NXP Semiconductors NT3H1201W0FHKH

Overview

NT3H1201W0FHKH from NXP Semiconductors is an NFC Forum Type 2-compliant contactless + I²C dual-interface IC with energy harvesting, 2 kB user EEPROM, 64-byte SRAM buffer, and configurable field detection pin (FD). It enables zero-power configuration and dynamic NDEF message updates in smart home appliances and healthcare devices.

For engineers reviewing the NT3H1201W0FHKH datasheet, NT3H1201W0FHKH pinout, NT3H1201W0FHKH application, or NT3H1201W0FHKH equivalent, key selection criteria include I²C slave timing (up to 400 kHz), SRAM pass-through mode for RF↔I²C data transfer, field-detection trigger options (RF presence/first communication/selection only), and energy harvesting output (VOUT) capability for powering external microcontrollers.

Technical Context

The NT3H1201W0FHKH integrates a passive 13.56 MHz RF interface compliant with ISO/IEC 14443-3A and NFC Forum Type 2, alongside an active I²C slave interface supporting Standard (100 kHz) and Fast (400 kHz) modes. Its arbitration logic enforces first-come-first-served access between RF and I²C, with status flags indicating EEPROM read/write busy states.

Memory architecture includes 2016-byte EEPROM (1904 bytes user-accessible), 64-byte volatile SRAM mapped at I²C addresses F8h–FBh, and dedicated configuration registers for SRAM mirroring and field-detection event selection. The FD pin operates as an open-drain output triggered by RF activity, while VOUT delivers harvested energy up to 3.3 V for low-power peripherals.

Key Specifications

Pinout & Package

NT3H1201W0FHKH uses the XQFN8 package: plastic, extremely thin quad flat, no leads, 1.6 × 1.6 × 0.6 mm body, 8 terminals. Central thermal pad is unconnected per NXP recommendation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NFC + I²C interface applications.

Compared with NT3H1101W0FHK, NT3H1201W0FHKH doubles user memory capacity without changing footprint or interface behavior; compared with NT3H2201W0FHK, it requires external antenna tuning but offers lower system cost and greater flexibility in RF layout optimization.

Availability

NT3H1201W0FHKH is available at Aetrix Electronics and suitable for smart home appliances, healthcare wearables, and industrial smart meters requiring stable component supply, long-term lifecycle support, and NFC-based zero-power configuration.

Supply support for NT3H1201W0FHKH 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with core expertise in NFC, RFID, and secure element technologies.

The NTAG I²C product line-including NT3H1201W0FHKH-is designed specifically for dual-interface, energy-harvesting NFC applications where contactless commissioning, firmware updates, and secure parameter storage must coexist with minimal power infrastructure.

FAQ

What is the primary function of the FD pin on the NT3H1201W0FHKH?

The FD (Field Detection) pin on the NT3H1201W0FHKH is a configurable open-drain output that signals RF activity to an external host. It can be programmed to assert upon RF field presence, first communication start, or tag selection only-enabling precise wake-up control for low-power microcontrollers. This functionality is critical for zero-power system architectures where the host MCU remains in deep sleep until triggered by NT3H1201W0FHKH.

Does the NT3H1201W0FHKH require an external power supply to operate its I²C interface?

Yes, the NT3H1201W0FHKH requires an external VCC supply (applied to pin 6) to enable its I²C interface, SRAM access, FD pin functionality, and VOUT regulation. While the RF interface operates passively from the NFC reader's field, I²C communication and energy harvesting output depend on this external bias. Without VCC, only RF read/write operations on EEPROM are possible-SRAM and FD remain inactive.

How does the SRAM Pass-through mode work in the NT3H1201W0FHKH?

In Pass-through mode (enabled via PTHRU_ON_OFF register), the 64-byte SRAM of the NT3H1201W0FHKH is mirrored to fixed RF address range 240–255, allowing direct NFC reader access without EEPROM write cycling. This enables high-speed, unlimited-endurance data exchange-for example, uploading sensor logs via I²C and reading them via RF FAST_READ. The mode requires VCC power and must be re-enabled after each power-on reset.

What memory security features does the NT3H1201W0FHKH provide?

The NT3H1201W0FHKH implements layered memory protection: static lock bits (pages 03h–0Fh) and dynamic lock bytes (pages E0h sector 1) enable irreversible RF-level write protection per page or 32-page blocks; the Capability Container supports one-time programmable bits; and manufacturer-programmed 7-byte UID ensures device uniqueness. All locking mechanisms are configurable via both RF and I²C interfaces, with I²C allowing reset of dynamic locks.

Can the NT3H1201W0FHKH be used without an external antenna?

No, the NT3H1201W0FHKH cannot operate its RF interface without an external antenna connected across LA (pin 1) and LB (pin 8). The IC contains no integrated antenna or resonant capacitor-it relies entirely on an externally tuned LC circuit (coil + optional matching capacitor) to achieve 13.56 MHz resonance. Energy harvesting, field detection, and NFC communication all depend on proper antenna coupling to the reader's RF field.