STMicroelectronics ST25DV04K-IER6T3

Overview

ST25DV04K-IER6T3 from STMicroelectronics is a dynamic NFC/RFID tag IC with 4-Kbit EEPROM, dual-interface operation (I²C + ISO/IEC 15693 RF), and fast transfer mode via 256-byte volatile buffer. It supports 1 MHz I²C, 1.8–5.5 V supply, NFC Forum Type 5 certification, and energy harvesting output (V_EH). Used in smart labels, industrial asset tagging, and secure configuration storage where contactless read/write coexists with wired host control.

For engineers reviewing the ST25DV04K-IER6T3 datasheet, ST25DV04K-IER6T3 pinout, ST25DV04K-IER6T3 application, or ST25DV04K-IER6T3 equivalent, key selection criteria include RF/I²C dual-access memory mapping, GPO event configurability (field change, write completion), password-protected memory segmentation, and package-specific LPD low-power mode support in WLCSP10 and UFDFPN12 variants.

Technical Context

The device implements a dual-domain architecture: I²C interface accesses user memory byte-wise (up to 512 bytes), while RF interface accesses it block-wise (128 blocks × 4 bytes), with strict alignment enforced at area boundaries. Memory protection uses three 64-bit RF passwords and one 64-bit I²C password per configurable area.

Its RF subsystem complies fully with ISO/IEC 15693 - supporting all modulations, coding schemes, sub-carrier modes, and data rates up to 53 Kbit/s in fast read mode. The integrated 28.5 pF tuning capacitance eliminates external matching components for standard antenna designs.

Key Specifications

Pinout & Package

ST25DV04K-IER6T3 is supplied in TSSOP8 package (8-pin, ECOPACK2 RoHS-compliant), featuring open-drain GPO output and no LPD/VDCG pins. Pin functions are electrically isolated between I²C and RF domains, with AC0/AC1 dedicated exclusively to antenna coil connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-interface NFC tag applications.

Compared with ST25DV16K-IER6T3, this part reduces EEPROM capacity and cost for applications needing ≤512 bytes; versus NXH3670UK/N1E, it adds critical I²C host control and larger memory but requires external antenna design and additional routing.

Availability

ST25DV04K-IER6T3 is available at Aetrix Electronics and suitable for smart label deployment, secure device configuration, RFID-enabled test fixtures, and energy-harvesting sensor nodes requiring stable component supply across industrial and medical product lifecycles.

Supply support for ST25DV04K-IER6T3 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.

ST25DVxxx is part of ST's Dynamic NFC tag product line, engineered specifically for applications demanding simultaneous wired (I²C) and contactless (RF) access to secure, persistent memory - bridging embedded systems and NFC ecosystems.

FAQ

What is the maximum RF data rate supported by ST25DV04K-IER6T3?

The device supports up to 53 Kbit/s in custom fast read mode per ISO/IEC 15693, achieved using optimized modulation and sub-carrier settings. Standard read commands operate at 26.48 Kbit/s (high data rate mode) or 6.62 Kbit/s (low data rate mode), all fully compliant with NFC Forum Type 5 requirements.

Can the GPO pin be used to wake up an external microcontroller?

Yes - GPO can be configured to assert on RF field detection or fast transfer completion. In open-drain mode (as on TSSOP8), it pulls low to signal events; when paired with an external pull-up resistor and interrupt-capable GPIO, it reliably triggers wake-up in ultra-low-power MCUs like STM32L4/L5 series.

How is memory protection implemented across I²C and RF interfaces?

User memory is divided into up to four areas, each protected by independent 64-bit passwords: three for RF read/write access and one for I²C write access. Area boundaries are defined by ENDA registers; crossing boundaries returns error codes (0Fh on RF, NACK on I²C), enforcing strict access isolation.

Does ST25DV04K-IER6T3 require external tuning capacitors for the RF antenna?

No - the device integrates a 28.5 pF internal tuning capacitance, eliminating need for external capacitors in most antenna designs. Antenna impedance matching is achieved solely through coil inductance and PCB layout; external capacitors are only required if fine-tuning beyond ±10% of nominal resonance is needed.