STMicroelectronics ST25DV04K-JFR8D3

Overview

ST25DV04K-JFR8D3 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, 28.5 pF internal tuning capacitance, and fast transfer mode via 256-byte volatile buffer. It serves as a secure, field-powered memory bridge in smart labels, asset tags, and industrial IoT sensors where wired configuration and wireless readout coexist.

For engineers reviewing the ST25DV04K-JFR8D3 datasheet, ST25DV04K-JFR8D3 pinout, ST25DV04K-JFR8D3 application, or ST25DV04K-JFR8D3 equivalent, key selection criteria include RF/I²C dual-interface timing coordination, GPO interrupt configurability for field-change detection, energy harvesting analog output (V_EH), four-zone memory protection with 64-bit passwords, and low-power down (LPD) support in 10-ball/12-pin packages.

Technical Context

The device implements a dual-domain architecture: an I²C slave interface (up to 1 MHz) accesses user memory byte-wise, while the ISO/IEC 15693 RF interface accesses memory in 4-byte blocks at up to 53 Kbit/s. Its analog front end includes integrated 28.5 pF tuning capacitance and supports all ISO/IEC 15693 modulation/coding modes.

Memory management uses four configurable, password-protected user areas (each with independent 64-bit RF/I²C read/write passwords), plus system configuration registers secured by dedicated 64-bit passwords. The 256-byte fast transfer buffer enables deterministic data exchange between RF and I²C domains without host polling.

Key Specifications

Pinout & Package

ST25DV04K-JFR8D3 is packaged in UFDFPN8 (8-pin, 2 × 2 mm, 0.5 mm pitch), RoHS-compliant ECOPACK2, with open-drain GPO output and no LPD/VDCG pins - distinguishing it from JF-series CMOS-output variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST25DV16K-JFR8D3, this part offers reduced memory but identical dual-interface timing, security, and power features - ideal for space-constrained designs needing minimal persistent storage. Versus NXH3670UK, ST25DV04K-JFR8D3 adds critical I²C configurability and 2× faster RF transfer, enabling hybrid wired/wireless system architectures.

Availability

ST25DV04K-JFR8D3 is available at Aetrix Electronics and suitable for smart industrial labels, secure asset tracking tags, wireless sensor calibration modules, and NFC-enabled consumer electronics requiring stable component supply across automotive-grade temperature ranges and long-life deployments.

Supply support for ST25DV04K-JFR8D3 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 management 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 to unify wired configuration flexibility with contactless interoperability - targeting applications where secure, battery-free, field-updatable memory is essential.

FAQ

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

V_EH is an unregulated analog output derived from the RF field's rectified voltage. It delivers usable power only when the RF field strength exceeds the energy harvesting threshold (~2–3 A/m). Typical output is 1.2–3.3 V into ≤10 µA loads - sufficient to bias low-power comparators or temperature sensors but not microcontrollers. No regulation or current limiting is provided; external filtering is recommended.

How does the fast transfer mode buffer operate between RF and I²C domains?

The 256-byte volatile buffer acts as a mailbox: I²C writes data to the buffer, then triggers an RF-side "mailbox ready" flag; RF reads the buffer and clears the flag. Conversely, RF writes trigger an I²C-accessible "data available" interrupt on GPO. No shared memory addressing or arbitration logic is needed - the buffer is explicitly managed via dedicated commands in both interfaces.

Can the GPO pin be used to wake a microcontroller from deep sleep?

Yes - GPO is configurable to assert on RF field detection, memory write completion, or fast transfer readiness. In open-drain mode (this variant), it pulls low upon event occurrence. When tied to a GPIO with interrupt capability and external pull-up, it reliably wakes an MCU from STOP2 or Standby modes. Latency is <10 µs after RF field stabilization, confirmed in DS10925 Rev 11 Section 5.2.

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

User memory is divided into four zones, each protected by independent 64-bit RF and I²C passwords. System configuration (including UID, AFI, DSFID) is secured by a separate 64-bit RF/I²C configuration password. Passwords are stored in dedicated EEPROM blocks within the system configuration area and are written only after opening a secure session - preventing accidental or unauthorized overwrite during normal operation.