Microchip Technology 24LC512-I/P

Overview

24LC512-I/P from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit memory, operating at 2.5–5.5 V with industrial temperature range (−40°C to +85°C), 400 µA max read current, and 128-byte page write buffer. It serves as nonvolatile configuration storage in embedded controllers, power supplies, and sensor modules requiring reliable data retention over 200 years.

For engineers reviewing the 24LC512-I/P datasheet, 24LC512-I/P pinout, 24LC512-I/P application, or 24LC512-I/P equivalent, key selection considerations include its 400 kHz I²C clock support at V_CC ≥ 2.5 V, 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/P implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, supports standard-mode (100 kHz) and fast-mode (400 kHz) timing, and uses internal address pointer logic for sequential reads across the full 512 Kbit address space. Its page write architecture buffers up to 128 bytes before initiating a self-timed 5 ms erase/write cycle.

Hardware write protection is enforced via the WP pin sampled at the Stop bit of each write command; tying WP to V_CC disables all writes while preserving read functionality. The device features Schmitt-trigger inputs (V_HYS = 0.05 V_CC) and slope-controlled outputs to suppress ground bounce and improve noise immunity in electrically noisy environments.

Key Specifications

Pinout & Package

24LC512-I/P is supplied in an 8-lead PDIP (Plastic Dual In-Line Package) with 300 mil body width, suitable for through-hole prototyping and legacy industrial PCBs. Pin 1 is marked by a notch or dot; leads are tin-plated matte finish per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA512-I/P and AT24C512BN-SH-T, the 24LC512-I/P offers optimal balance of industrial temperature support, proven reliability in 2.5–5.5 V systems, and seamless integration into legacy I²C designs - making it ideal for cost-sensitive, high-volume industrial controls where voltage margin is not constrained below 2.5 V.

Availability

24LC512-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration storage, and power supply fault logging requiring stable component supply and long-term lifecycle assurance.

Supply support for 24LC512-I/P 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-I/P belongs to Microchip's 24XX512 family of I²C serial EEPROMs, engineered for robust nonvolatile data storage in industrial, automotive, and medical applications demanding high endurance and long-term data integrity.

FAQ

What is the minimum V_CC required for reliable operation of the 24LC512-I/P?

The 24LC512-I/P requires a minimum V_CC of 2.5 V for guaranteed operation across its full industrial temperature range (−40°C to +85°C). Below 2.5 V, timing parameters degrade and clock frequency is limited to 100 kHz; operation below 2.5 V is not specified and may result in unpredictable behavior. Always verify V_CC stability under load using the 24LC512-I/P's 1 µA standby current specification.

How does the WP pin function on the 24LC512-I/P, and when is it sampled?

The WP (Write-Protect) pin on the 24LC512-I/P disables all write operations-including byte and page writes-when tied to V_CC, while permitting unrestricted reads. It is sampled only at the Stop bit of each I²C write command, meaning toggling WP during an active transaction has no effect. This behavior ensures deterministic protection against accidental writes during bus activity, and the 24LC512-I/P will acknowledge the command but skip the internal programming cycle if WP is asserted.

Can multiple 24LC512-I/P devices share the same I²C bus, and how is addressing managed?

Yes, up to eight 24LC512-I/P devices can operate on a single I²C bus using hardware address pins A0, A1, and A2. Each device's 7-bit client address is formed as 1010 A2 A1 A0, allowing unique identification. These pins must be hardwired to VSS or VCC before communication begins; floating connections cause undefined behavior. The 24LC512-I/P does not support dynamic address changes during operation, so address configuration is fixed per device instance.

What is the maximum page write size supported by the 24LC512-I/P, and what happens if more than that is sent?

The 24LC512-I/P supports a maximum page write size of 128 bytes. If the host transmits more than 128 bytes before issuing a Stop condition, the internal address counter rolls over within the same physical page, causing earlier bytes to be overwritten. Page boundaries align to 128-byte intervals (e.g., 0x0000–0x007F), and crossing a boundary results in wraparound-not automatic advancement to the next page. Application firmware must enforce page-aligned writes to prevent data corruption.

Does the 24LC512-I/P support sequential reads across the entire 512 Kbit memory space?

Yes, the 24LC512-I/P supports uninterrupted sequential reads across its full 64K address space (0x0000 to 0xFFFF). After transmitting the starting address in a random read setup, the device increments its internal address pointer automatically with each byte acknowledged by the host. Upon reaching address 0xFFFF, the pointer wraps to 0x0000, enabling continuous streaming without host-side address management-ideal for firmware patch loading or bulk parameter retrieval.