Part Number: ST25DV04K-IER6S3

Manufacturer: STMicroelectronics

Description: IC RFID TRANSP 13.56MHZ 8SO

Shipped from: Shenzhen/HK Warehouse

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The ST25DV04K-IER6S3, along with its counterparts ST25DV16K and ST25DV64K, is an NFC RFID tag that offers electrically erasable programmable memory (EEPROM) with capacities of 4, 16, and 64 Kbit respectively. These versatile devices feature both an I2C serial link for operation with a DC power supply and an RF link that enables contactless communication when powered by an electromagnetic wave. With various memory configurations and flexible protection features, the ST25DVxxx series provides a wide range of possibilities for data storage and exchange.

Overview of NFC RFID Tags

NFC (Near Field Communication) RFID tags are small electronic devices that communicate and exchange data using radio frequency technology. Access control, inventory management, and mobile payments are just a few of the applications that frequently make use of them to enable contactless interactions between devices. NFC RFID tags, like the ST25DV04K-IER6S3, allow for wireless data storage and transfer, making them an efficient and safe method of exchanging information.

Capacities and Interfaces of ST25DVxxx Devices

Numerous variations of the ST25DVxxx series are available, including the ST25DV04K-IER6S3, ST25DV16K, and ST25DV64K. These devices provide electrically erasable programmable memory (EEPROM) in a variety of capacities. The ST25DV04K offers 4 Kbit of capacity, while the ST25DV16K and ST25DV64K provide 16 Kbit and 64 Kbit of capacity, respectively. Depending on the particular needs of the application, this variable capacity enables the storage of various amounts of data.

Two interfaces are available on the ST25DVxxx devices. The first type of link allows communication when it is linked to a DC power source and is known as an I2C (Inter-Integrated Circuit) serial link. For microcontrollers and other devices that accept I2C communication protocols, this interface offers convenient connectivity.

When the device works as a contactless memory fueled by the received carrier electromagnetic wave, the second interface—a radio frequency link—activates. The ST25DVxxx devices operate in this mode in accordance with ISO/IEC 15693 and NFC Forum Type 5 standards, permitting communication with NFC-capable gadgets like smartphones and NFC scanners.



The ST25DVxxx devices offer versatility in data storage and communication due to their wide range of capacities and dual interfaces, making them appropriate for a variety of applications needing NFC RFID capability.

Understanding Memory Configurations

● I2C Mode

The ST25DVxxx devices, including the ST25DV04K-IER6S3, offer user memory in bytes while operating in I2C mode. Depending on the particular device model, the user memory capacity varies. The ST25DV04K, ST25DV16K, and ST25DV64K, for instance, each support up to 512 bytes, 2048 bytes, and 8192 bytes, respectively. This user memory can be partitioned into adaptable and secure sections, enabling effective data management and storage.

● RF Mode

User Memory in Blocks: The ST25DVxxx devices adhere to ISO/IEC 15693 and NFC Forum Type 5 standards when operating in RF mode. The user memory is divided up into 4 byte blocks. Depending on the particular device model, the user memory capacity in RF mode also varies. The ST25DV04K, ST25DV16K, and ST25DV64K, for example, can each carry up to 128 blocks, 512 blocks, and 2048 blocks, respectively. These blocks can be divided into flexible and secure sections, making them useful for storing data.

● Flexible and Protectable Areas

The user memory is made flexible and secure by the ST25DVxxx devices. The ability to divide the memory into many regions, each with its own access permissions and protective settings, is provided by these zones. Due to its adaptability, the memory can be divided into various zones to store various sorts of data or to impose access restrictions on particular regions. By granting selective read and write permissions, the protectable regions provide data security and integrity by shielding private information from unauthorized access or unintentional modification.

Developers may efficiently use the available user memory in both I2C and RF modes by understanding the memory configurations of the ST25DV04K-IER6S3 and other ST25DVxxx devices. They can also take use of the flexible and protectable areas to improve data organization and security.

Exploring Data Transfer and GPO Pin

● Fast Transfer Mode between RF and Contact Worlds

The ST25DV04K-IER6S3 and other ST25DVxxx devices provide a rapid transfer mode that enables seamless data exchange between the RF (contactless) and contact (I2C) worlds. The two interfaces can communicate and synchronize effectively in this manner. The fast transfer option improves the device’s overall performance and usability by providing seamless transitions and swift data transfer.

● The Role of the 256-Byte Volatile Buffer (Mailbox)

The ST25DVxxx devices have a 256-byte volatile buffer, often known as the mailbox, to help with efficient data transfer. Data is temporarily stored in the mailbox, allowing for quick communication between the RF and I2C interfaces. As a bridge, it enables the tool to quickly receive and transmit data between the two realms. The buffer’s volatile nature guarantees that it is cleared upon device reset or power loss, creating a blank slate for fresh data.

● GPO Pin and Incoming Event Notifications

A General-Purpose Output (GPO) pin found in ST25DVxxx devices is essential for delivering event notifications. The GPO pin has the capacity to signal a variety of incoming events, including the presence of a letter in the mailbox, the detection of an RF field, and ongoing RF activity. The system can be made aware of significant occurrences and respond appropriately by keeping an eye on the GPO pin’s condition. This function improves the device’s interaction and makes it possible for easy system integration.

Developers can use the ST25DV04K-IER6S3 and other ST25DVxxx devices for effective data transfer, synchronization, and event-driven operations by understanding the fast transfer mode, the volatile mailbox buffer, and the GPO pin capabilities. These capabilities allow programmers to enhance the responsiveness and performance of their systems and apps.


The ST25DV04K-IER6S3 and the ST25DVxxx series offer powerful features and benefits for NFC RFID applications. With electrically erasable programmable memory (EEPROM) capacities of 4, 16, and 64 Kbit, these tags support both I2C and RF interfaces, enabling flexible data storage and exchange. The devices provide user memory in bytes for I2C mode and in blocks for RF mode, with options for flexible and protectable memory areas. The fast transfer mode ensures efficient communication between the RF and contact worlds, while the volatile buffer (mailbox) facilitates rapid data exchange. The GPO pin provides event notifications, enhancing system interactivity. By leveraging these features, developers can unleash the potential of the ST25DV04K-IER6S3 and ST25DVxxx devices in diverse applications, such as smart card systems, IoT, asset tracking, and contactless payments.

Contact ICRFQ today to source the ST25DV04K-IER6S3 and other high-quality electronic components for your projects. Unleash the potential of the ST25DV04K-IER6S3 and ST25DVxxx series in your NFC RFID applications with the support of ICRFQ.

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