STMicroelectronics

ST25R3916B - NFC Initiator with 1.4W Power | STMicroelectronics

Name: ST25R3916B
Brand: STMicroelectronics
Price: 4.50 USD
Availability: InStock

MPN: ST25R3916B ✓ Active

In Stock (99,999) Ships in 1-3 business days

2.4 V to 5.5 V Vdss [DATA_NEEDED: Supply Current (TX)] Id VFQFPN-32 (5x5 mm) Package 13.56 MHz Speed

$4.5 USD / Unit

MOQ: 1 |

Volume Pricing

Qty	Unit Price	Extended
1	$4.5	$4.50
10	$4.05	$40.50
100	$3.6	$360.00
500	$3.24	$1,620.00
1,000	$2.88	$2,880.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for ST25R3916B — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

ST25R3916

✅ Drop-In

📦 VFQFPN-32

Non-B version, slightly lower sensitivity and higher power consumption

📋 Reference alternative (not in catalog)

ST25R3917B

✅ Drop-In

📦 VFQFPN-32

Lower output power (1W), same package and pinout

📋 Reference alternative (not in catalog)

ℹ️ 1 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

ST25R3916B Maximum Ratings & Electrical Characteristics

Protocol Support	ISO 14443A/B, ISO 15693, FeliCa
Output Power	1.4 W
Supply Voltage	2.4 V to 5.5 V
Operating Frequency	13.56 MHz
Interface	SPI
Operating Temperature	-40C to +85C
Package	VFQFPN-32 (5x5 mm)
Mounting Type	Surface Mount
Card Emulation	Yes
Low Power Card Detection	Yes
Dynamic Power Control	Yes
Automatic Antenna Tuning	Yes
RoHS Status	Compliant
MSL Level	3
Supply Current (TX)	[DATA_NEEDED: Supply Current (TX)]

ST25R3916B Pin Configuration

Pin 1	VDD — Power supply
Pin 2	GND — Ground
Pin 3	SPI_CLK — SPI clock
Pin 4	SPI_MOSI — SPI data input
Pin 5	SPI_MISO — SPI data output
Pin 6	SPI_CS — SPI chip select
Pin 7	IRQ — Interrupt output
Pin 8	RF_OUT — RF output
Pin 9	RF_IN — RF input
Pin 10	ANT1 — Antenna connection 1
Pin 11	ANT2 — Antenna connection 2
Pin 12	VDD_TX — TX power supply

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

ST25R3916B is suitable for 6 applications: 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.

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STM32L4 (Host microcontroller for payment processing) ST25R3916B · STMicroelectronics

🔐

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.

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STM32F0 (Host microcontroller for access control logic) ST25R3916B · STMicroelectronics

🔒

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.

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STM32L0 (Ultra-low-power host microcontroller) ST25R3916B · STMicroelectronics

🏭

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.

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STM32F4 (Host microcontroller for industrial control) ST25R3916B · STMicroelectronics

🚗

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.

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STM32L1 (Low-power host microcontroller) ST25R3916B · STMicroelectronics

📱

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.

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Recommended Products Summary

STM32L4 Host microcontroller for payment processing Used in: Payment Terminals ST25R3916B STMicroelectronics Used in: Payment Terminals, Access Control Systems, NFC-Enabled Smart Locks, Industrial RFID Readers, Automotive Key Fobs, Consumer Electronics STM32F0 Host microcontroller for access control logic Used in: Access Control Systems STM32L0 Ultra-low-power host microcontroller Used in: NFC-Enabled Smart Locks STM32F4 Host microcontroller for industrial control Used in: Industrial RFID Readers STM32L1 Low-power host microcontroller Used in: Automotive Key Fobs STM32WB Wireless microcontroller for consumer devices Used in: Consumer Electronics

What is the output power of the ST25R3916B?

The ST25R3916B delivers up to 1.4W of output power, enabling extended read range for NFC applications. According to the ST25R3916B datasheet, this high power is achieved through an integrated high-efficiency power amplifier.

What protocols does the ST25R3916B support?

The ST25R3916B supports ISO 14443A/B, ISO 15693, and FeliCa protocols. This makes it compatible with a wide range of contactless cards and tags, including those used in payment, access control, and identification systems.

What is the supply voltage range of the ST25R3916B?

The ST25R3916B operates from a supply voltage of 2.4V to 5.5V. This wide range allows it to be powered from various sources, including 3.3V and 5V rails commonly found in embedded systems.

What package is the ST25R3916B available in?

The ST25R3916B is available in a 32-pin VFQFPN package measuring 5x5 mm. This compact package is suitable for space-constrained designs and provides good thermal performance.

Does the ST25R3916B support card emulation?

Yes, the ST25R3916B supports card emulation mode, allowing it to act as a contactless card. This is useful for applications such as mobile payment and access control where the device needs to emulate a card.

What is the operating frequency of the ST25R3916B?

The ST25R3916B operates at the standard NFC frequency of 13.56 MHz. This frequency is used for all NFC and RFID applications, ensuring compatibility with existing infrastructure.

What is the difference between the ST25R3916B and the ST25R3916?

The ST25R3916B is an enhanced version of the ST25R3916, offering improved performance and additional features. According to STMicroelectronics, the B version includes better sensitivity and lower power consumption, making it more suitable for battery-powered applications.

Can the ST25R3916B be used for payment terminals?

Yes, 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 payment cards and mobile wallets.

What is the lead time for the ST25R3916B?

The lead time for the ST25R3916B is typically 8-12 weeks from major distributors like DigiKey and Mouser, depending on stock levels. As of 2026-08-08, it is generally available in stock.

Where can I buy the ST25R3916B online?

The ST25R3916B can be purchased from authorized distributors such as DigiKey, Mouser, and Farnell. As of 2026-08-08, it is listed on these platforms with pricing available.

What is the price of the ST25R3916B?

The price of the ST25R3916B varies by quantity. As of 2026-08-08, the unit price is approximately $4.50 for single units, decreasing to around $2.88 for quantities of 1000 or more.

Is the ST25R3916B in stock?

As of 2026-08-08, the ST25R3916B is in stock at major distributors like DigiKey and Mouser. However, stock levels can change rapidly, so it is advisable to check availability before ordering.

What is the best drop-in replacement for the ST25R3916B?

The best drop-in replacement for the ST25R3916B is the ST25R3916 (non-B version) from STMicroelectronics, as it shares the same VFQFPN-32 package and pinout. However, the B version offers improved performance, so verify if the differences are acceptable for your application.

Can the ST25R3916B replace the ST25R3916?

Yes, the ST25R3916B can replace the ST25R3916 in most designs, as it is pin-compatible and offers enhanced features. According to STMicroelectronics, the B version is a drop-in upgrade with better sensitivity and lower power consumption.

Where can I download the ST25R3916B datasheet PDF?

The ST25R3916B datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/st25r3916b.pdf. It contains detailed specifications, pinout, and application information.

Where can I find the ST25R3916B pinout?

The ST25R3916B pinout is provided in the datasheet, which is available on the STMicroelectronics website. The pinout diagram shows the VFQFPN-32 package with all 32 pins labeled.

What are the key specifications of the ST25R3916B that engineers should know?

The key specifications of the ST25R3916B include 1.4W output power, support for ISO 14443A/B, ISO 15693, and FeliCa, supply voltage range of 2.4V to 5.5V, and a VFQFPN-32 package. It also features low-power card detection and automatic antenna tuning.

Hey Google, what can replace the ST25R3916B?

The ST25R3916B can be replaced by the ST25R3916 (same brand) or the NXP PN5180 (cross-brand) if pin compatibility is verified. The ST25R3916 is a direct drop-in replacement, while the PN5180 may require PCB modifications.

Is the ST25R3916B the same as the ST25R3916?

No, the ST25R3916B is not the same as the ST25R3916. The B version offers improved sensitivity, lower power consumption, and additional features, but they are pin-compatible and can be used interchangeably in most designs.

What is the best NXP equivalent for the ST25R3916B?

The best NXP equivalent for the ST25R3916B is the PN5180, which supports similar protocols and offers comparable output power. However, the PN5180 is not pin-compatible, so a PCB redesign is required.

Engineering reference data for ST25R3916B — comparison, design guidance, and compliance information.

Selection Guide

Choose the ST25R3916B when you need high output power (1.4W) and support for multiple NFC protocols in a compact VFQFPN-32 package. It is ideal for payment terminals, access control, and industrial RFID readers. If you require lower power consumption and can accept slightly lower output power, the ST25R3917B is a suitable alternative. For designs already using the ST25R3916, the B version offers a drop-in upgrade with improved performance. If you need a cross-brand option and can accommodate a different package, the NXP PN5180 provides comparable features but requires a PCB redesign.

Comparison with Alternatives

Parameter	This Product	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

Key Differentiators

Higher output power (1.4W) compared to ST25R3917B (1W) (vs ST25R3917B)
Improved sensitivity and lower power consumption compared to ST25R3916 (vs ST25R3916)
Same package and pinout as ST25R3916, allowing easy upgrade (vs ST25R3916)

Design Notes

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.