24AA256UID-I/ST Microchip Integrated Circuit (Small Outline Packages) In Stock
24AA256UID-I/ST is a Microchip 256 Kbit (32 Kx8) I2C serial EEPROM in an 8-pin TSSOP package operating from 1.7 V to 5.5 V. It supports 400 kHz I2C Fast Mode, delivers 1 million write/erase cycle endurance, and guarantees 200-year data retention. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- 24AA256UID-I/ST Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.9600(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of 24AA256UID-I/ST?
- 256 Kbit (32 Kx8) capacity with 1,000,000 write/erase cycle endurance and 200-year data retention
- Wide 1.7 V to 5.5 V supply range covering 1.8 V, 3.3 V, and 5 V systems with a single part
- 400 kHz Fast Mode I2C interface in a compact 8-pin TSSOP-8 package for space-constrained designs
- Unique device identification (UID) feature for factory serialization and clone prevention
What is 24AA256UID-I/ST used for?
24AA256UID-I/ST is used for storing calibration data, configuration parameters, and non-volatile log records in industrial sensors, medical instruments, and IoT edge devices operating on 1.8 V to 5 V supplies. Its unique factory-programmed UID simplifies device serialization, enabling anti-counterfeiting and field tracking without adding a separate serial number IC. The TSSOP-8 package is well-suited for wearable electronics, smart meters, and battery-powered data loggers where board area and power budget are tightly constrained.
What are the specifications of 24AA256UID-I/ST?
| Manufacturer Package Code | TSSOP-8 |
| Factory Lead Time | 6Weeks |
| YTEOL | 13 |
| Additional Feature | ALSO OPERATES AT 1.7V TO 2.5V @ 0.1MHZ |
| Clock Frequency-Max (fCLK) | 0.4MHz |
| Data Retention Time-Min | 200 |
| Endurance | 1000000 Write/Erase Cycles |
| I2C Control Byte | 1010DDDR |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Memory Density | 262144bit |
| Memory IC Type | EEPROM |
| Memory Width | 8 |
| Number of Functions | 1 |
| Number of Ports | 1 |
| Number of Words | 32768words |
| Number of Words Code | 32000 |
| Operating Mode | SYNCHRONOUS |
| Organization | 32KX8 |
| Output Characteristics | OPEN-DRAIN |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Parallel/Serial | SERIAL |
| Programming Voltage | 4.5V |
| Screening Level | TS 16949 |
| Serial Bus Type | I2C |
| Standby Current-Max | 0.000001A |
| Supply Current-Max | 0.003mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2.5V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Write Cycle Time-Max (tWC) | 5ms |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.32.00.51 |
| Country of Origin | Philippines, Thailand |
Where can I find the 24AA256UID-I/ST datasheet?
24AA256UID-I/ST Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for 24AA256UID-I/ST?
Compatible alternatives and drop-in replacements for 24AA256UID-I/ST:
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Frequently Asked Questions
How many write cycles does 24AA256UID-I/ST support before endurance degradation begins, and what does that mean for a daily-logging application?
24AA256UID-I/ST is rated for 1,000,000 write/erase cycles per byte location. For a data logger writing one record per day to a fixed address, that endurance exceeds 2,700 years of operation, making endurance effectively unlimited for typical embedded logging scenarios. For high-frequency writes such as 10 writes per second to a single byte, the endurance budget lasts approximately 27 hours, so wear-leveling across the 32 KB address space is required.
At 1.7 V supply, what I2C clock rate can 24AA256UID-I/ST sustain, and is it compatible with a 1.8 V LDO-powered MCU?
At supply voltages between 1.7 V and 2.5 V, 24AA256UID-I/ST operates at up to 100 kHz (Standard Mode I2C). At 2.5 V to 5.5 V, it supports up to 400 kHz Fast Mode. A 1.8 V MCU system is compatible at 100 kHz, and pull-up resistors to 1.8 V keep the bus voltage within the device's input high threshold for correct data latching.
What role does the UID feature play in a production line programming and anti-counterfeiting strategy for a consumer device?
The unique device identifier (UID) in 24AA256UID-I/ST is factory-laser-programmed into a protected address range that cannot be overwritten. During production, the MCU firmware reads the UID over I2C and registers it with a secure provisioning server, binding the hardware to a software license or warranty record. Any counterfeit board using a generic EEPROM without a valid UID can be detected at first power-on, adding a low-cost layer of hardware authentication without a dedicated secure element.
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More from Microchip
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.2100 | $1.21 |
| 100+ | $1.0600 | $106.00 |
| 400+ | $1.0100 | $404.00 |
| 5000+ | $0.9600 | $4800.00 |
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