Microchip Technology 24LC512-E/MF

Overview

24LC512-E/MF from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit memory, 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 supports page writes up to 128 bytes and hardware write-protection via the WP pin for embedded data logging and configuration storage.

For engineers reviewing the 24LC512-E/MF datasheet, 24LC512-E/MF pinout, 24LC512-E/MF application, or 24LC512-E/MF equivalent, key selection criteria include its extended-temperature operation, I²C bus compatibility up to 400 kHz, 128-byte page buffer, hardware write-protect functionality, and availability in 8-lead DFN (MF) package with RoHS-compliant lead-free finish.

Technical Context

The 24LC512-E/MF implements a two-wire I²C interface with Schmitt-trigger inputs on SDA and SCL for noise immunity, slope-controlled outputs to suppress ground bounce, and internal address pointer logic enabling sequential, random, and current-address read modes. Its EEPROM array uses floating-gate technology with on-chip charge pump for erase/write operations.

It supports cascaded bus topology via three hardware-configurable chip-select pins (A0–A2), allowing up to eight devices on one I²C bus for up to 4 Mbit total address space. Write cycles are self-timed (max 5 ms), and acknowledge polling is supported to determine write completion without fixed delay timing.

Key Specifications

Pinout & Package

24LC512-E/MF is supplied in an 8-lead 3×2 mm DFN package (Microchip package code MF), with exposed pad (optional VSS connection), moisture-sensitive level 1, and Pb-free matte tin finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512-E/MF, the 24AA512-I/MF offers wider voltage range but sacrifices extended-temperature capability, while the AT24C512BN-SH-B provides identical electrical specs in SOIC-8 but omits the hardware WP pin - making 24LC512-E/MF the only option combining extended temp, hardware write-protect, and DFN packaging.

Availability

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

Supply support for 24LC512-E/MF 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 24LC512 belongs to Microchip's 24XX512 family of I²C serial EEPROMs, designed specifically for robust, low-power, nonvolatile data storage in automotive, industrial, and medical systems demanding extended temperature operation and hardware-level data protection.

FAQ

What is the maximum I²C clock frequency supported by the 24LC512-E/MF?

The 24LC512-E/MF supports a maximum I²C clock frequency of 400 kHz when VCC is 2.5V or higher. This is specified in the Device Selection Table and confirmed in Table 1-2 AC Characteristics. The device does not support 1 MHz operation - that capability is exclusive to the 24FC512 variant. At VCC < 2.5V, the 24LC512-E/MF is not rated for operation, as its minimum supply voltage is 2.5V.

Does the 24LC512-E/MF have hardware write-protection, and how is it implemented?

Yes, the 24LC512-E/MF includes hardware write-protection via the dedicated WP (Write-Protect) pin. When WP is tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional. When WP is tied to VSS, full read/write access is enabled. The WP state is sampled at the Stop bit of each write command, ensuring deterministic protection behavior independent of software control.

What package type does the 24LC512-E/MF use, and what are its key mechanical features?

The 24LC512-E/MF uses an 8-lead 3×2 mm DFN package (Microchip package code MF), with an exposed thermal pad on the bottom surface. The package is RoHS-compliant, lead-free, and moisture-sensitive level 1. The exposed pad may be connected to VSS for improved thermal dissipation and EMI performance, or left floating per design requirements.

How many devices can be connected on the same I²C bus using the 24LC512-E/MF?

Up to eight 24LC512-E/MF devices can be connected on the same I²C bus using the three hardware address pins A0, A1, and A2. Each pin must be hard-wired to either VCC or VSS to configure a unique 3-bit chip address. This enables a total addressable space of up to 4 Mbit (8 × 512 Kbit) without requiring additional address decoding logic or multiplexers.

What is the page write buffer size of the 24LC512-E/MF, and why does it matter?

The 24LC512-E/MF has a 128-byte page write buffer. This means up to 128 bytes can be loaded into the internal latch and written to memory in a single self-timed cycle (max 5 ms), rather than executing 128 individual byte writes (each requiring ~5 ms). This reduces total programming time by >95% for block updates and minimizes I²C bus occupation - critical for real-time systems where bus arbitration latency must be predictable and bounded.