Microchip Technology 24LC32AFT-I/MS

Overview

24LC32AFT-I/MS from Microchip Technology Inc. is a 32 Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 2.5V 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 1/4 array (C00h–FFFh). It serves in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the 24LC32AFT-I/MS datasheet, 24LC32AFT-I/MS pinout, 24LC32AFT-I/MS application, or 24LC32AFT-I/MS equivalent, key selection criteria include VCC min (2.5V), page write buffer size (32 bytes), WP-enabled quarter-array protection, I²C clock compatibility (100/400 kHz), and MSOP-8 package footprint constraints.

Technical Context

The 24LC32AFT-I/MS implements a two-wire I²C interface with Schmitt-trigger inputs on SDA/SCL for noise immunity and slope-controlled outputs to suppress ground bounce. Its internal address counter supports current-address, random, and sequential read modes, while the 32-byte page write buffer enables burst writes within physical page boundaries (0–31, 32–63, etc.).

Write protection is enforced via the WP pin: tied high, it disables writes to addresses C00h–FFFh; tied low, full array access is permitted. Acknowledge polling is supported to detect end-of-write-cycle completion without fixed timing delays, improving bus efficiency in multi-device systems.

Key Specifications

Pinout & Package

24LC32AFT-I/MS is housed in an 8-pin MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts while maintaining hand-solderability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA32AT-I/MS and AT24C32D-MAHM-T, the 24LC32AFT-I/MS delivers optimal trade-off for 2.5V+ industrial designs requiring hardware-enforced write protection of critical memory regions without sacrificing package compatibility or endurance.

Availability

24LC32AFT-I/MS is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 24LC32AFT-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC32AFT-I/MS belongs to Microchip's 24XX32AF family of I²C serial EEPROMs, engineered for reliable, low-power nonvolatile storage in space- and energy-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC32AFT-I/MS?

The 24LC32AFT-I/MS requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Unlike the 24AA32AF variant, it is not specified for 1.7V operation. Operating below 2.5V may result in undefined behavior, failed writes, or incomplete acknowledge responses during I²C transactions. Always verify VCC stability under load using the 24LC32AFT-I/MS datasheet's DC characteristics table.

How does the hardware write-protect (WP) pin function on the 24LC32AFT-I/MS?

On the 24LC32AFT-I/MS, the WP pin provides hardware-level protection for the upper 1/4 of memory (addresses C00h–FFFh). When WP is tied to VCC, writes to that region are blocked while reads remain fully functional. When WP is tied to VSS, full array write access is enabled. The pin state is sampled at the Stop bit of each write command - toggling WP mid-cycle has no effect. This mechanism prevents accidental overwrites of critical firmware or calibration data.

What is the maximum I²C clock frequency supported by the 24LC32AFT-I/MS?

The 24LC32AFT-I/MS supports up to 400 kHz I²C clock frequency when VCC is 2.5V or higher - matching I²C fast-mode specification. At this rate, the device sustains full timing compliance for setup, hold, rise, and fall times per Table 1-2 of the datasheet. It does not support 1 MHz high-speed mode. For systems with marginal bus capacitance, derating to 100 kHz may improve reliability, though not required by specification.

Can the 24LC32AFT-I/MS be used in place of the 24AA32AFT-I/MS?

No - the 24LC32AFT-I/MS and 24AA32AFT-I/MS are not direct substitutes due to differing VCC minima: 24LC32AFT-I/MS requires ≥2.5V, while 24AA32AFT-I/MS operates down to 1.7V. Swapping them in a 1.8V system will cause functional failure. Both share identical pinout, package, memory size, and feature set otherwise. Selection must be based on actual system supply voltage and temperature requirements documented in their respective datasheets.

What package type does the 24LC32AFT-I/MS use, and what are its key mechanical dimensions?

The 24LC32AFT-I/MS uses an 8-pin MSOP (Mini Small Outline Package) with 3.0 mm × 3.0 mm body size, 0.65 mm lead pitch, and 1.0 mm maximum height. Pin 1 is marked by a beveled corner or dot. The package complies with JEDEC MO-187AB and is RoHS-compliant with matte tin (Sn) plating. Its compact footprint supports high-density PCB layouts while maintaining adequate thermal dissipation for continuous I²C operation.