STMicroelectronics ST25TA512B-AC6F5

Overview

ST25TA512B-AC6F5 from STMicroelectronics is an NFC Forum Type 4 Tag IC compliant with ISO/IEC 14443 Type A, featuring 512-bit (64-byte) user EEPROM, 7-byte UID, 128-bit password protection, and TruST25™ digital signature for anti-cloning. It operates contactlessly at 13.56 MHz with 106 kbps data rate and internal 50 pF tuning capacitance, deployed in secure product authentication and smart packaging applications.

For engineers reviewing the ST25TA512B-AC6F5 datasheet, ST25TA512B-AC6F5 pinout, ST25TA512B-AC6F5 application, or ST25TA512B-AC6F5 equivalent, key selection criteria include NFC Type 4 compliance, NDEF file support, 200-year data retention, 1M-cycle endurance, and TruST25™-enabled origin verification - all critical for tamper-resistant identity tagging in industrial and consumer goods.

Technical Context

The ST25TA512B implements a fully autonomous RF-powered architecture with analog front-end tuned to 13.56 MHz, supporting ISO/IEC 14443-A framing and NFC Forum Type 4 Tag command set. Its digital unit handles NDEF message parsing, CC file validation, and system-level security operations including password-based access control and event counter management.

Unlike variants with GPO (e.g., ST25TA02KB-D/P), the ST25TA512B lacks VDCG, VSS, and GPO pins - it is a pure 2-pin antenna-interface device. Memory access follows strict NFC Type 4 procedures: ReadBinary/UpdateBinary commands operate within defined MLe (255 bytes) and MLc (54 bytes) limits, with chaining support for larger transfers.

Key Specifications

Pinout & Package

UFDFPN5 package (1.7 × 1.4 mm, 0.4 mm pitch) with exposed thermal pad; optimized for ultra-thin label and inlay integration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NFC Type 4 tag applications.

Compared with ST25TA512B-AC6F5, ST25TV512A-AC6F5 delivers higher security assurance through extended TruST25™ signatures and voltage supervision, while NXH3670UK/V1 trades hardware security for lower footprint and cost - making ST25TA512B the optimal balance of certification, endurance, and proven anti-counterfeit functionality.

Availability

ST25TA512B-AC6F5 is available at Aetrix Electronics and suitable for product authentication, smart packaging, industrial asset tagging, and reusable logistics labeling requiring stable component supply across multi-year production cycles.

Supply support for ST25TA512B-AC6F5 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, specializing in secure microcontrollers, power management, and sensing technologies for industrial, automotive, and IoT markets.

The ST25 NFC tag family targets secure identification and data exchange in resource-constrained environments, emphasizing hardware-enforced authenticity, ultra-low-power RF operation, and seamless integration into thin-form-factor labels and inlays.

FAQ

Does ST25TA512B-AC6F5 require an external antenna matching network?

No. The device integrates 50 pF internal tuning capacitance across AC0/AC1 pins, enabling direct connection to a properly dimensioned printed or wire-wound antenna without discrete capacitors or inductors. Antenna design must target 13.56 MHz resonance with Q-factor optimized for read range and coupling efficiency per ISO/IEC 14443-A requirements.

How is TruST25™ digital signature verified in-system?

TruST25™ signature is generated during wafer fabrication and stored in protected memory. Verification occurs off-chip: a host system reads the signature and UID, then validates them against ST's public key using standard ECDSA routines. No on-tag computation is performed - the signature serves as immutable, factory-issued proof of origin.

Can the 128-bit passwords be changed after initial programming?

Yes. Both read and write passwords can be updated using the ChangePassword command, provided the current password is known and the NDEF file is not in FORBIDDEN state. Passwords remain persistent across RF power cycles and retain their values for 200 years under normal operating conditions.

What happens to the 20-bit event counter during RF field interruption?

The counter employs hardware anti-tearing logic: if an increment operation is interrupted by RF dropout, the EEPROM write sequence rolls back to its pre-increment state, ensuring the counter value remains consistent and never increments spuriously. This guarantees accurate audit trails even in unstable electromagnetic environments.