RF and Wireless

ST25R3911B-ASWB

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STMicroelectronics

HIGH PERFORMANCE HF READER / NFC INITIATOR WITH 1.4 W SUPPORTING VHBR AND AAT

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DocumentsDS11793 +22

RF and Wireless

ST25R3911B-ASWB

Active

STMicroelectronics

HIGH PERFORMANCE HF READER / NFC INITIATOR WITH 1.4 W SUPPORTING VHBR AND AAT

Deep-Dive with AI

DocumentsDS11793 +22

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	ST25R3911B-ASWB

Frequency	13.56 MHz
Interface	SPI
Mounting Type	Surface Mount
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-40 C
Package / Case	Die
Standards	Mifare, FeliCa, ISO 14443, ISO 18092, ISO 15693, NFC
Supplier Device Package	Wafer
Type	RFID Reader
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	2.4 V

ST25R3911B Series

High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT

Part	Supplier Device Package	Voltage - Supply [Max]	Voltage - Supply [Min]	Interface	Package / Case	Type	Standards	Mounting Type	Frequency	Operating Temperature [Min]	Operating Temperature [Max]
STMicroelectronics ST25R3911B-ASWB	Wafer	5.5 V	2.4 V	SPI	Die	RFID Reader	FeliCa ISO 14443 ISO 15693 ISO 18092 Mifare NFC	Surface Mount	13.56 MHz	-40 C	125 °C

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	N/A	0	$ 3.64

Description

General part information

ST25R3911B Series

The ST25R3911B is a highly integrated NFC Initiator / HF reader IC, including the analog front end (AFE) and a highly integrated data framing system for ISO 18092 (NFCIP-1) initiator, ISO 18092 (NFCIP-1) active target, ISO 14443A and B reader (including high bit rates), ISO 15693 reader and FeliCa™ reader. Implementation of other standard and custom protocols like MIFARE™ Classic is possible using the AFE and implementing framing in the external microcontroller (Stream and Transparent modes).

The ST25R3911B is positioned perfectly for the infrastructure side of the NFC system, where users need optimal RF performance and flexibility combined with low power.

Thanks to automatic antenna tuning (AAT) technology, the device is optimized for applications with directly driven antennas. The ST25R3911B is alone in the domain of HF reader ICs as it contains two differential low impedance (1 Ohm) antenna drivers.