Microchip Technology 24AA32AT-I/SM

Overview

24AA32AT-I/SM from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 1.7V to 5.5V with 1 µA standby current and 400 kHz max clock frequency. It features hardware write-protection (WP pin), 32-byte page write buffer, and industrial temperature range (–40°C to +85°C) in an 8-lead MSOP package. Used for nonvolatile parameter storage in embedded controllers, power supplies, and sensor calibration modules.

For engineers reviewing the 24AA32AT-I/SM datasheet, 24AA32AT-I/SM pinout, 24AA32AT-I/SM application, or 24AA32AT-I/SM equivalent, key selection criteria include low-voltage operation down to 1.7V, I²C bus compatibility up to 400 kHz, hardware write-protect functionality, 32-byte page write capability, and industrial-grade reliability with >1 million erase/write cycles and >200 years data retention.

Technical Context

The 24AA32AT-I/SM implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer supports current-address, random, and sequential read modes, while the 32-byte page buffer enables efficient bulk writes without host intervention between bytes.

Write protection is enforced via the dedicated WP pin, sampled at the Stop bit of each write command; tying WP to VCC disables all writes while preserving read access. Device addressing uses a fixed 4-bit control code (1010b) plus three chip-select bits (A0–A2), allowing up to eight devices on one bus - though the MSOP package (SM suffix) includes all three address pins.

Key Specifications

Pinout & Package

24AA32AT-I/SM is housed in an 8-lead MSOP (Micro Small Outline Package) with 3×3 mm body, 0.65 mm pitch, and exposed pad optionally connected to VSS. 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 24AA32AT-I/SM, the 24LC32AT-I/SM excludes sub-2.5V operation but shares identical packaging and bus behavior, while the AT24C32D-SSHM-T offers equivalent voltage range and endurance but differs in retention guarantee and manufacturer-specific timing tolerances.

Availability

24AA32AT-I/SM is available at Aetrix Electronics and suitable for industrial sensor calibration, power supply configuration, and embedded controller settings requiring stable component supply, long-term data retention, and low-voltage I²C compatibility.

Supply support for 24AA32AT-I/SM 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 delivers cost-effective, low-power serial EEPROMs optimized for industrial and automotive applications demanding high reliability, wide voltage operation, and I²C bus simplicity.

FAQ

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

The 24AA32AT-I/SM operates down to 1.7V, enabling direct integration with 1.8V logic families and battery-powered systems where supply voltage may dip below 2.5V. This distinguishes it from the 24LC32A variant, which requires ≥2.5V. The 24AA32AT-I/SM maintains full I²C functionality-including 400 kHz operation-at 1.7V, though clock timing parameters adjust per datasheet Table 1-2.

Does the 24AA32AT-I/SM support page write operations, and what is the buffer size?

Yes, the 24AA32AT-I/SM supports page write operations with a 32-byte buffer. This allows up to 32 bytes to be loaded into the internal latch before initiating the self-timed write cycle, reducing I²C bus occupancy versus byte-by-byte writes. Page boundaries align to 32-byte offsets (0x000–0x01F, 0x020–0x03F, etc.), and crossing a boundary causes wraparound within the current page.

How does the Write-Protect (WP) pin function on the 24AA32AT-I/SM?

The WP pin on the 24AA32AT-I/SM is an active-high hardware lock: when tied to VCC, all write operations (byte and page) are inhibited while read access remains fully functional. The pin is sampled at the Stop bit of each write command, so toggling WP mid-operation has no effect. This provides deterministic, non-software-dependent protection against accidental or malicious memory corruption.

What package type is used for the 24AA32AT-I/SM, and what are its key mechanical dimensions?

The 24AA32AT-I/SM uses an 8-lead MSOP (Micro Small Outline Package) with 3×3 mm body, 0.65 mm lead pitch, and nominal thickness of 0.85 mm. It features gull-wing leads and a mold compound compliant with RoHS and JEDEC standards. The package marking "I/SM" confirms Industrial temperature grade and MSOP form factor per Microchip's part numbering convention.

Can multiple 24AA32AT-I/SM devices share the same I²C bus, and how is addressing managed?

Yes, up to eight 24AA32AT-I/SM devices can share one I²C bus using hardware-configurable addressing via A0, A1, and A2 pins. Each pin accepts VSS or VCC to set a 3-bit chip address appended to the base 1010b control code, yielding addresses 0xA0–0xAE (even) for writes and 0xA1–0xAF (odd) for reads. The MSOP package includes all three address pins, unlike SOT-23 variants.