STMicroelectronics ST25DV04K-IER6C3

Overview

ST25DV04K-IER6C3 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 operates as a secure, field-powered memory node in smart labels, asset tags, and industrial IoT sensors requiring bidirectional wired/wireless data exchange.

For engineers reviewing the ST25DV04K-IER6C3 datasheet, ST25DV04K-IER6C3 pinout, ST25DV04K-IER6C3 application, or ST25DV04K-IER6C3 equivalent, key selection criteria include RF/I²C coexistence timing, GPO event configuration (field change, write completion), password-protected memory segmentation, and LPD-enabled low-power mode support in 10-ball/12-pin packages.

Technical Context

The device implements a dual-domain architecture: an I²C slave interface (up to 1 MHz) for host-controlled byte-level EEPROM access and an ISO/IEC 15693-compliant RF interface supporting 26/53 kbit/s read rates and block-level (4-byte) operations. Its internal 28.5 pF tuning capacitance eliminates external matching components for standard antenna designs.

Memory management includes four configurable user areas protected by three 64-bit RF passwords and one 64-bit I²C password; system configuration is secured by a dedicated 64-bit RF/I²C password. Fast Transfer Mode uses a 256-byte volatile mailbox to synchronize data between RF and I²C domains without host polling.

Key Specifications

Pinout & Package

ST25DV04K-IER6C3 is packaged in UFDFPN8 (8-pin, 2 × 2 mm, 0.5 mm pitch), RoHS-compliant ECOPACK2. This variant features open-drain GPO output and lacks LPD/VDCG pins - confirming it is the -IE suffix version per ST's naming convention (vs. -JF with CMOS GPO and LPD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST25DV16K-IER6C3, this part trades memory depth for cost and footprint; compared with NXH3670UK, it sacrifices antenna integration for field-tunable RF performance and energy harvesting capability - making it optimal for ruggedized, field-deployable systems requiring flexible power and data architecture.

Availability

ST25DV04K-IER6C3 is available at Aetrix Electronics and suitable for smart industrial labels, secure asset tracking tags, wireless sensor node tags, and automotive cabin smart tags requiring stable component supply across multi-year production cycles.

Supply support for ST25DV04K-IER6C3 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, power ICs, sensors, and connectivity solutions for industrial, automotive, and consumer markets.

This device belongs to the ST25 Dynamic NFC/RFID tag product line, engineered specifically for applications demanding simultaneous wired (I²C) and contactless (ISO/IEC 15693) data access with robust security, energy harvesting, and fast domain bridging.

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 carrier field. It operates in high-Z state when RF field strength is insufficient. Per DS10925 Rev 11, it sources up to 5 mA into a resistive load with ≥1.5 V output under typical field conditions - sufficient to power low-quiescent-current comparators or enable pins of ultra-low-power MCUs like STM32L0.

How does the Fast Transfer Mode reduce system latency in sensor logging?

Fast Transfer Mode uses a dedicated 256-byte volatile buffer to stage data between RF and I²C domains. Instead of polling the RF interface for new data, the host MCU reads the buffer via I²C after receiving a GPO interrupt signaling "mailbox ready." This cuts average read latency from ~100 ms (RF polling) to <100 µs (buffer read), critical for time-sensitive environmental monitoring.

Can the GPO pin be configured to signal only RF memory write completion?

Yes. The GPO pin is programmable via the GPO_CTRL register (address 0x20E). Setting bits [3:0] to 0x02 configures it exclusively for "RF Write End" events. No other RF or I²C activity triggers the output - enabling deterministic wake-up of host processors only after secure tag programming completes.

What is the minimum antenna Q-factor required for reliable energy harvesting operation?

Per Section 5.3 of DS10925 Rev 11, reliable V_EH output requires antenna Q ≥ 25 at 13.56 MHz with coupling factor k ≥ 0.1 to the reader field. Lower Q values cause excessive RF dissipation, reducing harvested voltage below the 1.2 V threshold needed to activate external circuitry - verified using ST's AN4907 antenna design guidelines.