Microchip Technology 24LC512-I/MF

Overview

24LC512-I/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 industrial temperature range (−40°C to +85°C), 400 µA max read current, 1 µA max standby current, and 128-byte page write buffer. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the 24LC512-I/MF datasheet, 24LC512-I/MF pinout, 24LC512-I/MF application, or 24LC512-I/MF equivalent, key selection factors include its 400 kHz I²C clock support at 2.5V+, hardware write-protect (WP) pin, Schmitt-trigger noise immunity on SDA/SCL, and cascading capability for up to eight devices on one bus.

Technical Context

The 24LC512-I/MF implements a two-wire I²C interface with open-drain SDA/SCL requiring external pull-ups, supports standard-mode (100 kHz) and fast-mode (400 kHz) timing per I²C specification, and uses internal address pointer logic for sequential reads across the full 64K address space. Its write protection is controlled solely by the WP pin level (VSS = enabled, VCC = disabled).

Page write operations are constrained to 128-byte boundaries aligned to physical page starts (e.g., 0x0000–0x007F); crossing boundaries causes wraparound within the same page. Acknowledge polling is required to detect write cycle completion, as the device halts ACK generation during internal erase/write cycles lasting up to 5 ms.

Key Specifications

Pinout & Package

24LC512-I/MF is packaged in an 8-lead DFN (5 mm × 6 mm, 0.9 mm height) with exposed pad. Pin 1 is A0; pin numbering follows standard DFN top-view orientation (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512-I/MF, 24AA512-I/MF extends operational voltage down to 1.7V for battery-backed systems, while AT24C512BN-SH-B trades hardware addressing for 1 MHz I²C speed-neither offers pin compatibility, so PCB redesign is required for either alternative.

Availability

24LC512-I/MF is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system boot configuration, and automotive body control module applications requiring stable component supply and long-term lifecycle support.

Supply support for 24LC512-I/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 infrastructure.

The 24XX512 family-including 24LC512-I/MF-is engineered for reliable nonvolatile data storage in space-constrained, low-power embedded systems where I²C interface simplicity and industrial-grade endurance are critical.

FAQ

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

The 24LC512-I/MF requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (−40°C to +85°C). Below 2.5V, functionality is not specified-unlike the 24AA512 variant, which supports down to 1.7V. This makes the 24LC512-I/MF appropriate for 3.3V and 5V systems but unsuitable for single-cell Li-ion or coin-cell applications without regulation.

How does the WP pin function on the 24LC512-I/MF, and what happens if it floats?

The WP pin on the 24LC512-I/MF must be actively driven to either VSS (write enabled) or VCC (write protected); it is not internally biased. If left floating, write behavior is undefined and may result in partial or failed writes due to noise-induced state transitions. Microchip specifies that WP is sampled only at the Stop bit of each write command, so toggling WP mid-cycle has no effect-only the level present at Stop determines protection status.

Can the 24LC512-I/MF perform sequential reads across the entire 64K memory space without interruption?

Yes-the 24LC512-I/MF supports uninterrupted sequential reads across the full 64K address space (0x0000 to 0xFFFF). After reading address 0xFFFF, the internal address pointer automatically rolls over to 0x0000, allowing continuous streaming. This behavior is inherent to the device's address counter architecture and requires no host-side address management beyond issuing ACKs until the final byte.

What is the maximum number of 24LC512-I/MF devices that can be connected to a single I²C bus, and how is addressing managed?

Up to eight 24LC512-I/MF devices can share one I²C bus using the three hardware address pins (A0, A1, A2), which configure the three LSBs of the 7-bit slave address (base 0x50). Each device must have a unique combination of A0–A2 tied to VSS or VCC-no floating connections. The resulting addresses range from 0x50 to 0x57, enabling scalable memory expansion without software address translation.

Does the 24LC512-I/MF require external pull-up resistors on SDA and SCL, and what values are recommended?

Yes-SDA and SCL are open-drain outputs and require external pull-up resistors to VCC. For 400 kHz operation, Microchip recommends 2 kΩ; for 100 kHz, 10 kΩ is typical. Values must balance rise time (≤300 ns at 400 kHz) against bus capacitance and drive strength: lower resistance improves speed but increases static current, especially with multiple devices.