STMicroelectronics ST25DV04K-IER8T3

Overview

ST25DV04K-IER8T3 from STMicroelectronics is a dynamic NFC/RFID tag IC with 4-Kbit EEPROM, dual I²C and ISO/IEC 15693 contactless interfaces, 1.8–5.5 V supply, 256-byte fast-transfer buffer, and energy harvesting output (V_EH). It serves as a secure, field-powered memory bridge in smart labels, industrial asset tags, and IoT sensor nodes requiring battery-free data exchange.

For engineers reviewing the ST25DV04K-IER8T3 datasheet, ST25DV04K-IER8T3 pinout, ST25DV04K-IER8T3 application, or ST25DV04K-IER8T3 equivalent, key selection criteria include RF/I²C coexistence timing, GPO interrupt configuration (open-drain), 4-Kbit user memory partitioning, and ISO/IEC 15693 compliance for NFC Forum Type 5 certification.

Technical Context

The device implements a dual-interface architecture: I²C operates at up to 1 MHz with byte-addressed EEPROM access, while the RF interface complies fully with ISO/IEC 15693 (13.56 MHz) and supports all modulation, coding, sub-carrier, and data rate modes-including custom fast read at 53 Kbit/s. Internal 28.5 pF tuning capacitance eliminates external matching components.

Memory is organized into four configurable user areas (each protectable by independent 64-bit passwords), a 256-byte volatile mailbox for fast I²C↔RF transfers, dynamic registers for real-time status, and system configuration space storing UID, AFI, DSFID, and security keys. The GPO pin signals RF field change, memory write completion, or mailbox activity via programmable open-drain output.

Key Specifications

Pinout & Package

ST25DV04K-IER8T3 is supplied in TSSOP8 package (ECOPACK2, RoHS-compliant), featuring open-drain GPO output and no LPD/VDCG pins - confirming it is the -IE variant per ST's naming convention (vs. -JF with CMOS GPO and VDCG).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST25DV16K-IER8T3, this 4-Kbit variant reduces memory cost and power during RF writes; versus NT3H2111, it delivers superior security architecture, energy harvesting capability, and ISO/IEC 15693 interoperability for industrial NFC deployments.

Availability

ST25DV04K-IER8T3 is available at Aetrix Electronics and suitable for smart industrial labels, secure asset tracking tags, IoT sensor node configuration, and NFC-enabled consumer electronics requiring stable component supply and full NFC Forum Type 5 certification.

Supply support for ST25DV04K-IER8T3 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 microcontrollers, power management, sensors, and secure connectivity solutions for industrial, automotive, and consumer markets.

The ST25DV family targets hybrid wired/wireless embedded systems - designed to unify I²C-based host control with contactless NFC interaction in space-constrained, battery-free, or security-critical applications.

FAQ

What is the function of the V_EH pin, and what load can it drive?

The V_EH pin delivers unregulated analog voltage derived from the RF field during energy harvesting mode. Its output is high-impedance when RF field strength is insufficient or EH is disabled. Per DS10925 Rev 11, it sources up to 3.3 V at ~5 mA peak under optimal field conditions but requires external regulation for MCU supply. It is not intended to drive loads exceeding 10 µA continuously without supplemental buffering.

How does the GPO pin behave in ST25DV04K-IER8T3, and what external components are required?

ST25DV04K-IER8T3 features an open-drain GPO pin configured by default as an RF field change detector. It pulls low on events like field detection or memory write completion. An external pull-up resistor (>4.7 kΩ to V_CC) is mandatory for proper logic-level signaling. No VDCG pin is present - confirming this is the -IE variant, unlike -JF versions requiring VDCG for CMOS output.

Can the ST25DV04K-IER8T3 operate without a wired V_CC supply?

Yes - the device operates in pure contactless mode using only RF power. The internal rectifier and regulator derive all operating voltage from the 13.56 MHz carrier field applied to AC0/AC1. Wired V_CC is optional and used only when simultaneous I²C access is needed while RF is active, or to reduce boot time. In RF-only mode, V_CC may be left unconnected or tied to V_SS.

What memory protection mechanisms are implemented, and how are passwords managed?

The ST25DV04K-IER8T3 implements three 64-bit RF passwords and one 64-bit I²C password for user memory areas, plus a dedicated 64-bit RF configuration password. Passwords are stored in protected system configuration space and accessed only after opening a security session via specific RF or I²C commands. Area boundaries (ENDA registers) are also password-protected, preventing unauthorized re-partitioning of memory zones.