Microchip Technology 24LC32AT-I/SNG

Overview

24LC32AT-I/SNG from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory with hardware write-protection, 32-byte page buffer, and operation from 2.5V to 5.5V. It supports 400 kHz clock frequency at V_CC ≥ 2.5V, features Schmitt-trigger inputs for noise immunity, and delivers ≤1 µA standby current. It is used in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the 24LC32AT-I/SNG datasheet, 24LC32AT-I/SNG pinout, 24LC32AT-I/SNG application, or 24LC32AT-I/SNG equivalent, key selection criteria include I²C bus compatibility, industrial temperature range (-40°C to +85°C), SOIC-8 package footprint, and hardware WP pin control - all confirmed for this exact variant.

Technical Context

The 24LC32AT-I/SNG 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 a self-timed 5 ms erase/write cycle.

Write protection is controlled solely by the WP pin state (V_SS = enabled, V_CC = inhibited), sampled at the Stop bit of each write command. Device addressing uses a fixed 4-bit control code (1010) plus three chip-select bits (A2–A0), enabling up to eight devices on one bus - confirmed for SOIC-8 packaging per Device Selection Table.

Key Specifications

Pinout & Package

24LC32AT-I/SNG is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, 3.90 mm body width, and gull-wing leads. The package is RoHS-compliant and rated for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA32AT-I/SNG and AT24C32D-SSHM-T, the 24LC32AT-I/SNG provides deterministic hardware write-disable independent of firmware state, operates reliably across its specified 2.5–5.5V window without marginality concerns, and maintains full pin and functional compatibility within the Microchip 24XX32A family - making it optimal for industrial control designs prioritizing robustness over ultra-low-voltage operation or raw speed.

Availability

24LC32AT-I/SNG is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration retention, medical device parameter archiving, and automotive body control module settings requiring stable component supply across extended production lifecycles.

Supply support for 24LC32AT-I/SNG 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 manufacturing and support infrastructure.

The 24LC32AT-I/SNG belongs to Microchip's 24XX32A family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in industrial, automotive, and medical systems where write endurance, data retention, and hardware-level security are critical.

FAQ

What is the maximum I²C clock frequency supported by the 24LC32AT-I/SNG?

The 24LC32AT-I/SNG supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher. At voltages below 2.5V, the maximum clock rate drops to 100 kHz. This dual-speed capability is explicitly defined in the Device Selection Table and AC Characteristics section of the official datasheet DS20001713P, confirming that the 24LC32AT-I/SNG does not support 1 MHz operation like some competing EEPROMs.

Does the 24LC32AT-I/SNG have a hardware write-protect feature?

Yes, the 24LC32AT-I/SNG includes a dedicated Write-Protect (WP) pin that, when tied to V_CC, inhibits all write operations while allowing unrestricted reads. This hardware-level lock is sampled at the Stop bit of each write command and cannot be overridden by software - a verified feature documented in Section 2.4 and Figure 6-1 of DS20001713P, ensuring fail-safe protection of critical configuration data.

What package type is used for the 24LC32AT-I/SNG?

The 24LC32AT-I/SNG is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 3.90 mm body width and 1.27 mm lead pitch, as confirmed by the Device Selection Table and Package Marking Information on page 13 of DS20001713P. The "SNG" suffix in the part number explicitly denotes this SOIC-8 variant, distinguishing it from MSOP, TSSOP, or DFN versions of the same base device.

How many devices can share the same I²C bus with the 24LC32AT-I/SNG?

Up to eight 24LC32AT-I/SNG devices can operate on a single I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit chip addresses. Each combination of these pins selects one of eight possible addresses (1010xxx in binary), as detailed in Section 5.0 and Figure 5-1 of DS20001713P - enabling scalable memory expansion without additional bus controllers.

What is the guaranteed data retention period for the 24LC32AT-I/SNG?

The 24LC32AT-I/SNG guarantees data retention exceeding 200 years at +25°C, as stated in the Features list and Electrical Characteristics table of DS20001713P. This specification applies to the entire memory array under standard operating conditions and is validated through accelerated life testing - ensuring long-term integrity of calibration constants and configuration parameters in deployed systems.