AS3956 NFC Sensor Interface Tag IC

NFC to SPI/I²C Interface Tag IC


  • Fully compliant to NFC Forum T2T standalone, T4T with ext. microcontroller & ISO 14443A
  • Tunneling and extended modes with SPI and I²C for fast data transfer
  • 4kbit industrial grade EEPROM memory
  • Energy harvesting up to 5mA @ 4.5V
  • Available as bare die, thin WL-CSP (0.3mm height), MLPD-10


  • Standalone NFC passive tag functionality
  • High endurance EEPROM memory reaches industrial grade quality
  • Allows battery-less designs
  • Fast system integration and high speed data transfer
  • No external component required

Product parameters

Frequency [MHz] 13.56
Protocol NFC Forum compliance and ISO 14443A compliance and EMVCo
Supply Voltage [V] 1.65 to 5.5
Temperature Range [°C] -40 to +125
Interface ISO14443A \ SPI slave interface up to 5 Mbit/s \ I²C slave interface up to 1 Mbit/s
EEPROM [kbit]
EEPROM [kbit] 4
Features Type 2 Tag \ Type 4 Tag emulation \ Passive wake-up interrupt \ 32-bit password memory protection \ Silent mode \ Energy harvesting 5mA @ 4.5V
Data Rate [kbit/s] 106
Package MLPD-10, WL-CSP

General Description

AS3956 Dynamic NFC Sensor Tag IC meets industrial-grade quality standards and provides very high reliability in mission-critical applications and in end products with a long operating lifetime.

Thanks to a high sensitivity ISO14443A frontend and high integrated resonance capacitor, AS3956 offers standalone NFC passive tag functionality in a small form factor. The AS3956 dynamic tag acts as a contactless bridge between sensors and any NFC reader, such as a smartphone, through a host microcontroller.

Fast system integration and high speed data transfer are guaranteed by the available SPI and I²C interfaces and by optimized protocols (Tunneling mode and Extended mode), allowing bidirectional communication between the device microcontroller and an external NFC compliant device or ISO14443A reader device. AS3956 is able to operate fully powered by the RF field, without any external supply. This, combined with an advanced energy harvesting feature, greatly increases battery life time or even allows battery-less designs.

Not Recommended for New Designs
ams AG is discontinuing production of this device.

This product suits for the following applications:

  • Industrial and Internet of Things (IoT) applications exposed to harsh operating conditions and extreme temperatures ranging from -40°C to +125°C
  • Products requiring an extended operating lifetime, such as HVAC equipment, medical and healthcare devices, wireless sensors for civil infrastructure
  • Mission-critical products that require a zero failure rate
  • Feature and biometric payment cards

Technical Documents

Type Description Language
Datasheet Document version 1-11 English
User Guide Demokit User Manual English

Environmental Documents

Type Description Language
RoHS Certificate RoHS Certificate_AS3956 English


Type Description Language
EoL Notification AS252x, AS36xx, AS37xx_AS3956 (issued 2019-Sep) English
Product Change Notification PCN37-2018 (AS3956) English
Product Change Notification PCN25-2018 (AS3956) English

Other Information

Type Description Language
Block Diagram AS3956 Block Diagram English
Factsheet Industrial IoT (2017-10) English

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