Microchip Technology AT24C128Y1-10YI-2.7

Overview

AT24C128Y1-10YI-2.7 from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM operating from 2.7V to 5.5V, featuring 64-byte page write mode, 1 MHz I²C compatibility at 5V, and hardware write protection via the WP pin. It supports industrial temperature range (−40°C to +85°C) in an 8-lead MAP package and is used for configuration storage in embedded controllers, power supply monitors, and sensor calibration data retention.

For engineers reviewing the AT24C128Y1-10YI-2.7 datasheet, AT24C128Y1-10YI-2.7 pinout, AT24C128Y1-10YI-2.7 application, or AT24C128Y1-10YI-2.7 equivalent, key selection considerations include its 2.7–5.5 V supply range, 1 million write endurance, 40-year data retention, 8-lead MAP footprint, and I²C timing compliance at 1 MHz (5V), 400 kHz (2.7V), and 100 kHz (1.8V).

Technical Context

The AT24C128Y1-10YI-2.7 implements a standard I²C-compatible two-wire interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its internal address counter supports current-address, random-address, and sequential read modes, while page write logic enables up to 64 bytes per transaction with automatic lower-bit address incrementing.

It uses hardwired A0/A1 pins for device addressing (up to four devices on one bus), includes an active-high write protect (WP) pin that disables all writes when tied to VCC, and features acknowledge polling to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

AT24C128Y1-10YI-2.7 is housed in an 8-lead Miniature Array Package (MAP), 4.90 mm × 3.00 mm body, non-leaded, with exposed pad not electrically connected. Pin 1 is marked by index area in top-left corner of package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128Y1-10YI-2.7, AT24C128-10TI-2.7 offers identical functionality in a larger TSSOP package for easier assembly, while M24C128-WMN6TP adds AEC-Q100 qualification at the cost of slightly relaxed AC timing margins - making each suitable for distinct mechanical or compliance-driven design constraints.

Availability

AT24C128Y1-10YI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and power supply monitoring applications requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for AT24C128Y1-10YI-2.7 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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on reliability, longevity, and embedded system integration.

The AT24C128Y1-10YI-2.7 belongs to Microchip's AT24Cxx serial EEPROM family, designed for low-power, space-constrained applications requiring robust nonvolatile storage in industrial, computing, and communications equipment.

FAQ

What is the maximum I²C clock frequency supported by the AT24C128Y1-10YI-2.7?

The AT24C128Y1-10YI-2.7 supports up to 1 MHz I²C clock frequency when operated at 5.0 V, 400 kHz at 2.7 V, and 100 kHz at 1.8 V. These ratings are specified in the AC characteristics table and apply across the full industrial temperature range. The device maintains timing compliance without external acceleration circuitry, making AT24C128Y1-10YI-2.7 suitable for high-speed configuration loading in real-time control systems.

Does the AT24C128Y1-10YI-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C128Y1-10YI-2.7 requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Recommended values range from 1 kΩ to 10 kΩ depending on bus capacitance and speed requirements - 4.7 kΩ is typical for 400 kHz operation. Without proper pull-ups, AT24C128Y1-10YI-2.7 will fail to drive valid logic levels or respond to master commands.

How does the write protect (WP) pin function on the AT24C128Y1-10YI-2.7?

The WP pin on AT24C128Y1-10YI-2.7 is an active-high hardware lock: when tied to VCC, it inhibits all write operations including byte, page, and erase commands; when grounded, normal write functionality is enabled. Floating WP defaults to GND via internal bias if board coupling is <3 pF. This feature prevents unintended memory corruption during power transitions, making AT24C128Y1-10YI-2.7 ideal for safety-critical configuration storage.

What package type is used for the AT24C128Y1-10YI-2.7, and what are its key mechanical dimensions?

The AT24C128Y1-10YI-2.7 uses an 8-lead Miniature Array Package (MAP), designated 8Y1, with nominal dimensions of 4.90 mm × 3.00 mm × 0.90 mm. It features gull-wing leads, dual footprint compatibility, and a pin 1 index area in the top-left corner. This compact, lead-free/halogen-free package supports fine-pitch automated assembly and fits tightly routed PCBs where space is constrained - a key differentiator versus SOIC or TSSOP variants of AT24C128Y1-10YI-2.7.

Can the AT24C128Y1-10YI-2.7 be used in systems powered by 1.8 V?

No, the AT24C128Y1-10YI-2.7 is specifically rated for 2.7 V to 5.5 V operation, as indicated by the "-2.7" suffix in its ordering code. For 1.8 V systems, Microchip offers the AT24C128Y1-10YI-1.8 variant, which has different internal voltage regulation and timing specifications. Using AT24C128Y1-10YI-2.7 below 2.7 V may result in unreliable I²C communication, incomplete writes, or premature data loss - always match the supply voltage to the suffix designation.