Microchip Technology AT24C128Y1-10YU-1.8

Overview

AT24C128Y1-10YU-1.8 from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8 V to 3.6 V, supports 100 kHz I²C bus speed at 1.8 V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 40-year data retention. It is used in industrial sensor calibration storage, power meter firmware parameter backup, and IoT device configuration persistence.

For engineers reviewing the AT24C128Y1-10YU-1.8 datasheet, AT24C128Y1-10YU-1.8 pinout, AT24C128Y1-10YU-1.8 application, or AT24C128Y1-10YU-1.8 equivalent, key selection considerations include its 1.8 V operation range, 8-lead MAP package (4.90 mm × 3.00 mm), 64-byte page write capability, Schmitt-triggered noise-immune inputs, and compatibility with standard I²C protocol timing at industrial temperature (–40°C to +85°C).

Technical Context

The AT24C128Y1-10YU-1.8 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and edge-triggered SCL, supporting up to four devices on a shared bus via A0/A1 address pins. Its memory is organized as 256 pages of 64 bytes each, enabling efficient partial-page writes without cross-page rollover within a single write transaction.

It uses internal address latching and auto-incrementing during sequential reads, supports acknowledge polling for write-cycle completion detection, and incorporates Schmitt-trigger inputs with RC filtering to suppress EMI-induced glitches on SDA/SCL lines - critical for noisy industrial environments where stable communication must be maintained under variable supply and temperature conditions.

Key Specifications

Pinout & Package

AT24C128Y1-10YU-1.8 is housed in an 8-lead Miniature Array Package (MAP), RoHS-compliant and halogen-free, with dimensions 4.90 mm × 3.00 mm × 0.90 mm (max height). The package features dual footprint compatibility and exposed pad-less construction suitable for reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with AT24C128Y1-10YU-1.8, the AT24C128B-SSHM-T provides extended temperature qualification and improved ESD tolerance for next-gen designs, while the M24128-BWMN6TP offers drop-in SOIC compatibility at the cost of pinout revision and vendor-specific timing behavior.

Availability

AT24C128Y1-10YU-1.8 is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, and IoT edge gateway designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C128Y1-10YU-1.8 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 acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT24Cxx EEPROM family, ensuring long-term support and documentation access.

The AT24C128Y1-10YU-1.8 belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, space-constrained embedded systems requiring reliable, low-power nonvolatile storage with I²C interface simplicity.

FAQ

What is the maximum I²C clock frequency supported by AT24C128Y1-10YU-1.8 at 1.8 V?

The AT24C128Y1-10YU-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V. This is specified in Table 4 (AC Characteristics – Industrial Temperatures) and reflects timing margins needed to ensure reliable communication under low-voltage conditions. Higher frequencies (400 kHz/1 MHz) require ≥2.5 V supply and are not guaranteed for AT24C128Y1-10YU-1.8.

Does AT24C128Y1-10YU-1.8 support page write operations, and what is the page size?

Yes, AT24C128Y1-10YU-1.8 supports 64-byte page write operations. The memory is internally organized into 256 pages of 64 bytes each, allowing up to 64 sequential bytes to be written in a single I²C transaction. This significantly improves write efficiency compared to byte-write mode and is essential for fast firmware or configuration updates.

How is write protection implemented on AT24C128Y1-10YU-1.8?

AT24C128Y1-10YU-1.8 implements hardware write protection via the WP (Write Protect) pin. When WP is driven high to VCC, all write operations - including byte, page, and erase - are inhibited. When WP is tied to GND, normal write functionality is enabled. If left floating, the pin is internally pulled down, defaulting to write-enabled mode.

What package type does AT24C128Y1-10YU-1.8 use, and what are its key mechanical dimensions?

AT24C128Y1-10YU-1.8 uses the 8-lead Miniature Array Package (MAP), designated as 8Y1 in Microchip's ordering matrix. Its body measures 4.90 mm × 3.00 mm, with maximum height of 0.90 mm. It features dual footprint compatibility and is lead-free/halogen-free, compliant with RoHS Directive 2011/65/EU.

Is AT24C128Y1-10YU-1.8 recommended for new designs, and what is the suggested migration path?

No - AT24C128Y1-10YU-1.8 is marked "not recommended for new design" per Microchip's datasheet revision history (0670T, March 2007). For new projects, Microchip recommends migrating to the AT24C128B series (e.g., AT24C128B-SSHM-T), which offers extended temperature support (–40°C to +125°C), improved ESD robustness, and continued long-term availability.