Microchip Technology 24AA32AFT-I/MNY

Overview

24AA32AFT-I/MNY from Microchip Technology Inc. is a 32 Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 400 μA max read current, 1 μA max standby current, and hardware write-protect for upper quarter array (C00h–FFFh). It serves in low-power embedded systems requiring nonvolatile parameter storage.

For engineers reviewing the 24AA32AFT-I/MNY datasheet, 24AA32AFT-I/MNY pinout, 24AA32AFT-I/MNY application, or 24AA32AFT-I/MNY equivalent, key selection criteria include VCC min (1.7V), I²C clock compatibility (100/400 kHz), page write buffer size (32 bytes), write-protect granularity (1/4 array), and TSSOP-8 package footprint.

Technical Context

The 24AA32AFT-I/MNY implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address counter supports current-address, random, and sequential reads, while the 32-byte page write buffer enables efficient bulk writes within physical page boundaries (0–31, 32–63, etc.).

Write protection is implemented via the WP pin, which-when tied to VCC-disables writes only to addresses C00h–FFFh (upper 8 Kbits); all other addresses remain writable. The device uses self-timed erase/write cycles with 5 ms max page write time and supports up to eight devices on one bus using A0–A2 address pins.

Key Specifications

Pinout & Package

24AA32AFT-I/MNY is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, and Pb-free/RoHS-compliant marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA32AFT-I/MNY, 24LC32AFT-I/MNY lacks 1.7V support but shares identical footprint and protocol; AT24C32D-MAHM-T provides broader write-protect flexibility at the cost of different register-level control, making it suitable for designs needing configurable protection zones.

Availability

24AA32AFT-I/MNY is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical sensors, and automotive body controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24AA32AFT-I/MNY 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 24AA32AF family was designed specifically for ultra-low-power, high-reliability nonvolatile storage in space- and power-constrained embedded systems, emphasizing robust I²C interoperability and extended data retention.

FAQ

What is the minimum operating voltage for the 24AA32AFT-I/MNY?

The 24AA32AFT-I/MNY operates down to 1.7V, enabling direct integration into 1.8V systems without level translation. This low-voltage capability is a defining feature distinguishing it from the 24LC32AF variant, which requires a minimum of 2.5V. The 24AA32AFT-I/MNY maintains full I²C functionality-including 400 kHz clock support-at 1.7V, making it ideal for battery-powered and energy-efficient applications where supply headroom is limited.

How does the write-protect (WP) pin function on the 24AA32AFT-I/MNY?

On the 24AA32AFT-I/MNY, the WP pin provides hardware-level protection for the upper quarter of the memory array (addresses C00h–FFFh). When WP is tied to VCC, write operations to that 8 Kbit region are inhibited, while reads remain fully functional. Writes to the lower 24 Kbit (000h–BFFh) are unaffected. The pin is sampled at the Stop bit of each write command, so toggling WP mid-operation has no effect. This selective protection helps safeguard critical firmware metadata or calibration data from accidental overwrites.

What package type is used for the 24AA32AFT-I/MNY?

The 24AA32AFT-I/MNY is supplied in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, designated by the "/MNY" suffix per Microchip's packaging nomenclature. This surface-mount package measures 3.0 mm × 4.4 mm × 1.1 mm and complies with JEDEC MO-153 standards. It is RoHS-compliant and features matte tin (Pb-free) terminations, making it suitable for automated reflow assembly in high-density PCB layouts.

Can multiple 24AA32AFT-I/MNY devices share the same I²C bus?

Yes, up to eight 24AA32AFT-I/MNY devices can operate on a single I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit slave addresses (1010xxx0). Each pin must be hardwired to either VCC or VSS to set its logic level. This enables scalable memory expansion-up to 256 Kbits total-without additional address decoding logic. Note that the SOT-23 variant lacks these pins and supports only a fixed address.

What is the maximum page write time for the 24AA32AFT-I/MNY?

The maximum page write time for the 24AA32AFT-I/MNY is 5 ms, covering both byte and full 32-byte page writes. This self-timed cycle is internally managed and does not require external delay insertion. To determine completion, the host MCU can use ACK polling: repeatedly send a Start + control byte (R/W = 0) until the device responds with an Acknowledge. This method maximizes bus utilization and avoids fixed-time delays, especially important in real-time or latency-sensitive embedded systems using the 24AA32AFT-I/MNY.