STMicroelectronics ST25TN01K-AFH5

Overview

ST25TN01K-AFH5 from STMicroelectronics is an NFC Forum Type 2 tag IC with integrated 208-byte EEPROM, TruST25 digital signature, Augmented NDEF, and kill-mode privacy protection. It operates contactlessly via 13.56 MHz RF field harvesting, supports 106 kbit/s data transfer, features 7-byte UID, 50 pF internal tuning capacitance, and is rated for -40 °C to +85 °C operation in industrial NFC tagging applications.

For engineers reviewing the ST25TN01K-AFH5 datasheet, ST25TN01K-AFH5 pinout, ST25TN01K-AFH5 application, or ST25TN01K-AFH5 equivalent, key selection criteria include NFC Forum T2T compliance, irreversible block-level write locks, dynamic NDEF message generation without EEPROM rewrite, and configurable kill password enforcement for GDPR-aligned deactivation.

Technical Context

The ST25TN01K-AFH5 implements a fully autonomous ISO/IEC 14443-2/3 Type A analog front-end with on-die 50 pF tuning capacitance, eliminating external matching components. Its digital unit executes NFC Forum Type 2 tag protocol stack-including anticollision, capability container (CC) handling, and NDEF message framing-without host intervention.

Memory control logic enforces one-time-programmable (OTP) lock bits across static, dynamic, and system lock areas, with granularity ranging from 1-block (4 bytes) to 2-block (8 bytes). Augmented NDEF (ANDEF) operates via virtual memory overlay: real-time UID ASCII insertion and unique tap code (UTC) generation occur during READ responses, not EEPROM writes.

Key Specifications

Pinout & Package

ST25TN01K-AFH5 is supplied in UFDFPN5 package (1.7 × 1.4 mm), RoHS-compliant ECOPACK2 delivery form. Only two terminals - AC0 and AC1 - are functional; all others are unconnected die pads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NFC Type 2 tag applications.

Compared with NT3H2111W0FHKH and ST25DV02K-IER, ST25TN01K-AFH5 uniquely combines passive-only operation, hardware-enforced privacy (kill), and dynamic content generation (ANDEF + UTC) in a compact 1.7 × 1.4 mm footprint - making it optimal for space-constrained, security-critical, single-interface NFC tagging.

Availability

ST25TN01K-AFH5 is available at Aetrix Electronics and suitable for industrial asset tagging, smart packaging, medical device labeling, and secure product authentication requiring stable component supply and full NFC Forum Type 2 compliance.

Supply support for ST25TN01K-AFH5 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, sensors, power ICs, and secure NFC solutions for industrial, automotive, and consumer markets.

ST25TN01K-AFH5 belongs to the ST25 NFC tag IC product line, engineered specifically for secure, maintenance-free, and standards-compliant passive RFID/NFC applications in harsh environments and regulated industries.

FAQ

Does ST25TN01K-AFH5 require an external capacitor for 13.56 MHz operation?

No. The device integrates a factory-trimmed 50 pF internal tuning capacitance, enabling direct connection to a printed loop antenna without external matching components. This simplifies PCB layout, reduces bill-of-materials cost, and improves RF performance consistency across production batches.

How is the kill function activated, and can it be reversed?

Kill is triggered by writing the 4-byte kill password (default 0x00000000) to block address 0x30 (48 decimal). Once executed, the device enters a permanent KILLED state where all RF commands are ignored. There is no hardware or software mechanism to restore functionality - this ensures irreversible privacy compliance per GDPR requirements.

What distinguishes Augmented NDEF (ANDEF) from standard NDEF on this IC?

ANDEF dynamically injects UID ASCII and a unique tap code (UTC) into NDEF responses during READ operations - without altering EEPROM contents. Standard NDEF requires pre-written static messages. This enables per-tap uniqueness, session binding, and tamper-resistant analytics while preserving EEPROM endurance and simplifying cloud-side message parsing.

Can the 7-byte UID be read or modified after programming?

The UID is factory-programmed, read-only, and compliant with ISO/IEC 14443-3 double-size UID format. It is accessible via standard READ commands at block 0–1 but cannot be altered, erased, or overwritten under any condition - ensuring persistent, unforgeable device identity for authentication and traceability systems.