Microchip Technology 24AA32A/SN

Overview

24AA32A/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 (100 kHz below 2.5V), 1 µA standby current, and hardware write-protection via the WP pin. It supports page writes of up to 32 bytes and delivers >1 million erase/write cycles with >200 years data retention.

For engineers reviewing the 24AA32A/SN datasheet, 24AA32A/SN pinout, 24AA32A/SN application, or 24AA32A/SN equivalent, key selection criteria include low-voltage operation down to 1.7V, industrial temperature range (–40°C to +85°C), MSOP-8 package compatibility, and I²C bus noise immunity via Schmitt-trigger inputs and slope-controlled outputs.

Technical Context

The 24AA32A/SN implements a two-wire I²C interface with fixed 4-bit control code (1010b) and 3-bit chip address (A2–A0), enabling up to eight devices on one bus. Its internal architecture includes a 32-byte page latch, address pointer auto-increment, and on-chip HV generator for EEPROM programming.

Write operations are self-timed with maximum 5 ms cycle time; acknowledge polling is supported to detect completion. The device uses open-drain SDA/SCL with external pull-ups and samples the WP pin at the Stop bit to enable/disable array writes - no write occurs if WP = VCC during command execution.

Key Specifications

Pinout & Package

24AA32A/SN is packaged in an 8-lead MSOP (Micro Small Outline Package) with 3×3 mm body, 0.65 mm pitch, and exposed pad (optional VSS connection). Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA32A/SN, 24LC32A/SN excludes 1.7–2.49V operation but shares identical packaging and interface behavior, while AT24C32D-SSHM-T trades hardware write-protection for lower standby current and alternate vendor qualification - making 24AA32A/SN optimal for mixed-voltage industrial systems needing guaranteed hardware-level data integrity.

Availability

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

Supply support for 24AA32A/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 microcontrollers, 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, designed specifically for reliable, low-power, I²C-based nonvolatile storage in space-constrained industrial, automotive, and medical applications.

FAQ

What is the minimum operating voltage for the 24AA32A/SN?

The 24AA32A/SN operates down to 1.7V, enabling direct integration into 1.8V logic systems without level translation. Below 2.5V, its maximum I²C clock frequency is reduced to 100 kHz to maintain timing margins. This low-voltage capability is a key differentiator from the 24LC32A/SN, which requires ≥2.5V.

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

The WP (Write-Protect) pin on the 24AA32A/SN is sampled at the Stop bit of each write command. When tied to VCC, it inhibits all write operations (byte and page) while permitting unlimited reads. No write cycle initiates, and the device immediately accepts subsequent commands - providing hardware-enforced data integrity without firmware involvement.

What package type does the 24AA32A/SN use, and what are its key mechanical dimensions?

The 24AA32A/SN uses an 8-lead MSOP package (Micro Small Outline Package) with 3×3 mm body, 0.65 mm lead pitch, and 0.8–0.95 mm height. Pin 1 is identified by a beveled corner or dot. The exposed pad underneath may be connected to VSS for improved thermal performance or left floating per Microchip's recommendation.

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

Yes - up to eight 24AA32A/SN devices can operate on a single I²C bus using unique 3-bit chip addresses formed by A0, A1, and A2 pins. Each device must have a distinct combination of these inputs tied to VSS or VCC. The SOT-23 variant lacks address pins and supports only one device per bus.

What is the maximum page write size supported by the 24AA32A/SN?

The 24AA32A/SN supports a maximum page write size of 32 bytes. Writes exceeding this limit wrap around within the same physical page (addresses aligned to 32-byte boundaries), overwriting earlier data. To avoid unintended corruption, firmware must enforce page boundary alignment before issuing page write commands.