Microchip Technology AT24C32AY1-10YI-2.7

Overview

AT24C32AY1-10YI-2.7 from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) I²C-compatible serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports 400 kHz clock rate at 2.7V+, delivers 32-byte page write capability, and features hardware write protection via the WP pin. It is used in embedded systems for parameter storage, calibration data retention, and configuration backup.

For engineers reviewing the AT24C32AY1-10YI-2.7 datasheet, AT24C32AY1-10YI-2.7 pinout, AT24C32AY1-10YI-2.7 application, or AT24C32AY1-10YI-2.7 equivalent, key selection criteria include its 2.7V–5.5V supply range, 8-lead MAP package (4.90 mm × 3.00 mm), -40°C to +85°C industrial temperature grade, 1 million write cycles endurance, and 100-year data retention - all critical for long-life, space-constrained, automotive-adjacent, and industrial control designs.

Technical Context

The AT24C32AY1-10YI-2.7 implements a standard two-wire (I²C) interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. It uses three address pins (A0–A2) to support up to eight devices on a shared bus and includes a dedicated Write Protect (WP) pin for hardware-level memory locking.

Internally organized as 128 pages of 32 bytes each, it supports both byte and page write modes with self-timed internal write cycles (max 5 ms). Its standby current is 2.0 µA at VCC = 2.7V, and it complies with I²C timing requirements including tLOW ≥ 1.3 µs and tHIGH ≥ 0.6 µs at 400 kHz operation.

Key Specifications

Pinout & Package

AT24C32AY1-10YI-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 SOIC/TSSOP land patterns. Pin 1 is marked by an index area on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32AY1-10YI-2.7, the AT24C32D-SSHM-T offers SOIC compatibility at the cost of board space, while the M24C32-WMN6TP extends low-voltage operation but trades off standby current efficiency - both require validation of WP pin response and page-write timing in target host firmware.

Availability

AT24C32AY1-10YI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, smart energy metering, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for AT24C32AY1-10YI-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 acquired Atmel in 2016 and maintains full product continuity, quality assurance, and long-term supply commitment for the AT24C series EEPROMs.

The AT24C32A family was designed specifically for reliable, low-power, I²C-based nonvolatile storage in space-constrained industrial and automotive applications - emphasizing write endurance, data retention, and noise-immune communication.

FAQ

What is the maximum I²C clock frequency supported by AT24C32AY1-10YI-2.7?

The AT24C32AY1-10YI-2.7 supports up to 400 kHz clock frequency when operating at VCC ≥ 2.7V. This is validated per AC characteristics in the datasheet (tLOW ≥ 1.3 µs, tHIGH ≥ 0.6 µs). Operation at 100 kHz is guaranteed down to 1.8V, but the -2.7 suffix indicates this variant is optimized for 2.7V–5.5V systems where 400 kHz is fully supported. The AT24C32AY1-10YI-2.7 does not support standard-mode Fast-mode Plus (1 MHz) timing.

Does AT24C32AY1-10YI-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C32AY1-10YI-2.7 requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time; 4.7 kΩ is commonly used for 400 kHz operation with ≤400 pF total bus capacitance. The AT24C32AY1-10YI-2.7 itself contains no internal pull-ups.

How does the Write Protect (WP) pin function on AT24C32AY1-10YI-2.7?

When the WP pin of AT24C32AY1-10YI-2.7 is driven high (≥0.7 × VCC), all write operations - including byte, page, and write-cycle commands - are inhibited. When WP is low (≤0.3 × VCC) or floating (internally pulled down if capacitive coupling <3 pF), normal write access is enabled. This hardware lock operates independently of I²C commands and provides deterministic protection against firmware errors or voltage glitches.

What is the physical package type of AT24C32AY1-10YI-2.7?

AT24C32AY1-10YI-2.7 uses an 8-lead Miniature Array Package (MAP), designated as 8Y1 in Microchip's ordering guide. It measures 4.90 mm × 3.00 mm with a 0.65 mm lead pitch, non-leaded construction, and dual footprint compatibility with SOIC and TSSOP land patterns. Pin 1 is identified by a corner index mark on the top surface.

Can AT24C32AY1-10YI-2.7 be used in automotive under-hood applications?

No - AT24C32AY1-10YI-2.7 is rated for industrial temperature range (-40°C to +85°C), not automotive extended grade (-40°C to +125°C). For under-hood use, Microchip offers variants like AT24C32AN-10SE-2.7 (125°C) or AT24C32AN-10SQ-2.7 (125°C, halogen-free). The AT24C32AY1-10YI-2.7 is suitable for cabin-mounted ECUs, infotainment systems, and body control modules outside engine compartments.