Microchip Technology 24LC512-E/ST

Overview

24LC512-E/ST from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit, operating from 2.5V to 5.5V with 400 kHz max clock frequency, 1 µA standby current, and industrial/extended temperature range (–40°C to +125°C). It features hardware write-protection, 128-byte page write buffer, and Schmitt-trigger inputs for noise immunity in embedded control and data logging systems.

For engineers reviewing the 24LC512-E/ST datasheet, 24LC512-E/ST pinout, 24LC512-E/ST application, or 24LC512-E/ST equivalent, key selection criteria include VCC min/max, I²C clock compatibility at extended temperature, WP pin behavior, page write timing, and package-specific pin mapping for SOIC-8 (ST) footprint integration.

Technical Context

The 24LC512-E/ST implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, supports up to eight devices on one bus via A0–A2 address inputs, and uses internal address pointer logic for sequential read/wraparound addressing across the full 64K-word space. Its EEPROM array employs self-timed erase/write cycles with no external timing components required.

Write protection is controlled solely by the WP pin state at Stop bit sampling; tying WP to VCC disables all writes while preserving read functionality. The device incorporates Schmitt-trigger inputs and output slope control to suppress ground bounce and improve noise immunity in electrically noisy environments such as automotive body control modules and industrial PLCs.

Key Specifications

Pinout & Package

The 24LC512-E/ST is supplied in an 8-lead SOIC package (ST suffix), with standard 1.27 mm pitch, 5.0 mm × 4.0 mm body, and JEDEC MS-012AC compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512-E/ST, the 24AA512-I/ST offers wider voltage range but sacrifices extended temperature capability, while the AT24C512BN-SH-T provides functional equivalence at lower qualification level - making 24LC512-E/ST the only option meeting AEC-Q100 and +125°C requirements in its class.

Availability

24LC512-E/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical infusion pump logging, and smart energy meter firmware patching requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24LC512-E/ST 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24LC512-E/ST belongs to Microchip's 24XX512 family of I²C EEPROMs designed specifically for reliable, low-power nonvolatile data storage in automotive, industrial, and medical systems demanding extended temperature operation and AEC-Q100 compliance.

FAQ

What is the minimum VCC voltage required for reliable operation of the 24LC512-E/ST?

The 24LC512-E/ST requires a minimum VCC of 2.5V for guaranteed operation across its full –40°C to +125°C temperature range. Below 2.5V, the device is not characterized or specified; attempting operation at 1.7V may result in undefined behavior or failure to respond on the I²C bus. This distinguishes it from the 24AA512 variant, which supports 1.7V operation but only up to +85°C.

Does the 24LC512-E/ST support 1 MHz I²C clock frequency?

No, the 24LC512-E/ST does not support 1 MHz I²C clock frequency. Its maximum clock frequency is 400 kHz across the full extended temperature range (–40°C to +125°C). Only the 24FC512 variant in the same family supports 1 MHz operation, and even then only at VCC ≥ 2.5V and within the industrial temperature range.

How does hardware write-protection work on the 24LC512-E/ST?

Hardware write-protection on the 24LC512-E/ST is controlled exclusively by the WP pin: when tied to VCC, all write operations (byte, page, and erase) are inhibited, though read operations remain fully functional. The WP state is sampled only at the Stop bit of each write command, so toggling WP during a write cycle has no effect - ensuring deterministic protection during power transitions.

What package type does the 'ST' suffix indicate for the 24LC512-E/ST?

The 'ST' suffix in 24LC512-E/ST denotes an 8-lead SOIC (Small Outline Integrated Circuit) package with standard 3.90 mm body width, 1.27 mm lead pitch, and JEDEC MS-012AC outline. This package is surface-mount compatible, RoHS-compliant, and widely supported in automated PCB assembly processes for industrial and automotive applications.

Is the 24LC512-E/ST AEC-Q100 qualified, and what grade does it meet?

Yes, the 24LC512-E/ST is AEC-Q100 qualified and meets Grade 1 requirements (–40°C to +125°C ambient operating temperature). This qualification covers stress testing for accelerated life, thermal cycling, humidity bias, and ESD - confirming suitability for automotive powertrain, chassis, and body electronics where reliability under harsh environmental conditions is mandatory.