Microchip Technology 24LC32AT-E/MNY

Overview

24LC32AT-E/MNY from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 2.5V to 5.5V with 400 kHz max clock frequency and industrial-extended temperature range (–40°C to +125°C). It features hardware write-protection via the WP pin, 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity-used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 24LC32AT-E/MNY datasheet, 24LC32AT-E/MNY pinout, 24LC32AT-E/MNY application, or 24LC32AT-E/MNY equivalent, key selection criteria include VCC compatibility (2.5–5.5V), extended-temp operation, I²C bus timing compliance at 400 kHz, and MNY package-specific footprint and thermal performance in space-constrained industrial modules.

Technical Context

The 24LC32AT-E/MNY implements a two-wire I²C interface with open-drain SDA/SCL pins, internal address pointer for sequential reads, and self-timed erase/write cycles. Its architecture supports up to eight devices on one bus using A0–A2 address inputs, with contiguous 256-Kbit expansion possible across multiple units.

It uses CMOS EEPROM array with on-chip HV generator, page latches, and X/Y decoders. Write protection is controlled solely by the WP pin state at Stop bit sampling, and acknowledge polling enables precise write-cycle completion detection without fixed delay timing.

Key Specifications

Pinout & Package

24LC32AT-E/MNY is packaged 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 for thermal enhancement. 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 24LC32A-I/MNY, the 24LC32AT-E/MNY adds extended temperature support without trade-offs in speed, endurance, or pin compatibility-making it the direct upgrade for harsh-environment designs. Versus AT24C32D-MAHM-T, it trades voltage flexibility for automotive qualification and MSOP footprint continuity.

Availability

24LC32AT-E/MNY is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC32AT-E/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, FPGA, and memory solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.

The 24LC32A family delivers cost-effective, high-reliability serial EEPROMs optimized for configuration storage and parameter retention in space- and power-constrained embedded systems-especially where extended temperature, AEC-Q100 compliance, or I²C bus scalability matter.

FAQ

What is the maximum I²C clock frequency supported by the 24LC32AT-E/MNY?

The 24LC32AT-E/MNY supports up to 400 kHz I²C clock frequency across its full VCC range (2.5V–5.5V) and extended temperature range (–40°C to +125°C). This is confirmed in the Device Selection Table and AC Characteristics section of DS20001713P, where FCLK is specified as 400 kHz for VCC ≥ 2.5V. No derating is required at high temperature.

Does the 24LC32AT-E/MNY support write-protection at the hardware level?

Yes, the 24LC32AT-E/MNY includes a dedicated Write-Protect (WP) pin that, when tied to VCC, disables all write operations-including byte, page, and erase-while allowing unrestricted reads. The WP state is sampled at the Stop bit of each write command, ensuring deterministic protection without software dependency.

What package type does the 24LC32AT-E/MNY use, and what are its key mechanical dimensions?

The 24LC32AT-E/MNY uses an 8-lead MSOP (Micro Small Outline Package) with 3×3 mm body, 0.65 mm lead pitch, and 0.80–0.95 mm height. Per Microchip drawing C04-111-MS Rev F, it features gull-wing leads, a beveled corner for Pin 1 identification, and an optional exposed pad for thermal relief.

How many devices can share the same I²C bus with the 24LC32AT-E/MNY?

Up to eight 24LC32AT-E/MNY devices can operate on a single I²C bus using the A0, A1, and A2 address inputs to configure unique 3-bit chip select codes. Each combination (e.g., A2A1A0 = 000 to 111) yields a distinct 7-bit client address (1010A2A1A0), enabling scalable memory expansion to 256 Kbits.

Is the 24LC32AT-E/MNY qualified for automotive applications?

Yes, the 24LC32AT-E/MNY is AEC-Q100 qualified for Grade 1 (–40°C to +125°C), with testing covering accelerated environmental stress, thermal cycling, and failure mechanisms relevant to automotive electronics. This qualification is explicitly stated in the Features section of DS20001713P.