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Microchip Technology 24AA025UID-I/SN
- Part No.:
- 24AA025UID-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24AA025UID-I/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,513
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Product details
Overview
24AA025UID-I/SN from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with factory-programmed, globally unique 32-bit serial ID stored in write-protected memory (addresses 0xFC–0xFF). It operates from 1.7V to 5.5V, supports 400 kHz clock (100 kHz below 2.5V), and delivers 16-byte page writes with ≤3 ms typical write time. Used for secure device identification in industrial IoT nodes and embedded authentication systems.
For engineers reviewing the 24AA025UID-I/SN datasheet, 24AA025UID-I/SN pinout, 24AA025UID-I/SN application, or 24AA025UID-I/SN equivalent, key selection criteria include guaranteed UID uniqueness across Microchip's UID-family, industrial temperature range (−40°C to +85°C), SOT-23-6 package compatibility, and I²C bus noise immunity via Schmitt-trigger inputs and slope control.
Technical Context
The 24AA025UID-I/SN implements a slave-only I²C interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A2, A1, A0) enabling up to eight devices on one bus - four in SOT-23-6 due to missing A2 pin. Its internal address pointer auto-increments during sequential reads and wraps within page boundaries during page writes.
Memory is organized as two 128 × 8-bit blocks (2 Kbit total); the upper half (0x80–0xFF) is permanently write-protected, reserving 0xFC–0xFF for the immutable UID and 0xFA–0xFB for manufacturer code (0x29) and device ID (0x41). The device uses on-chip HV generation for EEPROM programming and includes VCC threshold detection to inhibit writes below 1.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit), with 1024 bits user-writable (0x00–0x7F) |
| Unique ID | Factory-programmed 32-bit serial number at 0xFC–0xFF; globally unique across all Microchip UID-family EEPROMs |
| I²C Clock Rate | Up to 400 kHz at VCC ≥ 2.5V; downgraded to 100 kHz below 2.5V - ensures timing compliance across full voltage range |
| Page Write Buffer | 16-byte buffer enables single-stop multi-byte writes; prevents partial updates and reduces bus overhead vs. byte writes |
| Endurance & Retention | 1 million erase/write cycles minimum; data retention >200 years at 85°C - validated for long-life industrial deployments |
| Supply Range | 1.7V to 5.5V operation with max 1 µA standby current - supports battery-powered and low-voltage MCU interfaces |
| ESD Protection | ≥4 kV HBM on all pins - enhances robustness in handling-sensitive manufacturing and field environments |
Pinout & Package
24AA025UID-I/SN is supplied in a RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA), with pin 1 identified by laser mark. Pin A2 is not connected in this package variant; A0 and A1 are functional chip-select inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 6) | Power supply input | Accepts 1.7–5.5V; powers internal logic and EEPROM programming circuitry |
| SCL (Pin 1) | Serial clock input | Master-generated clock synchronizing all I²C transfers; Schmitt-triggered for noise immunity |
| SDA (Pin 3) | Serial data I/O | Open-drain bidirectional line requiring external pull-up; slope-controlled to suppress ground bounce |
| VSS (Pin 2) | Ground reference | Return path for all internal currents; must be low-impedance to ensure noise margin |
| A0 (Pin 5) | Chip address input | LSB of 3-bit slave address; tied high/low to select device on shared I²C bus (up to 4 in SOT-23) |
| A1 (Pin 4) | Chip address input | MSB-1 of 3-bit slave address; determines unique I²C address alongside A0 (A2 not bonded) |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed UID | 32-bit factory-assigned serial number stored in write-protected memory - eliminates need for post-manufacture provisioning |
| Scalable Serial Number | Software-extensible to 48/64/128/256-bit lengths using adjacent reserved bytes (0xFA–0xFF) - supports custom security protocols |
| Noise-Resilient I²C Interface | Schmitt-trigger inputs + 50 ns input filter + controlled output slew - maintains reliable communication on noisy industrial PCBs |
| Write Protection | Hardware-enforced lock on upper memory block (0x80–0xFF) - prevents accidental overwrite of UID and device codes |
| Low-Voltage Operation | Full functionality down to 1.7V with <1 µA standby current - enables direct interfacing with 1.8V MCUs and energy-harvesting systems |
Applications
| Industrial Asset Tagging | Secure Boot Authentication |
|---|---|
Use Scenario: Permanent identification of field-deployed sensors, actuators, or PLC modules across multi-vendor supply chains. IC Role / Device Role / Timing Role: Nonvolatile UID storage element providing cryptographically verifiable hardware identity during commissioning and firmware update. Use Value: Eliminates manual serial number entry errors and enables automated inventory reconciliation via I²C scan without host MCU firmware changes. |
Use Scenario: Storing immutable root-of-trust keys or hash seeds in edge gateways prior to secure boot chain initialization. IC Role / Device Role / Timing Role: Tamper-resistant identity anchor referenced early in boot sequence to validate bootloader integrity. Use Value: Prevents cloning or counterfeiting by binding firmware images to hardware-specific UID, enforced by write-protection of UID region. |
| Medical Device Calibration | Smart Energy Metering |
Use Scenario: Recording factory calibration coefficients and sensor offset values in portable diagnostic equipment with strict traceability requirements. IC Role / Device Role / Timing Role: Dedicated calibration data repository accessed only during device power-up or service mode. Use Value: Guarantees calibration persistence across battery replacements and firmware upgrades while isolating UID from user-modifiable data. |
Use Scenario: Embedding unique meter IDs and tariff configuration flags in ANSI C12.19-compliant smart electricity meters. IC Role / Device Role / Timing Role: I²C-accessible identity module supporting AMI (Advanced Metering Infrastructure) registration and remote firmware validation. Use Value: Enables utility-grade device lifecycle tracking and regulatory audit trails using factory-guaranteed UID uniqueness. |
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 |
|---|---|---|---|
| 24AA02UID-I/SN | Same UID architecture and 2 Kbit density but 8-byte page buffer; no A0/A1/A2 pins - fixed single-device address | Limited to single-device I²C buses; unsuitable for multi-node systems requiring address differentiation | Select when board space allows SOIC-8 or PDIP-8 and only one UID EEPROM per bus is needed |
| AT24MAC402-MAHM-T | Microchip-compatible 2 Kbit EEPROM with 48-bit MAC-like UID; supports 1 MHz I²C; different memory map and write protection scheme | Includes IEEE 802.1AE-compliant MAC address format; lacks cascading capability for extended address space | Choose when MAC-standardized identifiers or higher-speed I²C are required, accepting different UID layout and no A0/A1 support |
Compared with 24AA025UID-I/SN, the 24AA02UID-I/SN offers simpler addressing but no multi-device support, while the AT24MAC402-MAHM-T provides faster clocking and standardized MAC formatting at the cost of altered UID structure and no cascaded addressing - making 24AA025UID-I/SN optimal for scalable industrial node identification.
Availability
24AA025UID-I/SN is available at Aetrix Electronics and suitable for industrial IoT node identification, secure boot authentication, and medical device calibration requiring stable component supply across extended product lifecycles.
Supply support for 24AA025UID-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 24AA025UID-I/SN belongs to Microchip's UID-family of serial EEPROMs, designed specifically for secure, factory-provisioned device identity in industrial, medical, and automotive applications where traceability and anti-cloning are critical.
FAQ
What is the exact memory organization of the 24AA025UID-I/SN?
The 24AA025UID-I/SN contains 2 Kbit (256 bytes) of EEPROM organized as two 128 × 8-bit blocks. Addresses 0x00–0x7F are user-writable; 0x80–0xFF 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 in the 24AA025UID-I/SN.
Does the 24AA025UID-I/SN support multi-device I²C bus configurations?
Yes - the 24AA025UID-I/SN supports up to four devices on a single I²C bus in its SOT-23-6 package (due to unconnected A2 pin), using A0 and A1 to configure unique 7-bit slave addresses. Each device responds only when its A0/A1 combination matches the corresponding bits in the control byte, enabling scalable node identification without external logic.
How is the unique 32-bit serial number guaranteed to be globally unique in the 24AA025UID-I/SN?
Microchip programs each 24AA025UID-I/SN with a factory-assigned 32-bit serial number during wafer sort, drawn from a centralized database ensuring no duplication across all UID-family devices (24AA02UID, 24AA025UID, and successors). This uniqueness is documented in DS20005202A and applies across all production lots and package variants of the 24AA025UID-I/SN.
Can the 24AA025UID-I/SN be used below 1.7V?
No - the 24AA025UID-I/SN is specified for 1.7V to 5.5V operation. Below 1.7V, internal voltage regulation and EEPROM programming circuits fail to meet timing and reliability specifications. A VCC threshold detector disables write operations below ~1.5V, but read functionality is not guaranteed outside the rated range. Operating the 24AA025UID-I/SN below 1.7V violates datasheet limits.
What is the maximum write endurance of the user-writable memory in the 24AA025UID-I/SN?
The user-writable memory region (0x00–0x7F) of the 24AA025UID-I/SN is rated for a minimum of 1 million erase/write cycles at 25°C, with data retention exceeding 200 years at 85°C. This endurance is characterized per JEDEC standards and applies only to the unprotected lower half - the UID region (0xFC–0xFF) is read-only and unaffected by endurance wear-out.
24AA025UID-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
24AA025UID-I/SN FAQ
1.How can I place an order for 24AA025UID-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA025UID-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 24AA025UID-I/SN reliable?
The price and inventory of 24AA025UID-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 24AA025UID-I/SN is usually 5 days.
3.What payment methods are accepted for 24AA025UID-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA025UID-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA025UID-I/SN?
24AA025UID-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA025UID-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 24AA025UID-I/SN?
For technical support, including 24AA025UID-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA025UID-I/SN requirements.
6.How does Aetrix verify that 24AA025UID-I/SN is sourced from the original manufacturer or authorized distributors?
All 24AA025UID-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 24AA025UID-I/SN meets industry standards.
7.What is the process for return or replacement of 24AA025UID-I/SN?
All 24AA025UID-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24AA025UID-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 24AA025UID-I/SN part is unused and in its original packaging.
Return procedure for 24AA025UID-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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