Microchip Technology AT24C32AW-10SI-2.7

Overview

AT24C32AW-10SI-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 2.5–5.0 V, features hardware write protection via WP pin, 32-byte page write mode, and guarantees 1 million write cycles with 100-year data retention. It is used in embedded systems for parameter storage, calibration data logging, and configuration backup.

For engineers reviewing the AT24C32AW-10SI-2.7 datasheet, AT24C32AW-10SI-2.7 pinout, AT24C32AW-10SI-2.7 application, or AT24C32AW-10SI-2.7 equivalent, key selection considerations include its 8-lead SOIC package, 2.7V supply compatibility, I²C bus addressability (A0–A2), WP-enabled hardware lock, and guaranteed endurance under industrial temperature (−40°C to +85°C).

Technical Context

The AT24C32AW-10SI-2.7 implements a standard two-wire I²C interface with open-drain SDA and edge-triggered SCL, supporting bidirectional data transfer and device addressing via three hardware-configurable pins (A0–A2). It uses Schmitt-trigger inputs and internal noise filtering to ensure robust operation in electrically noisy environments.

Internally organized as 128 pages of 32 bytes each, it supports byte and page write modes with self-timed internal write cycles (max 5 ms), automatic address incrementing during sequential reads, and acknowledge polling for write completion detection - all compliant with I²C protocol timing requirements across its full voltage and temperature range.

Key Specifications

Pinout & Package

AT24C32AW-10SI-2.7 is supplied in an 8-lead JEDEC SOIC (8S1) package: 0.150" wide, gull-wing leads, body size 5.00 mm × 4.00 mm × 1.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C32-WMN6TP and CAT24C32WI-GT3, the AT24C32AW-10SI-2.7 provides tighter 2.7V minimum supply assurance, documented 2.0 µA standby at 2.7V, and explicit industrial temperature validation - making it preferred for 3.3V systems with strict power budget constraints and long-life field deployments.

Availability

AT24C32AW-10SI-2.7 is available at Aetrix Electronics and suitable for industrial automation, smart sensor design, and energy metering applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for AT24C32AW-10SI-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 technical and manufacturing continuity for the AT24Cxx EEPROM family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and consumer markets.

The AT24C32AW-10SI-2.7 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in space-constrained industrial and automotive control systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C32AW-10SI-2.7?

The AT24C32AW-10SI-2.7 supports up to 400 kHz I²C clock frequency when operated at VCC ≥ 2.5V. At 2.7V supply, this full speed is maintained per AC characteristics table in the datasheet. Operation at 100 kHz is guaranteed down to 1.8V, but the -2.7 variant is rated for 400 kHz across its entire 2.7–5.5V range.

Does AT24C32AW-10SI-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C32AW-10SI-2.7 requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time; Microchip recommends 4.7 kΩ for standard 100–400 kHz operation with ≤400 pF total bus capacitance.

How does the Write Protect (WP) pin function on AT24C32AW-10SI-2.7?

On AT24C32AW-10SI-2.7, the WP pin is active-high: when tied to VCC, all write operations (byte, page, and write-enable commands) are inhibited; when grounded, normal writes are permitted. If left floating, an internal weak pull-down biases it to logic low - but Microchip recommends hardwiring WP to GND or VCC for deterministic behavior.

Is AT24C32AW-10SI-2.7 compatible with the AT24C64A in terms of pinout and software interface?

Yes, AT24C32AW-10SI-2.7 shares identical pinout, I²C protocol, and command structure with AT24C64A - both use A0–A2 for addressing, SDA/SCL for communication, and WP for protection. However, memory size differs (32K vs. 64K), so software must correctly manage address boundaries and avoid crossing 4096-word limits when using AT24C32AW-10SI-2.7.

What is the write cycle time specification for AT24C32AW-10SI-2.7?

The AT24C32AW-10SI-2.7 has a maximum write cycle time of 5 ms for byte and page writes, as confirmed in the "AC Characteristics" table for devices marked with process letter 'A'. This value applies across its full 2.7–5.5V supply range and −40°C to +85°C temperature range - no derating required for industrial use cases.