Microchip Technology 24AA32A-I/P

Overview

24AA32A-I/P from Microchip Technology is a 32-Kbit I²C 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), Schmitt-trigger inputs for noise immunity, and 32-byte page write buffer - deployed in industrial sensor calibration, embedded configuration storage, and power-management parameter retention.

For engineers reviewing the 24AA32A-I/P datasheet, 24AA32A-I/P pinout, 24AA32A-I/P application, or 24AA32A-I/P equivalent, key selection considerations include its 1.7V low-voltage operation, I²C bus compatibility up to eight devices per bus, industrial temperature range (–40°C to +85°C), and 1 million erase/write cycles with >200-year data retention.

Technical Context

The 24AA32A-I/P implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, and uses internal address pointer logic for sequential, random, and current-address read modes. Its page-write architecture buffers up to 32 bytes before initiating self-timed internal erase/write cycles.

Device addressing relies on three hardware-configurable chip-select pins (A0–A2) enabling up to eight devices on one bus; the SOT-23 variant omits these pins, but the 24AA32A-I/P uses PDIP packaging with full A0–A2 support. Write protection is controlled solely by the WP pin state at Stop bit sampling.

Key Specifications

Pinout & Package

24AA32A-I/P is supplied in an 8-lead plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin 1 is marked with a notch or dot; leads are tin-plated, RoHS-compliant, and rated for wave/solder-reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC32A-I/P and AT24C32D-SSHM-T, the 24AA32A-I/P uniquely delivers 1.7V operation with Schmitt-trigger noise immunity and 1 µA standby - making it the only choice for battery-powered industrial sensors requiring guaranteed functionality across full voltage and temperature ranges.

Availability

24AA32A-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and power-management parameter retention requiring stable component supply across extended product lifecycles.

Supply support for 24AA32A-I/P 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-I/P belongs to Microchip's serial EEPROM product line, engineered specifically for reliable, low-voltage nonvolatile storage in industrial, automotive, and medical applications demanding long-term data integrity and robust I²C interoperability.

FAQ

What is the minimum operating voltage for the 24AA32A-I/P?

The 24AA32A-I/P operates down to 1.7V, enabling direct interface with 1.8V logic families and low-power microcontrollers without level translation. This specification is validated across the full industrial temperature range (–40°C to +85°C) and distinguishes it from the 24LC32A-I/P, which requires ≥2.5V. The 24AA32A-I/P maintains full I²C timing compliance and 400 kHz clock capability at 2.5V and above.

How does the write-protect (WP) pin function on the 24AA32A-I/P?

The WP pin on the 24AA32A-I/P is sampled only at the Stop condition of each write command. When tied to VCC, it inhibits all write operations (byte and page) while permitting unrestricted reads. Toggling WP during an active write cycle has no effect - protection is latched at Stop. This behavior ensures deterministic, hardware-enforced data integrity independent of firmware state, making the 24AA32A-I/P suitable for safety-critical configuration storage.

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

Yes - the 24AA32A-I/P supports up to eight devices on a single I²C bus using hardware-configurable A0, A1, and A2 pins. Each combination sets a unique 3-bit chip address (0x50–0x57), allowing contiguous 256 Kbit expansion. The 24AA32A-I/P's PDIP package includes all three address pins, unlike SOT-23 variants, ensuring full multi-device scalability in space-constrained industrial control boards.

What is the maximum page write size supported by the 24AA32A-I/P?

The 24AA32A-I/P supports a 32-byte page write buffer, allowing up to 32 bytes to be loaded into the on-chip latch before initiating the internal self-timed write cycle. Page writes must remain within physical page boundaries (addresses 0x000–0x01F, 0x020–0x03F, etc.); crossing boundaries causes wraparound within the current page. This architecture reduces bus occupancy versus byte writes and is optimized for storing structured configuration blocks in the 24AA32A-I/P.

Is the 24AA32A-I/P qualified for automotive applications?

The 24AA32A-I/P is not AEC-Q100 qualified - that qualification applies only to the 24AA32A-E/P (Extended temperature) and 24AA32A-EM/P (automotive-grade) variants. The "I" suffix denotes Industrial temperature grade (–40°C to +85°C), suitable for industrial automation, medical equipment, and commercial infrastructure, but not for under-hood automotive use. For automotive designs, engineers must specify the -E or -EM suffix versions of the 24AA32A-I/P family.