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STMicroelectronics ST25TB512-AT6F6
- Part No.:
- ST25TB512-AT6F6
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- Die
- Datasheet:
-
ST25TB512-AT6F6.pdf
- Description:
- 13.56 MHZ SHORT-RANGE CONTACTLES
- Quantity:
- Payment:
- Shipping:
Inventory:3,024
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Product details
Overview
ST25TB512-AT6F6 from STMicroelectronics is a contactless 512-bit EEPROM IC compliant with ISO 14443-2 Type B and ISO 14443-3 Type B standards, operating at 13.56 MHz carrier frequency with 847 kHz BPSK subcarrier modulation, supporting 106 kbit/s bidirectional data transfer, featuring 64-bit UID, dual 32-bit decrement-only counters with anti-tearing protection, and on-die 68 pF tuning capacitor - deployed in reusable transport ticketing and secure access tokens.
For engineers reviewing the ST25TB512-AT6F6 datasheet, ST25TB512-AT6F6 pinout, ST25TB512-AT6F6 application, or ST25TB512-AT6F6 equivalent, key selection considerations include ISO 14443-3B frame compliance, 1-million-cycle EEPROM endurance, OTP-based block write protection (blocks 0–15), deterministic anticollision via 8-bit Chip_ID and Slot_marker protocol, and self-timed 5 ms programming cycle without external timing control.
Technical Context
The ST25TB512-AT6F6 implements a probabilistic anticollision scheme using Initiate(), Pcall16(), and Slot_marker() commands to resolve up to 256 tags in a reader field, with each tag assigned an 8-bit Chip_ID for deterministic selection. Its internal ASK demodulator accepts 10% amplitude-modulated 13.56 MHz carrier, while BPSK load modulation at 847 kHz enables robust backscatter communication.
Memory is partitioned into three functional zones: 128 × 32-bit user EEPROM blocks (organized as 16 addressable blocks of 32 bits), two dedicated 32-bit binary countdown counters (blocks 5 and 6), and a system area containing OTP_Lock_Reg (block 255) controlling per-block write protection - all accessed via nine standardized commands including Read_block, Write_block, and Get_UID.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface Standard | ISO 14443-2 Type B RF interface and ISO 14443-3 Type B frame format - ensures interoperability with standard NFC-B readers and infrastructure. |
| Carrier Frequency | 13.56 MHz - enables operation within globally licensed ISM band for short-range contactless systems. |
| Data Rate | 106 kbit/s full-duplex - supports rapid block reads/writes (32-bit) and UID retrieval within strict timing windows. |
| Memory Capacity | 512-bit EEPROM (16 × 32-bit blocks) + two 32-bit decrement-only counters - provides configurable storage for credentials, usage logs, and tamper-resistant state tracking. |
| Endurance & Retention | 1 million erase/write cycles and 40-year data retention - validated for high-cycle applications like transit passes and industrial asset tags. |
| Anticollision | 8-bit Chip_ID + probabilistic slot-based resolution (Pcall16/Slot_marker) - enables reliable multi-tag identification in dense environments without host-side arbitration logic. |
| Power Source | Passive RF coupling only - no battery or external power required; energy harvested from reader's 13.56 MHz field powers regulator and logic. |
Pinout & Package
ST25TB512-AT6F6 is a bare die product intended for wafer-level integration or bump-and-sawn assembly; it has no conventional leaded package. It features two antenna terminals - AC0 and AC1 - designed for direct wire bonding to an external planar antenna structure. Internal tuning capacitance is fixed at 68 pF, eliminating need for external matching components in most 13.56 MHz antenna designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC0 | Antenna Coil Terminal 0 | Primary RF input node; must be bonded directly to one end of printed antenna loop to enable energy harvesting and ASK demodulation. |
| AC1 | Antenna Coil Terminal 1 | Secondary RF input node; completes resonant LC tank with AC0 and integrated 68 pF capacitor - defines operational frequency and coupling efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| On-die 68 pF tuning capacitor | Eliminates need for external capacitors in antenna matching network - reduces bill-of-materials and layout complexity for compact tag designs. |
| Automated anti-tearing protection | Hardware-enforced atomic counter update - guarantees counter integrity during unexpected power loss during Write_block execution. |
| OTP-based block write protection | 16-bit OTP_Lock_Reg (block 255) enables irreversible per-block lock of EEPROM addresses 0–15 - prevents unauthorized modification of critical configuration or credential data. |
| Self-timed 5 ms programming cycle | No external clock or timing control required - simplifies firmware integration and ensures consistent write latency across varying field strengths. |
| 64-bit Unique Identifier (UID) | Factory-programmed immutable ROM UID - serves as cryptographic root for authentication protocols and eliminates need for host-side ID management. |
Applications
| Transport Ticketing | Secure Access Tokens |
|---|---|
|
Use Scenario: Reusable contactless transit cards used across metro, bus, and ferry systems requiring multi-year durability and tamper resistance. IC Role / Device Role / Timing Role: Contactless memory storing encrypted balance, trip history, and validity period; responds to reader-initiated anticollision and block read/write commands. Use Value: Dual 32-bit counters track remaining rides or validity days with guaranteed monotonic decrement and anti-tearing - preventing rollback attacks during power interruption. |
Use Scenario: Physical security badges for enterprise facilities where credential revocation, audit logging, and session binding are required. IC Role / Device Role / Timing Role: ISO 14443-B-compliant secure element providing immutable UID and write-protected credential blocks accessible only after successful reader authentication. Use Value: OTP_Lock_Reg allows permanent locking of credential blocks (e.g., blocks 0–4) post-personalization - ensuring credential integrity against physical cloning or reprogramming. |
| Industrial Asset Tagging | Reusable Logistics Labels |
|
Use Scenario: High-cycle maintenance tags attached to factory equipment, tracking service intervals, calibration dates, and firmware versions across decades. IC Role / Device Role / Timing Role: Passive RFID memory storing time-stamped service records and revision-controlled configuration data; accessed via handheld ISO 14443-B readers. Use Value: 40-year data retention and 1-million-cycle endurance ensure reliable operation over equipment lifetime - eliminating need for periodic tag replacement. |
Use Scenario: Returnable shipping containers and pallets tracked across global supply chains, requiring durable, low-cost, field-programmable identifiers. IC Role / Device Role / Timing Role: Contactless EEPROM storing container ID, origin/destination codes, and cargo manifest checksums - updated at warehouse checkpoints using fixed-mount readers. Use Value: 106 kbit/s data rate enables full 512-bit block writes in <100 µs - minimizing dwell time at automated gate readers and supporting high-throughput logistics operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar contactless memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST25TV512-AP | Same 512-bit EEPROM and ISO 14443-B compliance, but includes voltage supervisor and enhanced ESD protection (8 kV HBM); uses 48 pF internal capacitor. | Targeted at harsh industrial environments with higher ESD risk and unstable field coupling; requires antenna retuning due to lower CTUN. | Select when operating near motors, welders, or in unshielded metal enclosures where robustness outweighs tuning simplicity. |
| NXP NT3H2111W0FHKH | 1-kbyte EEPROM, NFC Forum Type 2 Tag compliant (not ISO 14443-B), supports NDEF formatting and dynamic lock bits; no built-in counters. | Optimized for smartphone-read NFC applications (e.g., smart posters, consumer device pairing); lacks deterministic anticollision for multi-tag reader fields. | Select for consumer-facing NFC use cases requiring smartphone compatibility and NDEF message support - not for multi-tag transport or industrial readers. |
Compared with ST25TV5111-AP and NT3H2111W0FHKH, the ST25TB512-AT6F6 uniquely balances ISO 14443-B interoperability, hardware anti-tearing counters, and minimal external component count - making it optimal for cost-sensitive, high-volume transport and industrial tagging where deterministic multi-tag resolution is mandatory.
Availability
ST25TB512-AT6F6 is available at Aetrix Electronics and suitable for transport ticketing, secure access tokens, industrial asset tagging, and reusable logistics labels requiring stable component supply across long-lifecycle deployments.
Supply support for ST25TB512-AT6F6 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 MCU solutions for industrial, automotive, and smart infrastructure markets.
The ST25 series targets contactless memory and NFC applications, with the ST25TB line specifically engineered for ISO 14443-B-compliant, high-reliability, passive RFID tagging in transportation, access control, and industrial traceability systems.
FAQ
Does ST25TB512-AT6F6 require an external capacitor for antenna tuning?
No. The ST25TB512-AT6F6 integrates a fixed 68 pF internal tuning capacitor between AC0 and AC1 terminals, enabling direct connection to a printed antenna without external matching components. This simplifies PCB layout and reduces BOM cost for mass-produced tags.
How is write protection enforced on the EEPROM blocks?
Write protection is controlled by the 16-bit OTP_Lock_Reg located at block address 255. Each bit corresponds to one of the 16 EEPROM blocks (0–15); setting a bit to '0' permanently locks that block. Once locked, the block behaves as ROM and cannot be unlocked or rewritten - verified by hardware during every Write_block command.
What happens if power is lost during a counter decrement operation?
The ST25TB512-AT6F6 implements hardware-level anti-tearing logic for both counters (blocks 5 and 6). If power drops mid-write, the counter value remains unchanged - no partial or corrupted decrement occurs. The next valid Write_block command resumes from the original value, ensuring monotonicity and data integrity.
Can ST25TB512-AT6F6 operate with ISO 14443-A readers?
No. The ST25TB512-AT6F6 is strictly compliant with ISO 14443-2 Type B and ISO 14443-3 Type B standards. It does not support ISO 14443-A modulation (100% ASK), framing, or anticollision protocols. Interoperability requires a Type B reader capable of 10% ASK modulation and BPSK subcarrier detection at 847 kHz.
ST25TB512-AT6F6 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
ST25TB512-AT6F6 FAQ
1.How can I place an order for ST25TB512-AT6F6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25TB512-AT6F6 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 ST25TB512-AT6F6 reliable?
The price and inventory of ST25TB512-AT6F6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25TB512-AT6F6 is usually 5 days.
3.What payment methods are accepted for ST25TB512-AT6F6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25TB512-AT6F6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25TB512-AT6F6?
ST25TB512-AT6F6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25TB512-AT6F6 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 ST25TB512-AT6F6?
For technical support, including ST25TB512-AT6F6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25TB512-AT6F6 requirements.
6.How does Aetrix verify that ST25TB512-AT6F6 is sourced from the original manufacturer or authorized distributors?
All ST25TB512-AT6F6 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 ST25TB512-AT6F6 meets industry standards.
7.What is the process for return or replacement of ST25TB512-AT6F6?
All ST25TB512-AT6F6 units undergo pre-shipment inspection (PSI). If there is an issue with ST25TB512-AT6F6, 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 ST25TB512-AT6F6 part is unused and in its original packaging.
Return procedure for ST25TB512-AT6F6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST25TB512-AT6F6 Tags
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SL2S2602FTBX
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ST25DV04K-IER6S3
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ST25DV04K-IER6C3
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M24LR04E-RMC6T/2
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ST25DV64KC-IE6S3
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