Microchip Technology AT24C32W-10SI-2.7

Overview

AT24C32W-10SI-2.7 from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) I²C-compatible serial EEPROM optimized for low-voltage embedded systems. It operates from 2.7V to 5.5V, supports 100 kHz clock rate at 2.7V, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention - used in industrial sensor calibration storage and firmware parameter backup.

For engineers reviewing the AT24C32W-10SI-2.7 datasheet, AT24C32W-10SI-2.7 pinout, AT24C32W-10SI-2.7 application, or AT24C32W-10SI-2.7 equivalent, key selection criteria include VCC range compatibility (2.7–5.5V), page-write capability (32-byte), Schmitt-trigger noise immunity on SDA/SCL, and SOIC-8 package footprint for space-constrained PCBs.

Technical Context

The AT24C32W-10SI-2.7 implements a standard two-wire I²C interface with open-drain SDA and edge-triggered SCL, supporting up to eight devices on one bus via A0–A2 address inputs. Its internal architecture organizes memory as 256 pages of 32 bytes each, enabling partial-page writes without erasing adjacent data.

It integrates a low-power standby mode (ISB = 0.5 µA at 2.7V), Schmitt-trigger inputs with 100 ns noise suppression, and a hardware write-protect function that disables writes to the upper quadrant (8K bits) when WP = VCC. The device uses internal address auto-increment during sequential reads and supports acknowledge polling for write-cycle completion detection.

Key Specifications

Pinout & Package

AT24C32W-10SI-2.7 is housed in an 8-pin JEDEC SOIC (8S1) package per ordering code suffix "SI", with 1.27 mm pitch, gull-wing leads, and 3.9 mm × 4.9 mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32W-10SI-2.7, M24C32-WMN6TP offers faster throughput in 5V designs but weaker noise resilience, while BR24G32FJ-3GE2 adds ECC at the cost of software-managed protection - making AT24C32W-10SI-2.7 optimal for cost-sensitive, noise-immune industrial I²C nodes requiring hardware-level write lock.

Availability

AT24C32W-10SI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and PLC configuration backup requiring stable component supply across extended product lifecycles.

Supply support for AT24C32W-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on industrial, automotive, and communications markets.

The AT24C32 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C32W-10SI-2.7 at 2.7V?

The AT24C32W-10SI-2.7 supports a maximum I²C clock frequency of 100 kHz when operating at 2.7V. This is explicitly specified in the AC Characteristics table under "2.7-, 2.5-volt" conditions. At 5.0V, the device supports up to 400 kHz, but the 2.7V variant is rated only to 100 kHz to ensure timing margin and noise immunity in low-voltage industrial applications. AT24C32W-10SI-2.7 must be configured accordingly in host firmware to avoid communication failures.

Does AT24C32W-10SI-2.7 support partial page writes?

Yes, AT24C32W-10SI-2.7 supports partial page writes - meaning fewer than 32 bytes can be written in a single page-write transaction. The device internally increments the lower 5 bits of the address after each byte, allowing writes to begin and end anywhere within the 32-byte page boundary. This capability simplifies firmware implementation for variable-length parameter updates without requiring full-page erasure. AT24C32W-10SI-2.7 retains all unwritten bytes in the same page unchanged.

How does the WP pin function on AT24C32W-10SI-2.7?

On AT24C32W-10SI-2.7, the WP (Write Protect) pin is active-high: when tied to VCC, it inhibits writes to the upper quadrant (8K bits, addresses 0x2000–0x3FFF); when tied to GND, full-memory writes are enabled. If left unconnected, an internal pull-down defaults WP to GND, enabling full write access. This hardware-level protection prevents accidental overwrites of critical calibration or security data without requiring software intervention. AT24C32W-10SI-2.7 relies on this pin for robust field reliability.

What package type is used for AT24C32W-10SI-2.7?

AT24C32W-10SI-2.7 uses an 8-pin JEDEC SOIC (8S1) package: 3.9 mm × 4.9 mm body, 1.27 mm lead pitch, gull-wing leads, and RoHS-compliant matte tin plating. This package is fully compatible with standard surface-mount reflow profiles (J-STD-020) and automated optical inspection. The "SI" suffix in the part number explicitly denotes the JEDEC SOIC variant, distinguishing it from PDIP (PI) or EIAJ SOIC (N) versions. AT24C32W-10SI-2.7 is optimized for high-density PCB layouts in industrial control modules.

Is AT24C32W-10SI-2.7 suitable for automotive applications?

AT24C32W-10SI-2.7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. While it may function in some automotive cabin environments, Microchip does not certify this specific variant for under-hood or safety-critical automotive use. For automotive applications, designers should select the automotive-grade AT24C32D series (e.g., AT24C32D-SSHM-T) which undergoes extended qualification testing. AT24C32W-10SI-2.7 is intended for industrial, medical, and commercial systems where AEC-Q100 is not mandated.