Microchip Technology 24AA32A-I/SN

Overview

24AA32A-I/SN from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit, operating from 1.7V to 5.5V with 400 kHz max clock frequency, 1 µA standby current, and industrial temperature range (–40°C to +85°C). It supports page writes up to 32 bytes, hardware write-protection via WP pin, and delivers >1 million erase/write cycles with >200 years data retention - used for configuration storage in embedded controllers and sensor modules.

For engineers reviewing the 24AA32A-I/SN datasheet, 24AA32A-I/SN pinout, 24AA32A-I/SN application, or 24AA32A-I/SN equivalent, key selection considerations include low-voltage operation down to 1.7V, Schmitt-trigger noise immunity on SDA/SCL, self-timed write cycle (≤5 ms), and compatibility with multi-device I²C buses using A0–A2 address inputs.

Technical Context

The 24AA32A-I/SN implements a two-wire I²C interface with open-drain SDA/SCL requiring external pull-ups, and uses internal address pointer logic to support current-address, random, and sequential read modes. Its EEPROM array is partitioned into 32-byte pages, with page-write buffering enabling burst writes within a single physical page boundary.

Write protection is controlled by the WP pin sampled at the Stop bit; tying WP to VCC disables all writes while preserving reads. The device features Schmitt-trigger inputs (≥50 mV hysteresis) and slope-controlled outputs to suppress ground bounce and meet I²C timing requirements across 1.7V–5.5V supply range.

Key Specifications

Pinout & Package

24AA32A-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150-mil width (SN suffix per Microchip's package coding), featuring gull-wing leads and standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA32A-I/SN, the 24LC32A-I/SN offers identical functionality at higher minimum voltage, while AT24C32D-SSHM-T provides comparable low-voltage performance but mandates I²C address rework and lacks hardware address flexibility in compact packages.

Availability

24AA32A-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for 24AA32A-I/SN 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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA32A belongs to Microchip's serial EEPROM product line, engineered for reliable nonvolatile data storage in resource-constrained embedded systems where low power, small footprint, and I²C simplicity are critical.

FAQ

What is the maximum I²C clock frequency supported by the 24AA32A-I/SN?

The 24AA32A-I/SN supports up to 400 kHz when VCC is 2.5V or higher. At supply voltages between 1.7V and 2.5V, the maximum clock frequency is reduced to 100 kHz to ensure timing compliance. This dual-speed capability allows the 24AA32A-I/SN to operate reliably across wide voltage ranges without external clock scaling logic.

How does the WP pin function on the 24AA32A-I/SN?

The WP (Write-Protect) pin on the 24AA32A-I/SN is sampled at the Stop bit of each write command. When tied to VCC, it disables all write operations (byte and page) while permitting unlimited reads. When tied to VSS, writes are enabled. This hardware-level protection prevents accidental overwrites of critical configuration data in the 24AA32A-I/SN during system operation.

Can multiple 24AA32A-I/SN devices share the same I²C bus?

Yes - the 24AA32A-I/SN supports up to eight devices on a single I²C bus using its three hardware address inputs (A0, A1, A2). Each device is assigned a unique 7-bit client address (0xA0–0xA7) based on the logic levels applied to these pins, enabling consolidated memory expansion up to 256 Kbits without additional address decoding circuitry.

What is the page write capability of the 24AA32A-I/SN?

The 24AA32A-I/SN features a 32-byte page write buffer, allowing up to 32 bytes to be written in a single I²C transaction. Writes must remain within a single 32-byte physical page boundary (e.g., addresses 0x000–0x01F); crossing boundaries causes wraparound. This capability reduces bus traffic and improves efficiency compared to individual byte writes.

Is the 24AA32A-I/SN suitable for automotive applications?

The base 24AA32A-I/SN is rated for industrial temperature (–40°C to +85°C) and is widely deployed in automotive body electronics. For AEC-Q100 qualified versions, Microchip offers the 24AA32AT-I/SN (with 'T' suffix), which undergoes additional stress testing. Always verify qualification status via Microchip's official part numbering guide before automotive deployment.