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Microchip Technology 24AA025UIDT-I/SN
- Part No.:
- 24AA025UIDT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24AA025UIDT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,502
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Product details
Overview
24AA025UIDT-I/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with factory-programmed, globally unique 32-bit serial ID stored in write-protected memory (0xFC–0xFF). It operates from 1.7V to 5.5V, supports 400 kHz clock (100 kHz below 2.5V), features 16-byte page write buffer, and delivers ≤1 µA standby current. It serves as secure device identity storage in embedded systems requiring tamper-resistant hardware IDs.
For engineers reviewing the 24AA025UIDT-I/SN datasheet, 24AA025UIDT-I/SN pinout, 24AA025UIDT-I/SN application, or 24AA025UIDT-I/SN equivalent, key selection criteria include guaranteed uniqueness of factory-programmed UID, industrial temperature range (−40°C to +85°C), SOT-23-6 package compatibility, cascading capability via A0/A1 address pins, and write-protection of upper memory block (0x80–0xFF).
Technical Context
The 24AA025UIDT-I/SN implements a 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 re-addressing.
It uses on-chip high-voltage generation for EEPROM programming and includes a VCC threshold detector that disables erase/write logic below 1.5V. The device supports byte and page write modes, with self-timed write cycles (max 5 ms) and acknowledge polling for bus efficiency.
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; permanently write-protected |
| Page size | 16-byte page buffer enables efficient burst writes without host-side timing constraints |
| VCC range | 1.7V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers |
| Write endurance | ≥1 million erase/write cycles - suitable for infrequent but mission-critical ID updates |
| Data retention | >200 years at +85°C - ensures long-term validity of device identity across product lifecycle |
| I²C speed | Up to 400 kHz (≥2.5V); 100 kHz (1.7V–2.5V) - compatible with standard and fast-mode I²C masters |
| ESD protection | >4 kV HBM - robust against handling and board-level electrostatic discharge events |
Pinout & Package
24AA025UIDT-I/SN is supplied in a RoHS-compliant 6-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm body, 0.95 mm pitch). Pin 1 is laser-marked; pin 1 location is indicated by dot or bevel. No NC pins are internally connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.7–5.5V; powers internal logic and EEPROM array; requires local decoupling (0.1 µF) |
| SCL | Serial clock input | Open-drain compatible; master-generated clock synchronizes all I²C transfers |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up (2 kΩ typical for 400 kHz) |
| VSS | Ground reference | Return path for VCC and signal currents; must be low-impedance connection to system GND |
| A0 | Chip address input | LSB of 3-bit slave address; sets bit 0 of control byte; tied to VSS or VCC for multi-device bus addressing |
| A1 | Chip address input | Bit 1 of slave address; enables up to four devices on same bus in SOT-23 package (A2 not bonded) |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed UID | 32-bit globally unique identifier factory-written and permanently write-protected - eliminates need for post-manufacture provisioning |
| Cascadable addressing | A0/A1 pins enable up to four 24AA025UIDT-I/SN devices on one I²C bus - simplifies multi-node identity management |
| Noise-immune interface | Schmitt-trigger inputs + 50 ns input filter + controlled output slew rate - ensures reliable operation in electrically noisy environments |
| Low-power operation | 1 µA max standby current and 1 mA max active read current - extends battery life in portable and energy-constrained systems |
| Hardware write protection | Upper half (0x80–0xFF) including UID block is permanently locked - prevents accidental or malicious overwrite of identity data |
| Extended serial number support | Manufacturer code (0xFA = 0x29) and device ID (0xFB = 0x41) enable software-padded extensions to 48/64/128/256-bit IDs - meets diverse security protocol requirements |
Applications
| Secure Device Authentication | IoT Node Identity Management |
|---|---|
|
Use Scenario: Embedded Linux gateway validates peripheral authenticity before establishing TLS session. IC Role / Device Role / Timing Role: Provides immutable hardware root-of-trust via factory-programmed UID accessed over I²C during boot-time attestation. Use Value: Eliminates software-only identity spoofing; enables cryptographic binding of firmware to physical hardware using UID-derived keys. |
Use Scenario: Smart sensor node reports telemetry with cryptographically signed payload containing unique device ID. IC Role / Device Role / Timing Role: Supplies persistent, unclonable 32-bit serial number used as entropy source and device identifier in signing algorithm. Use Value: Enables scalable zero-touch provisioning and per-device certificate enrollment without centralized ID assignment infrastructure. |
| Industrial Equipment Calibration | Medical Device Traceability |
|
Use Scenario: Programmable logic controller stores calibration coefficients and manufacturer serial ID in nonvolatile memory. IC Role / Device Role / Timing Role: Stores calibrated parameters and immutable UID in separate protected memory regions; accessed via I²C during startup. Use Value: Ensures regulatory compliance (e.g., ISO 13485) by linking calibration records to specific hardware unit via factory-assigned ID. |
Use Scenario: Portable diagnostic instrument logs usage history and service events tied to individual unit ID. IC Role / Device Role / Timing Role: Host MCU reads preprogrammed UID at power-on to populate audit trail headers and enforce firmware version locks. Use Value: Meets FDA UDI requirements by providing permanent, unalterable device identifier traceable to manufacturing lot and date code. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM with unique ID applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA02E48T-I/OT | Same 2 Kbit capacity and UID, but in 5-lead SOT-23; lacks A0/A1 pins - no cascading support | Single-device systems where space is critical and multi-drop bus not required | Select when footprint minimization outweighs address flexibility; verify mechanical fit for 5-pin vs. 6-pin SOT-23 |
| AT24MAC402-MAHM-T | Microchip-licensed MAC address + UID; 4-Kbit density; supports 1-MHz I²C; different UID format (EUI-48) | Networked devices requiring IEEE 802 MAC address alongside unique ID | Choose when Ethernet/Wi-Fi MAC is needed; note different memory map and write-protection scheme |
Compared with 24AA025UIDT-I/SN, the 24AA02E48T-I/OT sacrifices address scalability for smaller footprint, while the AT24MAC402-MAHM-T adds MAC functionality at higher cost and complexity - 24AA025UIDT-I/SN remains optimal for pure, cascaded UID storage in space-constrained industrial designs.
Availability
24AA025UIDT-I/SN is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and IoT edge node applications requiring stable component supply, guaranteed UID uniqueness, and long-term obsolescence management.
Supply support for 24AA025UIDT-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24AA02XUID family was designed specifically to deliver factory-programmed, cryptographically viable unique identifiers for secure device authentication and traceability in resource-constrained embedded systems.
FAQ
What is the exact memory organization of the 24AA025UIDT-I/SN?
The 24AA025UIDT-I/SN contains 256 bytes (2 Kbit) of EEPROM, split into two 128-byte blocks. The upper block (0x80–0xFF) is write-protected and holds the 32-bit UID (0xFC–0xFF), manufacturer code (0xFA), and device ID (0xFB). The lower block (0x00–0x7F) is user-programmable with full read/write access. This layout ensures identity integrity while preserving application storage space.
Is the 32-bit UID truly unique across all units of 24AA025UIDT-I/SN?
Yes - the 32-bit serial number in each 24AA025UIDT-I/SN is globally unique across the entire Microchip UID-family EEPROM portfolio. It is programmed during wafer sort using a deterministic, collision-free algorithm and verified prior to shipment. No two 24AA025UIDT-I/SN devices share the same UID value.
Can the 24AA025UIDT-I/SN be used in a multi-device I²C bus configuration?
Yes - the 24AA025UIDT-I/SN supports cascading via its A0 and A1 address pins, allowing up to four devices on the same I²C bus in the SOT-23-6 package. Each device responds only when its A0/A1 combination matches the corresponding bits in the master's control byte, enabling independent UID access without bus contention.
What is the purpose of the write-protection on the upper memory block of the 24AA025UIDT-I/SN?
The upper memory block (0x80–0xFF) of the 24AA025UIDT-I/SN is permanently write-protected to safeguard the factory-programmed UID, manufacturer code, and device ID. This hardware-enforced lock prevents accidental or malicious overwrite during field operation, ensuring the device identity remains immutable throughout its operational lifetime.
Does the 24AA025UIDT-I/SN support extended serial number lengths beyond 32 bits?
Yes - the 24AA025UIDT-I/SN supports software-extended serial numbers up to 256 bits by reading additional bytes (e.g., 0xF0–0xFF for 128-bit) alongside the base 32-bit UID. Manufacturer code (0xFA = 0x29) and device ID (0xFB = 0x41) provide fixed prefixes, enabling deterministic padding while preserving uniqueness across extended formats.
24AA025UIDT-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
24AA025UIDT-I/SN FAQ
1.How can I place an order for 24AA025UIDT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA025UIDT-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 24AA025UIDT-I/SN reliable?
The price and inventory of 24AA025UIDT-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 24AA025UIDT-I/SN is usually 5 days.
3.What payment methods are accepted for 24AA025UIDT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA025UIDT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA025UIDT-I/SN?
24AA025UIDT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA025UIDT-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 24AA025UIDT-I/SN?
For technical support, including 24AA025UIDT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA025UIDT-I/SN requirements.
6.How does Aetrix verify that 24AA025UIDT-I/SN is sourced from the original manufacturer or authorized distributors?
All 24AA025UIDT-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 24AA025UIDT-I/SN meets industry standards.
7.What is the process for return or replacement of 24AA025UIDT-I/SN?
All 24AA025UIDT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24AA025UIDT-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 24AA025UIDT-I/SN part is unused and in its original packaging.
Return procedure for 24AA025UIDT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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