STMicroelectronics LRI64-A6S2U/2GE

Overview

LRI64-A6S2U/2GE from STMicroelectronics is a contactless 120-bit WORM memory tag IC operating at 13.56 MHz, compliant with ISO 15693 and ISO 18000-3 Mode 1 standards. It features a 64-bit factory-programmed UID, 7 × 8-bit user-writable WORM blocks, 26 Kbit/s bidirectional data rate, and internal tuning capacitors (21 pF / 28.5 pF / 97 pF) for antenna matching - deployed in RFID-based asset tagging and inventory tracking systems.

For engineers reviewing the LRI64-A6S2U/2GE datasheet, LRI64-A6S2U/2GE pinout, LRI64-A6S2U/2GE application, or LRI64-A6S2U/2GE equivalent, key selection criteria include ISO 15693 protocol compliance, 7 ms typical programming time, EAS capability via software control, and UFDFPN8 (2 × 3 mm²) RoHS-compliant packaging for embedded tag antenna integration.

Technical Context

The LRI64-A6S2U/2GE implements a reader-talks-first (RTF) communication protocol with strict timing constraints: t1 response delay ≤ 250 µs, t2 new request delay ≥ 200 µs, and t3 no-response delay ≥ 10 ms. It supports only high-data-rate mode (26 Kbit/s) using "1-out-of-4" pulse position coding for uplink and Manchester-coded load modulation with 423 kHz subcarrier for downlink.

Memory is organized into 15 × 8-bit blocks: blocks 0–7 store the 64-bit UID (with IC_ID = 02h in block 6 and E0h in block 7), block 8 holds AFI, block 9 holds DSFID, and blocks 10–14 constitute the 7-byte WORM user area - each block auto-locking after first valid write. Anticollision uses UID-based inventory with maskable slotting per ISO 15693.

Key Specifications

Pinout & Package

Package: UFDFPN8 (MLP8), 8-lead ultra-thin fine-pitch dual flat no-lead package, 2 × 3 mm² footprint, RoHS-compliant ECOPACK®.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RFID memory tag applications.

Compared with ST25DV04K and SL2S2001, the LRI64-A6S2U/2GE uniquely combines ISO 15693–native WORM locking, integrated tuning capacitors, and software EAS - making it optimal for cost-sensitive, high-volume passive tagging where data immutability and reader interoperability are primary requirements.

Availability

LRI64-A6S2U/2GE is available at Aetrix Electronics and suitable for asset tracking, library management, tool crib control, and medical equipment identification requiring stable component supply across extended product lifecycles.

Supply support for LRI64-A6S2U/2GE 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 smart power devices for industrial, automotive, and consumer markets.

The LRI64 belongs to ST's contactless memory tag IC product line, engineered specifically for ISO 15693–compliant passive RFID applications demanding low-cost, high-reliability, and long-term data integrity in unpowered environments.

FAQ

Is the LRI64-A6S2U/2GE still in active production?

No - the LRI64-A6S2U/2GE is marked as Obsolete by STMicroelectronics per its official documentation. However, Aetrix Electronics maintains legacy inventory with full traceability and offers lifecycle support including last-time-buy planning and cross-reference guidance for migration paths.

Can the 64-bit UID be rewritten after initial programming?

No - the UID is factory-programmed during wafer test and permanently locked. Blocks 0–7 contain the UID (including IC_ID = 02h and E0h), and no command exists to modify them; only blocks 10–14 are user-writable and lock after first write.

What antenna design guidelines apply to the AC0/AC1 terminals?

AC0 and AC1 require direct wire-bonding to a planar loop antenna tuned to 13.56 MHz. ST recommends using the internal 28.5 pF capacitor option with a 1.2–1.5 µH antenna inductance for optimal Q-factor and read range; impedance matching must be verified with network analyzer per Figure 39 in the datasheet.

Does the LRI64-A6S2U/2GE support multiple data rates or only 26 Kbit/s?

It supports only the high data rate mode (26 Kbit/s) as defined in ISO 15693 and ISO 18000-3 Mode 1. Lower data rates (e.g., 6.62 Kbit/s), alternative modulations (e.g., 100% ASK), or subcarrier variants are not implemented and will not function.