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Microchip Technology 24AA02UIDT-I/SN
- Part No.:
- 24AA02UIDT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24AA02UIDT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,132
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Product details
Overview
24AA02UIDT-I/SN from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with a factory-programmed, globally unique 32-bit serial number stored in write-protected memory (0xFC–0xFF). It operates from 1.7V to 5.5V, supports 400 kHz I²C clock (100 kHz below 2.5V), features 8-byte page writes, and delivers ≤1 µA standby current and ≤1 mA read current. It is used for secure device identification in embedded systems requiring tamper-resistant UID storage.
For engineers reviewing the 24AA02UIDT-I/SN datasheet, 24AA02UIDT-I/SN pinout, 24AA02UIDT-I/SN application, or 24AA02UIDT-I/SN equivalent, key selection criteria include guaranteed uniqueness of the preprogrammed UID, industrial temperature range (−40°C to +85°C), SOT-23-5 package compatibility, I²C bus noise immunity via Schmitt-trigger inputs, and permanent upper-half memory write protection.
Technical Context
The 24AA02UIDT-I/SN implements a two-wire I²C slave interface with fixed 7-bit address prefix '1010' and no chip-select pins (A0–A2 unconnected), simplifying multi-device bus design. Its internal architecture includes a dedicated 32-bit UID block (0xFC–0xFF), manufacturer code (0xFA = 0x29), and device ID (0xFB = 0x41), all permanently write-protected.
It uses low-power CMOS technology with self-timed erase/write cycles, output slope control to suppress ground bounce, and VCC threshold detection that disables write logic below 1.5V. Memory is organized as two 128 × 8-bit blocks, with page write buffer limited to 8 bytes and automatic address pointer increment during sequential reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), with 1,024 bits user-accessible (0x00–0x7F) |
| UID length & location | 32-bit factory-programmed serial number at fixed addresses 0xFC–0xFF |
| I²C clock support | Up to 400 kHz at VCC ≥2.5V; 100 kHz at 1.7V ≤ VCC <2.5V |
| Page write capacity | 8-byte buffer; write wraps within page boundary (no cross-page writes) |
| Write protection | Upper half (0x80–0xFF) permanently write-protected; read accessible |
| Endurance & retention | 1 million erase/write cycles; data retention >200 years at +25°C |
| Supply voltage | 1.7V to 5.5V operation; enables battery-powered and low-voltage MCU interfacing |
Pinout & Package
24AA02UIDT-I/SN is supplied in a 5-lead SOT-23 package (JEDEC MO-178AA), with pin 1 marked by laser. The device has no A0/A1/A2 address pins - all are unconnected per datasheet DS20005202A, page 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCL) | Serial Clock input | Master-generated clock synchronizing all I²C transfers; Schmitt-triggered for noise immunity |
| 2 (VSS) | Ground reference | System return path; required for proper biasing of internal logic and EEPROM array |
| 3 (SDA) | Serial Data bidirectional I/O | Open-drain line requiring external pull-up; carries address, data, and ACK/NACK signals |
| 4 (NC) | No connect | Internally unconnected; must be left floating or tied to VSS/VCC per layout best practice |
| 5 (VCC) | Power supply | Accepts 1.7–5.5V; internal VCC detector disables writes below ~1.5V to prevent corruption |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed UID | 32-bit serial number guaranteed unique across all Microchip UID-family EEPROMs - eliminates need for field programming or host-side UID generation |
| Schmitt-trigger inputs | Input hysteresis ≥0.05×VCC on SCL/SDA - rejects bus noise spikes up to 50 ns without external filtering |
| Output slope control | Controlled SDA fall time (≤250 ns) and rise time (≤1000 ns) - prevents ground bounce and EMI during switching |
| Low-voltage operation | Functional down to 1.7V with ≤1 µA standby current - suitable for coin-cell and energy-harvesting applications |
| ESD robustness | ≥4,000V HBM on all pins - enhances reliability in handling-sensitive industrial and consumer assembly lines |
Applications
| IoT Device Authentication | Industrial Sensor Node ID |
|---|---|
Use Scenario: Embedded Linux gateway verifies peripheral sensor identity before enabling data ingestion. IC Role / Device Role / Timing Role: Provides cryptographically binding hardware root-of-trust via immutable 32-bit UID stored in write-protected memory. Use Value: Prevents counterfeit sensor substitution; enables firmware signature validation using UID-derived keys. | Use Scenario: Programmable logic controller (PLC) reads unique identifiers from connected analog input modules. IC Role / Device Role / Timing Role: Acts as nonvolatile, factory-assigned identity register accessible over standard I²C at ≤400 kHz. Use Value: Eliminates manual DIP-switch configuration; supports hot-swap module recognition without host reprogramming. |
| Medical Equipment Calibration | Automotive ECU Secure Boot |
Use Scenario: Portable ultrasound probe stores calibration coefficients and manufacturer traceability data. IC Role / Device Role / Timing Role: Stores 1Kb of user-configurable calibration parameters alongside fixed 32-bit UID for audit trail linkage. Use Value: Enables FDA-compliant device history tracking; UID ties calibration records to physical hardware unit. | Use Scenario: Body control module validates firmware authenticity using UID-based key derivation during boot. IC Role / Device Role / Timing Role: Supplies immutable hardware identifier used in HMAC-SHA256 key generation for secure boot chain. Use Value: Blocks unauthorized firmware updates; meets ISO/SAE 21434 cybersecurity requirements for automotive ECUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM with UID applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA02E48T-I/OT | Same 2 Kbit EEPROM + 32-bit UID, but in SOT-23-6 package with A0/A1 pins (not NC); supports cascading up to 4 devices | Requires A0/A1 routing and pull-up/down resistors; not drop-in compatible due to extra pin and different pinout | Select only if multi-device bus addressing is needed and PCB layout allows SOT-23-6 footprint |
| AT24CM01-SSHM-T | 2 Kbit I²C EEPROM with 128-bit UID (not preprogrammed); requires host-side UID initialization; no factory guarantee of global uniqueness | Lacks factory-programmed UID assurance; requires firmware provisioning step during manufacturing | Choose only when UID length >32-bit is mandatory and UID uniqueness can be managed in-system |
Compared with 24AA02UIDT-I/SN, the 24AA02E48T-I/OT adds addressability at the cost of pin count and layout compatibility, while the AT24CM01-SSHM-T trades guaranteed uniqueness for longer UID length and software-managed provisioning - neither offers pin-to-pin or functional drop-in replacement capability.
Availability
24AA02UIDT-I/SN is available at Aetrix Electronics and suitable for IoT device authentication, industrial sensor node ID, and medical equipment calibration requiring stable component supply across extended product lifecycles.
Supply support for 24AA02UIDT-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.
The 24AA02XUID family was designed specifically for secure, low-power device identification in resource-constrained embedded systems - emphasizing factory-programmed uniqueness, I²C simplicity, and industrial-grade reliability.
FAQ
What is the exact memory organization of the 24AA02UIDT-I/SN?
The 24AA02UIDT-I/SN contains 256 bytes (2 Kbit) of EEPROM organized as two 128 × 8-bit blocks. Addresses 0x00–0x7F (128 bytes) are user-writable; addresses 0x80–0xFF (128 bytes) are write-protected. The 32-bit UID resides at 0xFC–0xFF, with manufacturer code (0x29) at 0xFA and device ID (0x41) at 0xFB. This layout is fixed and cannot be altered.
Does the 24AA02UIDT-I/SN support multi-device I²C bus addressing?
No - the 24AA02UIDT-I/SN has no A0, A1, or A2 address pins (all NC per DS20005202A, page 6), so it uses a fixed I²C slave address of 0xA0 (write) / 0xA1 (read). Multiple 24AA02UIDT-I/SN devices cannot share the same I²C bus without external multiplexing, unlike the 24AA025UID variant which supports up to eight devices via A0–A2.
How is the 32-bit UID accessed and verified in firmware?
The 32-bit UID is read as four consecutive bytes starting at address 0xFC using standard I²C random or sequential read. Firmware verifies integrity by confirming the manufacturer code (0xFA = 0x29) and device ID (0xFB = 0x41) match expected values. No special command or unlock sequence is required - the UID is always readable and cannot be overwritten.
What are the absolute maximum ratings for the 24AA02UIDT-I/SN?
The absolute maximum ratings are: VCC = 6.5V, input/output voltage = −0.3V to VCC +1.0V, operating ambient temperature = −40°C to +85°C, and storage temperature = −65°C to +150°C. Exceeding these may cause permanent damage. The device also features ≥4 kV HBM ESD protection on all pins, validated per JEDEC JS-001.
Can the 24AA02UIDT-I/SN be used in battery-powered applications with 1.8V supply?
Yes - the 24AA02UIDT-I/SN is fully specified for operation down to 1.7V. At 1.8V, it supports 100 kHz I²C communication, draws ≤1 µA standby current, and maintains full read/write functionality. Its low-voltage design makes it suitable for coin-cell (CR2032) and single-LiFePO₄ powered systems where supply regulation is minimal.
24AA02UIDT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
24AA02UIDT-I/SN FAQ
1.How can I place an order for 24AA02UIDT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA02UIDT-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 24AA02UIDT-I/SN reliable?
The price and inventory of 24AA02UIDT-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 24AA02UIDT-I/SN is usually 5 days.
3.What payment methods are accepted for 24AA02UIDT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA02UIDT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA02UIDT-I/SN?
24AA02UIDT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA02UIDT-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 24AA02UIDT-I/SN?
For technical support, including 24AA02UIDT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA02UIDT-I/SN requirements.
6.How does Aetrix verify that 24AA02UIDT-I/SN is sourced from the original manufacturer or authorized distributors?
All 24AA02UIDT-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 24AA02UIDT-I/SN meets industry standards.
7.What is the process for return or replacement of 24AA02UIDT-I/SN?
All 24AA02UIDT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24AA02UIDT-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 24AA02UIDT-I/SN part is unused and in its original packaging.
Return procedure for 24AA02UIDT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24AA02UIDT-I/SN Tags
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