Microchip Technology 24AA32AT-I/MS

Overview

24AA32AT-I/MS 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, 5 ms max page write time, and industrial temperature range (–40°C to +85°C). It features hardware write-protection via the WP pin, Schmitt-trigger inputs for noise immunity, and 32-byte page write buffer - deployed in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the 24AA32AT-I/MS datasheet, 24AA32AT-I/MS pinout, 24AA32AT-I/MS application, or 24AA32AT-I/MS equivalent, key selection criteria include low-voltage operation down to 1.7V, I²C bus compatibility at 100/400 kHz, hardware write-protect functionality, MSOP-8 package footprint constraints, and endurance of 1 million erase/write cycles with 200-year data retention.

Technical Context

The 24AA32AT-I/MS implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, and uses address pins A0–A2 to support up to eight devices on a shared bus. Its internal architecture includes a 32-byte page latch, HV generator for EEPROM programming, and address pointer logic enabling current-address, random, and sequential read modes.

Write operations are self-timed and internally managed: byte writes complete in ≤5 ms, and page writes (up to 32 bytes) initiate only after a Stop condition. Acknowledge polling is supported to detect write completion, and the WP pin samples at the Stop bit to enable/disable array writes - no effect if toggled mid-cycle.

Key Specifications

Pinout & Package

24AA32AT-I/MS is packaged in an 8-lead MSOP (Micro Small Outline Package) with 3 mm × 3 mm body, 0.65 mm pitch, and exposed pad optional for thermal relief or grounding. 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 24LC32AT-I/MS, the 24AA32AT-I/MS enables lower-voltage operation critical for battery-backed systems, while AT24C32D-MAHM-T extends temperature and speed capability - making 24AA32AT-I/MS optimal for cost-sensitive industrial and medical applications within its I-temp range.

Availability

24AA32AT-I/MS is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration backup, and medical sensor module ID & trim data applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 24AA32AT-I/MS 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA32A family was designed specifically for reliable, low-power, I²C-based nonvolatile data storage in space- and power-constrained embedded systems - emphasizing voltage flexibility, noise immunity, and long-term data integrity.

FAQ

What is the minimum operating voltage for the 24AA32AT-I/MS?

The 24AA32AT-I/MS operates down to 1.7V, enabling direct integration with 1.8V logic families and battery-powered systems where brown-out conditions occur. This is a key differentiator from the 24LC32A variant, which requires ≥2.5V. The 24AA32AT-I/MS maintains full I²C functionality-including 100 kHz clock support-at 1.7V.

Does the 24AA32AT-I/MS support page writes, and what is the maximum size?

Yes, the 24AA32AT-I/MS supports page writes of up to 32 bytes within a single physical page boundary (e.g., addresses 0x000–0x01F). Attempting to cross a 32-byte boundary causes wraparound within the current page. The internal page latch buffers all 32 bytes before initiating the self-timed 5 ms write cycle upon receipt of the Stop condition.

How does hardware write-protection work on the 24AA32AT-I/MS?

The WP pin on the 24AA32AT-I/MS must be tied to VCC to inhibit all write operations (byte, page, or erase), while read operations remain fully functional. The pin is sampled at the Stop bit of each write command - toggling WP during an active write has no effect. This provides tamper-resistant storage for critical calibration or security keys.

Is the 24AA32AT-I/MS pin-compatible with other packages in the 24XX32A family?

Yes - the 24AA32AT-I/MS in MSOP-8 shares identical pinout and function mapping with 24AA32A devices in SOIC-8, TSSOP-8, and PDIP-8 packages. However, the SOT-23-5 variant omits A0–A2 pins and uses a fixed address, so it is not pin-compatible. Always verify package-specific land patterns using Microchip drawing C04-111-MS Rev F.

What is the endurance rating and data retention specification for the 24AA32AT-I/MS?

The 24AA32AT-I/MS is rated for more than 1,000,000 erase/write cycles and guarantees data retention exceeding 200 years at +25°C. These values are characterized and ensured per Microchip's qualification standards - not merely typical - and apply across the full industrial temperature range (–40°C to +85°C) with derating per JEDEC JESD22-A117.