Microchip Technology AT24C32AN-10SI-2.7-T

Overview

AT24C32AN-10SI-2.7-T from Microchip Technology (formerly Atmel) is a 32K-bit I²C-compatible serial EEPROM organized as 4096 × 8 bits, operating from 2.7V to 5.5V, featuring hardware write protection via the WP pin, 32-byte page write capability, and 1 million write cycles endurance. It is used in industrial control systems for storing calibration data, configuration settings, and firmware parameters.

For engineers reviewing the AT24C32AN-10SI-2.7-T datasheet, AT24C32AN-10SI-2.7-T pinout, AT24C32AN-10SI-2.7-T application, or AT24C32AN-10SI-2.7-T equivalent, key selection considerations include its 2.7V–5.5V supply range, 400 kHz max clock rate at 2.5V+, SOIC-8 package compatibility, and hardware-based write protection functionality.

Technical Context

The AT24C32AN-10SI-2.7-T implements a standard two-wire I²C interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. It supports cascading up to eight devices on a single bus using A0–A2 address pins.

It uses internal address auto-increment during sequential reads and page-boundary-aware addressing for 32-byte page writes. Write operations are self-timed with a maximum 5 ms internal cycle, and acknowledge polling enables host synchronization without fixed delays.

Key Specifications

Pinout & Package

AT24C32AN-10SI-2.7-T is housed in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide, with gull-wing leads and standard 1.27 mm pitch. The package meets RoHS, lead-free, and halogen-free requirements per ordering code suffix -T.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C32-WMN6TP and BR24G32FJ-3GE2, the AT24C32AN-10SI-2.7-T provides the widest voltage range (2.7–5.5V) among the three, maintains identical pinout and command set for drop-in replacement in legacy designs, and delivers best-in-class standby current (6 µA) at 5V - critical for always-on industrial nodes.

Availability

AT24C32AN-10SI-2.7-T is available at Aetrix Electronics and suitable for industrial automation, smart metering, and motor control applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for AT24C32AN-10SI-2.7-T 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 components, and nonvolatile memory solutions, with a focus on embedded control and connectivity.

The AT24C32AN-10SI-2.7-T belongs to Microchip's AT24Cxx serial EEPROM product line, designed specifically for reliable, low-power, I²C-based data storage in industrial, automotive, and consumer systems where board space and power efficiency are constrained.

FAQ

What is the maximum I²C clock frequency supported by the AT24C32AN-10SI-2.7-T?

The AT24C32AN-10SI-2.7-T supports up to 400 kHz at VCC ≥ 2.5V. At 2.7V operation, the maximum clock rate remains 400 kHz per the AC Characteristics table. It does not support 1 MHz operation - that capability is found only in newer families like the AT24CM01 or BR24Gxx series. Timing compliance must be verified using tLOW, tHIGH, and tBUF values from the official Microchip datasheet DS20005870B.

Does the AT24C32AN-10SI-2.7-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C32AN-10SI-2.7-T 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 speed; 4.7 kΩ is commonly used for 400 kHz operation with ≤400 pF total bus load. Failure to install pull-ups will prevent proper bus communication.

How does the write protect (WP) pin function on the AT24C32AN-10SI-2.7-T?

When the WP pin of the AT24C32AN-10SI-2.7-T is driven high to VCC, all write operations (byte and page) are inhibited - only read commands execute. When WP is grounded, full read/write access is enabled. If left floating, the pin is internally pulled down, defaulting to write-enabled mode. This hardware lock operates independently of software commands and persists across power cycles.

Can multiple AT24C32AN-10SI-2.7-T devices share the same I²C bus?

Yes, up to eight AT24C32AN-10SI-2.7-T devices can share one I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit device addresses (0x50–0x57). Each device must have a distinct combination of hardwired or grounded address pins; floating pins default to logic low due to internal biasing, so explicit termination is recommended for deterministic addressing.

What is the typical write cycle time for the AT24C32AN-10SI-2.7-T, and how should hosts manage it?

The AT24C32AN-10SI-2.7-T has a maximum write cycle time of 5 ms. Hosts must either wait this fixed duration or use acknowledge polling: repeatedly sending a START + device address until the EEPROM responds with ACK, indicating write completion. Polling avoids worst-case delays and is preferred in time-sensitive applications. The tWR parameter is characterized, not 100% tested per unit.