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Microchip Technology 24AA02UID-I/SN
- Part No.:
- 24AA02UID-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24AA02UID-I/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
24AA02UID-I/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with a factory-programmed, globally unique 32-bit serial number stored at addresses 0xFC–0xFF and permanently write-protected. It operates from 1.7V to 5.5V, draws ≤1 µA standby current and ≤1 mA active read current, and supports 100 kHz (VCC < 2.5V) or 400 kHz (VCC ≥ 2.5V) clock rates. It is used for secure device identification in industrial IoT nodes, embedded authentication modules, and firmware anti-cloning systems.
For engineers reviewing the 24AA02UID-I/SN datasheet, 24AA02UID-I/SN pinout, 24AA02UID-I/SN application, or 24AA02UID-I/SN equivalent, key selection criteria include its preprogrammed UID integrity, I²C timing compliance at low voltage, 8-byte page write buffer, 1M-cycle endurance, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The 24AA02UID-I/SN implements a standard two-wire I²C slave interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer auto-increments during sequential reads, enabling full 256-byte memory access without repeated address commands.
Unlike the 24AA025UID, the 24AA02UID-I/SN omits A0/A1/A2 address pins-making it a fixed-slave-address device (0xA0/0xA1 for write/read) with no bus-cascading capability. Its memory is split into two 128×8-bit blocks, with upper half (0x80–0xFF) write-protected to preserve UID and manufacturer codes (0xFA = 0x29, 0xFB = 0x41).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), organized as two 128-byte blocks |
| Unique ID | Factory-programmed 32-bit serial number at 0xFC–0xFF; globally unique across all Microchip UID-family devices |
| VCC range | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| I²C speed | Up to 400 kHz (≥2.5V); 100 kHz only below 2.5V - ensures timing compliance across wide supply range |
| Page write size | 8-byte buffer - allows efficient burst writes within single physical page (0x00–0x07, 0x08–0x0F, etc.) |
| Endurance & retention | 1 million erase/write cycles; >200 years data retention - suitable for infrequent but mission-critical identity storage |
| ESD protection | >4 kV HBM - robust enough for handling in industrial assembly environments |
Pinout & Package
24AA02UID-I/SN is supplied in a RoHS-compliant 5-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and Pb-free matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCL) | Serial Clock input | Synchronizes all I²C transactions; requires external pull-up; Schmitt-triggered for noise immunity |
| 2 (VSS) | Ground reference | Return path for all internal logic and I/O; must be low-impedance to support 1 µA standby current spec |
| 3 (SDA) | Serial Data bidirectional I/O | Open-drain output requiring external pull-up (2 kΩ for 400 kHz); transmits ACK/NACK and data |
| 4 (VCC) | Power supply | Accepts 1.7–5.5V; internal VCC threshold detector disables writes below ~1.5V to prevent corruption |
| 5 (NC) | No-connect terminal | Internally unconnected; must be left floating - not tied to VCC, VSS, or other signals |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed 32-bit UID | Immutable, globally unique identifier stored in write-protected memory (0xFC–0xFF), eliminating need for field programming or cryptographic key provisioning |
| Low-voltage operation | Functional down to 1.7V with guaranteed 400 kHz I²C timing above 2.5V - supports battery-powered and energy-harvesting edge devices |
| Self-timed write cycle | Internal erase/write completes in ≤5 ms; ACK polling enables precise host synchronization without fixed delays |
| Noise-immune I/O | Schmitt-trigger inputs + 50 ns input filter + controlled output slew rate - prevents false Start/Stop detection on noisy industrial buses |
| Write protection | Hardware-enforced lock on upper 128 bytes (0x80–0xFF) - guarantees UID and device codes remain intact across power cycles and firmware updates |
Applications
| Secure Device Authentication | Industrial Asset Tagging |
|---|---|
Use Scenario: Embedded system verifies hardware authenticity before loading encrypted firmware or enabling licensed features. IC Role / Device Role / Timing Role: Provides immutable, factory-assigned identity token accessed via I²C during boot sequence. Use Value: Prevents cloning and unauthorized firmware execution by binding software license to physically unique hardware ID. | Use Scenario: Factory-applied RFID or barcode tags are supplemented with tamper-resistant electronic IDs on PLC modules or motor drives. IC Role / Device Role / Timing Role: Stores permanent asset ID, calibration date, and revision code readable over I²C during commissioning or maintenance. Use Value: Enables automated inventory tracking and lifecycle management without relying on external databases or manual entry. |
| Firmware Anti-Tampering | Edge Node Identity Binding |
Use Scenario: MCU calculates hash of critical firmware sections and compares against value stored in EEPROM after each update. IC Role / Device Role / Timing Role: Holds cryptographic checksum bound to device-specific UID, ensuring firmware integrity and origin authenticity. Use Value: Detects unauthorized modifications or malicious injection by validating both content and source identity in one atomic check. | Use Scenario: Wireless sensor node registers with cloud platform using hardware-derived identity instead of software-generated UUID. IC Role / Device Role / Timing Role: Supplies cryptographically stable 32-bit seed for deterministic key derivation in TLS handshake or LoRaWAN join process. Use Value: Eliminates entropy dependency and random number generator weaknesses by anchoring identity to silicon-level uniqueness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM with factory-programmed UID applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA02E48-I/SN | Same 2 Kbit capacity and 32-bit UID, but stores UID at 0xFA–0xFF (48-bit extended map); includes additional manufacturer/device codes at 0xFA/0xFB | Supports 48-bit extended serial number read (0xFA–0xFF) out-of-box; identical SOT-23-5 pinout and I²C protocol | Select when application requires larger factory-provided serial number without software padding or when leveraging extended memory map for traceability fields |
| AT24MAC402-MAHM-T | 2 Kbit EEPROM with 48-bit factory UID; supports I²C up to 1 MHz; built-in MAC address block (0x00–0x05); different memory map and write protection scheme | Includes IEEE 802.3-compliant MAC address block; uses different UID location (0xF8–0xFF) and lacks dedicated manufacturer code byte | Select when Ethernet/Wi-Fi MAC binding is required alongside UID, or when higher I²C speed (1 MHz) is needed for high-throughput provisioning |
Compared with 24AA02UID-I/SN, the 24AA02E48-I/SN offers native 48-bit UID access while maintaining identical footprint and timing, whereas AT24MAC402-MAHM-T trades UID-only focus for integrated MAC functionality and faster I²C-but requires redesign of UID read logic and memory layout assumptions.
Availability
24AA02UID-I/SN is available at Aetrix Electronics and suitable for industrial IoT node deployment, secure bootloader validation, and embedded device authentication requiring stable component supply across multi-year production cycles.
Supply support for 24AA02UID-I/SN 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
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24AA02UID product line delivers factory-programmed, tamper-resistant identity storage for secure boot, device authentication, and anti-counterfeiting in industrial, automotive, and consumer applications.
FAQ
What is the exact memory organization and UID location for the 24AA02UID-I/SN?
The 24AA02UID-I/SN contains 256 bytes (2 Kbit) of EEPROM organized as two 128-byte blocks. Its factory-programmed 32-bit serial number is stored in the last four bytes: addresses 0xFC, 0xFD, 0xFE, and 0xFF. These locations reside in the upper half of memory (0x80–0xFF), which is permanently write-protected. Manufacturer code (0x29) is at 0xFA and device identifier (0x41) at 0xFB.
Does the 24AA02UID-I/SN support multiple devices on the same I²C bus?
No, the 24AA02UID-I/SN does not support multi-device addressing. Unlike the 24AA025UID, it lacks A0/A1/A2 address pins - its I²C slave address is fixed at 0xA0 (write) / 0xA1 (read). Only one 24AA02UID-I/SN can operate per I²C segment unless isolated via multiplexer or separate buses.
How is write protection implemented on the 24AA02UID-I/SN?
Write protection on the 24AA02UID-I/SN is hardwired: the upper 128 bytes (addresses 0x80–0xFF) are permanently locked against write operations. This protects the 32-bit UID (0xFC–0xFF), manufacturer code (0xFA), and device ID (0xFB). The lower 128 bytes (0x00–0x7F) remain fully writable and readable for user data storage.
What are the I²C timing requirements for 24AA02UID-I/SN at 1.8V supply?
At VCC = 1.8V, the 24AA02UID-I/SN supports only 100 kHz I²C operation per DS20005202A. Minimum SCL high time is 4000 ns, minimum low time is 4700 ns, and maximum rise/fall times are 1000 ns. These values ensure reliable communication under low-voltage conditions where internal drive strength is reduced.
Can the 24AA02UID-I/SN be used in battery-powered applications with ultra-low power budgets?
Yes - the 24AA02UID-I/SN draws ≤1 µA standby current (ICCS) and ≤1 mA active read current (ICC), making it suitable for coin-cell or energy-harvesting systems. Its VCC threshold detector disables writes below ~1.5V, preventing data corruption during brown-out, and its I²C interface allows rapid wake-read-sleep cycles to minimize average power.
24AA02UID-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 128 x 8 x 2
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24AA02UID-I/SN FAQ
1.How can I place an order for 24AA02UID-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA02UID-I/SN 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 24AA02UID-I/SN reliable?
The price and inventory of 24AA02UID-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24AA02UID-I/SN is usually 5 days.
3.What payment methods are accepted for 24AA02UID-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA02UID-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA02UID-I/SN?
24AA02UID-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA02UID-I/SN 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 24AA02UID-I/SN?
For technical support, including 24AA02UID-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA02UID-I/SN requirements.
6.How does Aetrix verify that 24AA02UID-I/SN is sourced from the original manufacturer or authorized distributors?
All 24AA02UID-I/SN 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 24AA02UID-I/SN meets industry standards.
7.What is the process for return or replacement of 24AA02UID-I/SN?
All 24AA02UID-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24AA02UID-I/SN, 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 24AA02UID-I/SN part is unused and in its original packaging.
Return procedure for 24AA02UID-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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