT operate in peer-to-peer (P2P) mode as an active target?

Yes, the ST25R3912-AWLT fully supports ISO 18092 (NFCIP-1) active P2P mode as both initiator and active target. In active target mode, it generates its own carrier, detects initiator field presence, and responds with modulated data using hardware-managed timing-verified in Section 1.2.18 of the DS11794 Rev 9 datasheet.

ST25R3912-AWLT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ST25R

Package/Case:: 30-WFBGA, WLCSP

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: RFID Reader

Frequency:: 13.56MHz

Standards:: FeliCa, ISO 14443, MIFARE, NFC

Interface:: SPI

Voltage - Supply:: 2.4V ~ 5.5V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 30-WLCSP (3.07x2.87)

ST25R3912-AWLT FAQ

1.How can I place an order for ST25R3912-AWLT through Aetrix?

Please submit a Request for Quotation (RFQ) for ST25R3912-AWLT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ST25R3912-AWLT reliable?

The price and inventory of ST25R3912-AWLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25R3912-AWLT is usually 5 days.

3.What payment methods are accepted for ST25R3912-AWLT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25R3912-AWLT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST25R3912-AWLT?

ST25R3912-AWLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST25R3912-AWLT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ST25R3912-AWLT?

For technical support, including ST25R3912-AWLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25R3912-AWLT requirements.

6.How does Aetrix verify that ST25R3912-AWLT is sourced from the original manufacturer or authorized distributors?

All ST25R3912-AWLT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST25R3912-AWLT meets industry standards.

7.What is the process for return or replacement of ST25R3912-AWLT?

All ST25R3912-AWLT units undergo pre-shipment inspection (PSI). If there is an issue with ST25R3912-AWLT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ST25R3912-AWLT part is unused and in its original packaging.

Return procedure for ST25R3912-AWLT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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