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STMicroelectronics SRI512-W4/1GE
- Part No.:
- SRI512-W4/1GE
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- Die
- Datasheet:
-
SRI512-W4/1GE.pdf
- Description:
- IC RFID TRANSP 13.56MHZ DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,103
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Product details
Overview
SRI512-W4/1GE from STMicroelectronics is a 13.56 MHz ISO 14443-3 Type B contactless memory IC with 512-bit EEPROM, 64-bit UID, and hardware-based anticollision for multi-tag environments. It operates without an external power supply, draws energy from the reader's RF field, supports 106 Kbit/s data transfer, and integrates internal tuning capacitance for antenna matching in smart card and tag applications.
For engineers reviewing the SRI512-W4/1GE datasheet, SRI512-W4/1GE pinout, SRI512-W4/1GE application, or SRI512-W4/1GE equivalent, key selection criteria include ISO 14443-2/3 Type B compliance, 8-bit Chip_ID anticollision, self-timed 5 ms write cycle, 1 million erase/write endurance, and 40-year EEPROM data retention under ambient conditions.
Technical Context
The SRI512-W4/1GE implements a passive RFID transponder architecture compliant with ISO 14443-2 Type B physical layer and ISO 14443-3 Type B framing. It uses 10% ASK modulation for downlink (reader-to-tag) and 847 kHz BPSK subcarrier load modulation for uplink (tag-to-reader), with fixed 106 Kbit/s bidirectional data rate.
Its memory architecture comprises three distinct regions: a resettable 5-byte OTP area, two independent 32-bit binary counters with automated antitearing protection, and a 16-block (32-bit/block) EEPROM array supporting Read_block and Write_block commands. All operations are initiated via nine defined ISO-compliant commands including Initiate, Select, and Get_UID.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Carrier frequency | 13.56 MHz - Enables interoperability with standard HF RFID readers and compliance with global ISM band regulations. |
| Data rate | 106 Kbit/s - Fixed bidirectional rate defining timing constraints for frame exchange and real-time system response. |
| Memory capacity | 512-bit EEPROM (16 × 32-bit blocks) - Supports block-level read/write with auto-erase, suitable for secure ID storage and counter-based usage tracking. |
| Anticollision | 8-bit Chip_ID based - Enables deterministic selection of individual tags within overlapping RF fields using standardized slotting protocol. |
| Endurance & retention | 1 million erase/write cycles / 40-year data retention - Guarantees long-term reliability in reusable ticketing, access control, and asset tagging deployments. |
| Power source | RF-coupled only - Eliminates need for onboard battery or wiring; powered entirely by reader's magnetic field via AC1/AC0 antenna terminals. |
| Unique identifier | 64-bit UID - Factory-programmed immutable serial number enabling globally unique device identification and cryptographic binding. |
Pinout & Package
The SRI512-W4/1GE is supplied as a bare die (unsawn wafer or bumped and sawn wafer) with two bond pads for direct antenna connection. No leadframe, molding compound, or standard surface-mount package is used; it is designed for embedding into inlay substrates or laminated smart cards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | Antenna coil terminal | Primary RF input node; connects directly to one end of printed loop antenna for energy harvesting and signal coupling. |
| AC0 | Antenna coil terminal | Secondary RF input node; completes resonant LC tank circuit with AC1 and internal tuning capacitor (no external components required). |
Key Features
| Feature | Design Value |
|---|---|
| ISO 14443-2/3 Type B compliance | Ensures plug-and-play interoperability with commercial HF readers and infrastructure without custom driver development. |
| Self-timed programming cycle | Eliminates need for external timing control; internal logic manages full 5 ms write sequence including erase, verify, and lock. |
| Automated antitearing protection | Hardware-enforced atomic decrement of binary counters prevents partial updates during power loss or RF dropout. |
| Internal tuning capacitor | Integrated 23 pF capacitor enables resonance at 13.56 MHz with typical 1–2 µH antenna inductance, reducing bill-of-materials. |
| Write protect capability | EEPROM blocks can be permanently locked via OTP configuration, preventing unauthorized modification of critical data fields. |
Applications
| Transport Ticketing | Access Control |
|---|---|
|
Use Scenario: Reusable transit pass embedded in PVC card or paper ticket, scanned at gate readers. IC Role / Device Role / Timing Role: Passive contactless memory storing trip balance, validation timestamp, and usage counter. Use Value: 2×32-bit binary counters track remaining rides with hardware antitearing, ensuring accurate balance even during mid-transaction power loss. |
Use Scenario: Employee badge authenticated at door readers in corporate or government facilities. IC Role / Device Role / Timing Role: Secure identity token providing immutable 64-bit UID and encrypted credential storage. Use Value: Factory-programmed UID prevents cloning; OTP-lockable EEPROM secures access policy flags against tampering. |
| Asset Tracking | Loyalty Card |
|
Use Scenario: Tool or equipment tag scanned during check-in/check-out in industrial maintenance workflows. IC Role / Device Role / Timing Role: Durable memory element recording service history, calibration dates, and operator ID. Use Value: 40-year data retention ensures traceability over full equipment lifecycle; 1 million write cycles support daily logging. |
Use Scenario: Consumer loyalty card tapped at POS terminals to redeem points or apply discounts. IC Role / Device Role / Timing Role: Transactional memory storing point balance, tier status, and redemption tokens. Use Value: Block-write capability enables fast 32-bit point updates; anticollision allows simultaneous scanning of multiple cards in queue. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar contactless memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SRF55V10S | ISO 14443-3 Type A compliant; 1 kbit EEPROM; no binary counters; requires external tuning capacitor. | Limited to Type A reader ecosystems; lacks hardware antitearing and counter functionality. | Select when integrating with legacy Type A infrastructure and lower memory density suffices. |
| M24LR64-R | I²C + RFID dual-interface; 64 kbit EEPROM; integrated EEPROM write protection; no built-in anticollision logic. | Requires active microcontroller host; supports battery-assisted mode; not purely passive. | Choose when hybrid wired/wireless communication is needed and system-level collision management is feasible. |
Compared with SRF55V10S and M24LR64-R, the SRI512-W4/1GE delivers dedicated ISO 14443-3 Type B passive operation with on-chip anticollision, binary counters, and zero-external-component tuning-making it optimal for cost-sensitive, high-volume, purely contactless deployments.
Availability
SRI512-W4/1GE is available at Aetrix Electronics and suitable for transport ticketing, physical access control, industrial asset tagging, and consumer loyalty programs requiring stable component supply across multi-year production cycles.
Supply support for SRI512-W4/1GE 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, specializing in microcontrollers, power management, sensors, and secure MCU solutions for automotive, industrial, and consumer markets.
The SRI512-W4/1GE belongs to ST's contactless memory IC product line, engineered specifically for ISO-compliant passive RFID tags where ultra-low power, high reliability, and minimal external components are critical design requirements.
FAQ
Does SRI512-W4/1GE require an external power supply?
No. The SRI512-W4/1GE is a fully passive device powered solely by the 13.56 MHz RF field from the reader via its AC1 and AC0 antenna terminals. It contains an integrated voltage regulator and does not support battery or wired power connections.
What is the function of the two binary counters in SRI512-W4/1GE?
The SRI512-W4/1GE includes two independent 32-bit binary counters (addresses 5–6) that decrement from 0xFFFFFFFF to 0x00000000. They feature hardware antitearing protection to ensure atomic updates during RF interruptions, making them ideal for ride passes or consumable tracking.
Can the 512-bit EEPROM be written byte-by-byte?
No. The EEPROM is organized in 16 blocks of 32 bits each and supports only block-level operations via Read_block and Write_block commands. Each Write_block triggers an internal auto-erase cycle, and partial-block writes are not supported.
Is the 64-bit UID user-programmable?
No. The 64-bit Unique Identifier is factory-programmed during wafer test and is read-only. It cannot be altered, erased, or reprogrammed, ensuring permanent, unclonable device identity for security-critical applications.
SRI512-W4/1GE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Box
- Product Status:
- Obsolete
- Type:
- RFID Transponder
- Frequency:
- 13.56MHz
- Standards:
- ISO 14443, ISO 15693
- Interface:
- -
- Voltage - Supply:
- 2.5V ~ 3.5V
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
SRI512-W4/1GE FAQ
1.How can I place an order for SRI512-W4/1GE through Aetrix?
Please submit a Request for Quotation (RFQ) for SRI512-W4/1GE 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 SRI512-W4/1GE reliable?
The price and inventory of SRI512-W4/1GE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRI512-W4/1GE is usually 5 days.
3.What payment methods are accepted for SRI512-W4/1GE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRI512-W4/1GE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRI512-W4/1GE?
SRI512-W4/1GE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRI512-W4/1GE 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 SRI512-W4/1GE?
For technical support, including SRI512-W4/1GE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRI512-W4/1GE requirements.
6.How does Aetrix verify that SRI512-W4/1GE is sourced from the original manufacturer or authorized distributors?
All SRI512-W4/1GE 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 SRI512-W4/1GE meets industry standards.
7.What is the process for return or replacement of SRI512-W4/1GE?
All SRI512-W4/1GE units undergo pre-shipment inspection (PSI). If there is an issue with SRI512-W4/1GE, 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 SRI512-W4/1GE part is unused and in its original packaging.
Return procedure for SRI512-W4/1GE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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