Microchip Technology AT24C01AY1-10YU-2.7

Overview

AT24C01AY1-10YU-2.7 from Microchip Technology (formerly Atmel) is a 1K-bit (128 × 8) I²C-compatible serial EEPROM optimized for low-voltage embedded systems. It operates from 2.7V to 5.5V, supports 100 kHz I²C clocking, features hardware write protection via the WP pin, and delivers 1 million write cycles with 100-year data retention - used in firmware parameter storage, calibration data logging, and configuration memory in industrial controllers.

For engineers reviewing the AT24C01AY1-10YU-2.7 datasheet, AT24C01AY1-10YU-2.7 pinout, AT24C01AY1-10YU-2.7 application, or AT24C01AY1-10YU-2.7 equivalent, key selection criteria include its 8-pin MAP package footprint, 2.7–5.5 V supply range, 100 kHz I²C timing compliance at 2.7V, page-write capability (8-byte pages), and automotive-grade temperature support (–40°C to +85°C).

Technical Context

The AT24C01AY1-10YU-2.7 implements a standard two-wire I²C interface with open-drain SDA and active-high SCL, using Schmitt-trigger inputs for noise immunity. Its internal address counter enables sequential reads, and device addressing uses hardwired A0–A2 pins to support up to eight devices on one bus.

Write operations are controlled by the WP pin: grounded for full read/write access, tied to VCC to protect the entire 1K array. The EEPROM uses self-timed internal write cycles (≤5 ms), with acknowledge polling supported to detect completion without fixed delays.

Key Specifications

Pinout & Package

AT24C01AY1-10YU-2.7 is housed in an 8-lead Miniature Array Package (MAP), 4.90 mm × 3.00 mm body, non-leaded, dual footprint - compatible with space-constrained PCB layouts and reflow-solderable per JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01AY1-10YU-2.7, the AT24C02D-10TU-2.7 doubles memory while maintaining pin compatibility in TSSOP, whereas M24C01-RMN6TP offers faster I²C but demands PCB layout change - both require validation of WP pin behavior and endurance under identical thermal profiles.

Availability

AT24C01AY1-10YU-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, smart sensors, medical diagnostics, and consumer appliance designs requiring stable component supply, long-lifecycle support, and automotive-grade reliability.

Supply support for AT24C01AY1-10YU-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 embedded control and connectivity.

The AT24C01A family was designed for cost-sensitive, space-constrained systems needing robust, low-power nonvolatile storage - especially in industrial automation, automotive subsystems, and IoT edge nodes.

FAQ

What is the maximum I²C clock frequency supported by AT24C01AY1-10YU-2.7?

The AT24C01AY1-10YU-2.7 supports up to 100 kHz I²C clock frequency when operating at 2.7V. This is specified in the AC Characteristics table of the official datasheet (0180R–SEEPR–4/04). Higher speeds (e.g., 400 kHz) require VCC ≥ 2.5V - not guaranteed for this -2.7 variant. Always verify timing margins with actual bus capacitance and pull-up strength in your design.

Does AT24C01AY1-10YU-2.7 support partial page writes?

Yes, AT24C01AY1-10YU-2.7 supports partial page writes: up to 8 bytes can be written in a single I²C transaction, starting at any byte address within a page. The internal address pointer auto-increments, and crossing a page boundary wraps to the start of the same page - enabling flexible updates without full-page erasure.

What package type is used for AT24C01AY1-10YU-2.7?

AT24C01AY1-10YU-2.7 uses the 8-lead Miniature Array Package (MAP), designated as 8Y1 in Microchip's ordering nomenclature. It measures 4.90 mm × 3.00 mm with a 0.65 mm lead pitch, non-leaded, and dual footprint - optimized for high-density PCB layouts and automated assembly.

How does the Write Protect (WP) pin function on AT24C01AY1-10YU-2.7?

On AT24C01AY1-10YU-2.7, the WP pin provides hardware-level write protection: when pulled high to VCC, it disables all write operations to the entire 1K memory array. When grounded, full read/write access is enabled. This prevents inadvertent writes during power-up/down or firmware errors - critical for safeguarding calibration data.

Is AT24C01AY1-10YU-2.7 qualified for automotive applications?

AT24C01AY1-10YU-2.7 is rated for industrial temperature (–40°C to +85°C) and labeled "Automotive Grade" in Microchip's documentation, indicating qualification to AEC-Q100 stress test requirements for reliability and robustness. However, it is not AEC-Q100 certified out-of-box - system-level validation is required for automotive use cases.