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AS3911B NFC/HF Reader

High performance HF/NFC reader IC for payment

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The AS3911B is a high performance NFC Reader IC ideal for traditional EMVco as well as smartphone and µSD card payment transaction using ALM (Active Load Modulation). Unique features include antenna auto tuning, dynamic RF output power adjustment, active gain control, dynamic squelch, 1.4W of output power and capacitive wake-up.

AS3911B covers all required and still active ISO14443 A & ISO14443 B license as visible in the official ISO standard document ISO/IEC 14443-3

Please be informed that this item will be available for sales on website until January 3rd 2017. For further inquiries, please contact STMicroelectronics.

Key Features

  • Up to 1W of output power
  • Antenna Auto Tuning
  • Capacitive Wakeup
  • Automatic Modulation Depth Adjustment
  • Next generation Receiver stages
  • Dynamic Output Power
  • Active Gain Control
  • Dynamic Squelch

Key Benefits

  • No need for external booster
  • Works in challenging environments
  • Ultralow power wakeup at 5µA
  • Interoperability with type B
  • Best interoperability with ALM devices on the market
  • Achieve min/max power limits easier
  • Optimal performance from weak to strong card response
  • Improved noise immunity

Product Facts

Protocols supported / Standard [ ] ISO 14443A/B (848kbps)
ISO 15693
ISO 18092 (NFC active)
Frequency [MHz] 13.56
Antenna management [ ]
Wakeup [ ] Capacitive & Inductive
Closed loop modulation depth adjustment
Max. output power [mW] 1000
Datarate [kbps] up to 6800 (VHBR)
Supply voltage [V] 2.4 - 5.5
Temperature range [°C] -40 to +125
Package QFN-32 (5x5)
ISM Range [MHz]
TX Modulation
Sensitivity [dBm]
Output Power [dBm]
Link Frequencies Supported [kHz]
Coding [V]

Additional Information


The AS3911B is suitable for a wide range of applications including

  • EMVco payment terminals
  • Phone & µSD/Sim payment terminals
  • Access Control
  • Automotive
  • NFC Infrastructure and
  • Ticketing