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STMicroelectronics ST25TB04K-AC6G6
- Part No.:
- ST25TB04K-AC6G6
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- Die
- Datasheet:
-
ST25TB04K-AC6G6.pdf
- Description:
- IC RFID TRANSP 13.56MHZ WAFER
- Quantity:
- Payment:
- Shipping:
Inventory:3,964
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Product details
Overview
ST25TB04K-AC6G6 from STMicroelectronics is a contactless 13.56 MHz RFID memory IC compliant with ISO 14443-2 Type B and ISO 14443-3 Type B standards, featuring 4096-bit EEPROM organized in 128 × 32-bit blocks, 64-bit unique identifier, dual 32-bit countdown counters with anti-tearing protection, and 106 kbit/s ASK/BPSK data transfer - deployed in secure access cards and reusable asset tags.
For engineers reviewing the ST25TB04K-AC6G6 datasheet, ST25TB04K-AC6G6 pinout, ST25TB04K-AC6G6 application, or ST25TB04K-AC6G6 equivalent, key selection criteria include ISO 14443-3B frame compliance, OTP lock register control (block 255), 1M write/erase endurance, 40-year data retention, and antenna interface design using AC0/AC1 pads for 13.56 MHz coupling.
Technical Context
The ST25TB04K-AC6G6 implements a probabilistic anticollision protocol using Slot_marker, Initiate, and Pcall16 commands to resolve multiple tags in reader field; its state machine transitions between Power-off, Ready, Inventory, Selected, Deselected, and Deactivated states based on command sequence and field presence.
It uses 10% amplitude-shift keying (ASK) for downlink (reader → tag) at 13.56 MHz and 847 kHz BPSK subcarrier modulation for uplink (tag → reader); all frames include 16-bit CRC (initial value FFFFh, LSB-first transmission) validated before command execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Interface | ISO 14443-2 Type B compliant; enables interoperability with standard NFC-B readers and infrastructure. |
| Carrier Frequency | 13.56 MHz; defines operating band for near-field inductive coupling and regulatory alignment (e.g., ETSI EN 300 330). |
| Data Rate | 106 kbit/s full-duplex; supports high-throughput tag interrogation in multi-tag environments without frame timeout issues. |
| Memory Capacity | 4096-bit EEPROM (128 × 32-bit blocks); provides sufficient storage for cryptographic keys, configuration data, and usage logs in secure tokens. |
| Endurance & Retention | 1 million erase/write cycles / 40-year data retention; ensures long-term reliability in industrial reusables and transit fare media. |
| Anticollision | 8-bit Chip_ID + probabilistic slotting (Initiate/Pcall16/Slot_marker); allows deterministic identification of ≥100 tags within single reader field. |
| Power Source | Passive RF-powered (no battery); derives VDD from induced antenna voltage; eliminates maintenance and size constraints of powered tags. |
Pinout & Package
ST25TB04K-AC6G6 is delivered as a bare die (unsawn wafer or bumped/sawn wafer) with no leaded package; bonding pads AC0 and AC1 connect directly to external antenna coil traces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC0 | Antenna Coil Terminal 0 | Primary RF input node; must be bonded to one end of printed loop antenna; forms resonant LC tank with internal 68 pF tuning capacitor. |
| AC1 | Antenna Coil Terminal 1 | Secondary RF input node; completes antenna connection; differential coupling enables robust power harvesting and signal demodulation. |
Key Features
| Feature | Design Value |
|---|---|
| 64-bit Unique Identifier (UID) | Factory-programmed ROM UID (blocks 255–256) enables unclonable device authentication and secure provisioning in PKI-based systems. |
| OTP Lock Register (block 255) | 8-bit write-once lock controls per-block (7–15) EEPROM write protection; prevents tampering of critical firmware or credential data after deployment. |
| Auto-erase Write_block | EEPROM write includes built-in erase cycle; eliminates need for separate erase command and guarantees block consistency during power loss. |
| Dual 32-bit Countdown Counters | Counters at blocks 5 and 6 support irreversible usage tracking (e.g., ticket validity, consumable dosing); anti-tearing logic preserves count on interruption. |
| Resettable OTP Area (blocks 0–4) | Five 32-bit Boolean words support flexible one-time programming with reload capability (up to 2047 times via counter 6 trigger); ideal for dynamic key revocation. |
Applications
| Secure Access Card | Reusable Asset Tag |
|---|---|
|
Use Scenario: Contactless employee badge used for physical door entry and logical network login. IC Role / Device Role / Timing Role: Secure non-volatile memory storing encrypted credentials, access privileges, and audit logs; operates in ISO 14443-B mode with reader-initiated anticollision. Use Value: 4096-bit EEPROM accommodates multiple credential sets; OTP lock register prevents unauthorized overwrite of access rules; UID enables backend identity binding. |
Use Scenario: Industrial tool tracking tag embedded in metal-handled equipment for lifecycle management. IC Role / Device Role / Timing Role: Passive RFID tag powered by handheld reader; stores calibration history, maintenance records, and usage counters. Use Value: Dual countdown counters track remaining service life; 40-year data retention ensures integrity across equipment lifespan; 1M write cycles support frequent updates. |
| Transit Fare Token | Medical Consumable ID |
|
Use Scenario: Rechargeable contactless smart card for metro and bus fare collection. IC Role / Device Role / Timing Role: ISO 14443-B compliant memory IC storing balance, transaction log, and trip history; selected via Chip_ID during tap-in/tap-out. Use Value: Anticollision handles peak-hour multi-tag congestion; self-timed 5 ms programming enables fast balance update; UID prevents cloning fraud. |
Use Scenario: Sterilizable tag attached to IV pump cartridges to verify drug type, batch, and expiration. IC Role / Device Role / Timing Role: Tamper-resistant memory storing cryptographically signed drug metadata; write-protected blocks prevent dosage override. Use Value: OTP_Lock_Reg permanently locks critical parameters post-sterilization; 68 pF internal tuning capacitor simplifies antenna matching in compact medical packaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar contactless memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST25DV04K-IER | I²C interface + RF interface; 4-Kbit EEPROM; integrated RF field detector; no anticollision engine. | Requires host MCU for protocol handling; suited for hybrid wired/wireless systems where local control is needed. | Select when system needs both I²C and RF access, not pure contactless-only operation. |
| NXP NT3H2111W0FHKH | ISO 14443-A compliant; 2-Kbit EEPROM; integrated NDEF formatting; no countdown counters or resettable OTP. | Optimized for NFC Forum Type 4 tag use cases (e.g., smartphone interaction); lacks ST25TB04K's BPSK uplink and probabilistic anticollision. | Select for smartphone-read NFC applications requiring NDEF compatibility over multi-tag inventory performance. |
Compared with ST25TB04K-AC6G6, ST25DV04K-IER adds local I²C control but removes autonomous anticollision, while NT3H2111W0FHKH prioritizes NFC-A/NDEF interoperability over high-density multi-tag throughput and counter-based usage tracking.
Availability
ST25TB04K-AC6G6 is available at Aetrix Electronics and suitable for secure access cards, reusable asset tags, transit fare tokens, and medical consumable IDs requiring stable component supply, long-term data integrity, and ISO 14443-B interoperability.
Supply support for ST25TB04K-AC6G6 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, analog ICs, MEMS, and secure RFID solutions for industrial, automotive, and consumer markets.
The ST25 product line delivers contactless NFC/RFID memory and dynamic tag ICs engineered for secure, battery-free identification, authentication, and data logging in demanding physical environments.
FAQ
What antenna design considerations apply to ST25TB04K-AC6G6?
The ST25TB04K-AC6G6 integrates a 68 pF internal tuning capacitor and requires direct bond-wire connection of AC0 and AC1 to a printed loop antenna. Optimal performance demands antenna impedance matching to ~15–20 Ω at 13.56 MHz, with Q-factor >25 to ensure sufficient power harvesting and reliable read range beyond 5 cm.
How does the anti-tearing protection work for the countdown counters?
Anti-tearing logic monitors power stability during counter write operations. If field strength drops below operational threshold mid-write, the ST25TB04K aborts the update and retains the pre-existing counter value - preventing partial writes that could corrupt usage counts in applications like medical dosing or ticket validation.
Can the OTP_Lock_Reg be modified after initial programming?
No. Once any bit in OTP_Lock_Reg (block 255, bits b31–b24) is set to 0 to protect EEPROM blocks 7–15, it cannot be reset to 1. The register operates as a true one-time programmable lock; protection is permanent and irreversible, enforcing hardware-level write security.
What is the role of the 847 kHz subcarrier in uplink communication?
The 847 kHz BPSK subcarrier modulates the antenna load to encode uplink data, improving signal-to-noise ratio and enabling robust detection by the reader's analog front-end. This subcarrier is mandated by ISO 14443-2 Type B and allows reliable backscatter communication even under weak or noisy RF field conditions.
ST25TB04K-AC6G6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ST25T
- Package/Case:
- Die
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- RFID Transponder
- Frequency:
- 13.56MHz
- Standards:
- ISO 14443
- Interface:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
ST25TB04K-AC6G6 FAQ
1.How can I place an order for ST25TB04K-AC6G6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25TB04K-AC6G6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ST25TB04K-AC6G6 reliable?
The price and inventory of ST25TB04K-AC6G6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25TB04K-AC6G6 is usually 5 days.
3.What payment methods are accepted for ST25TB04K-AC6G6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25TB04K-AC6G6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25TB04K-AC6G6?
ST25TB04K-AC6G6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25TB04K-AC6G6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ST25TB04K-AC6G6?
For technical support, including ST25TB04K-AC6G6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25TB04K-AC6G6 requirements.
6.How does Aetrix verify that ST25TB04K-AC6G6 is sourced from the original manufacturer or authorized distributors?
All ST25TB04K-AC6G6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST25TB04K-AC6G6 meets industry standards.
7.What is the process for return or replacement of ST25TB04K-AC6G6?
All ST25TB04K-AC6G6 units undergo pre-shipment inspection (PSI). If there is an issue with ST25TB04K-AC6G6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ST25TB04K-AC6G6 part is unused and in its original packaging.
Return procedure for ST25TB04K-AC6G6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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