Microchip Technology 24LC024H-E/ST

Overview

24LC024H-E/ST from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 2.5V to 5.5V with 1 MHz clock support in automotive temperature range (–40°C to +125°C). It features hardware write protection for the upper half-array (80h–FFh), 16-byte page write buffer, and Schmitt-trigger inputs for noise immunity. Used for secure parameter storage in automotive body control modules, engine management sensors, and infotainment system configuration.

For engineers reviewing the 24LC024H-E/ST datasheet, 24LC024H-E/ST pinout, 24LC024H-E/ST application, or 24LC024H-E/ST equivalent, key selection criteria include VCC min/max compatibility, WP pin behavior under automotive thermal stress, I²C timing compliance at 1 MHz, and half-array hardware write protection scope.

Technical Context

The 24LC024H-E/ST implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A0–A2), enabling up to eight devices on one bus. Its internal address pointer auto-increments during sequential reads and wraps from FFh to 00h.

Write operations use an on-chip 16-byte page buffer and self-timed erase/write cycle (max 5 ms); hardware write protection is controlled solely by the WP pin state-tied to VCC for protecting addresses 80h–FFh, or VSS for full array access. No software lock or register configuration is required.

Key Specifications

Pinout & Package

24LC024H-E/ST is supplied in an 8-pin TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and Pb-free. Pin functions are electrically identical across all 8-pin variants (PDIP, SOIC, MSOP, TDFN), with standardized pin numbering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA024H-E/ST and AT24C02C-SSHM-T, the 24LC024H-E/ST uniquely combines 1 MHz speed, automotive temperature rating, and dedicated hardware write protection for the upper memory block - eliminating firmware dependencies for safety-critical data integrity.

Availability

24LC024H-E/ST is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and medical device configuration storage requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC024H-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 leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24LC024H product line delivers automotive-qualified serial EEPROMs optimized for reliable, low-power, noise-immune nonvolatile storage in harsh environments - specifically targeting ECU, body electronics, and ADAS subsystems.

FAQ

What is the minimum VCC required for reliable operation of the 24LC024H-E/ST?

The 24LC024H-E/ST requires a minimum VCC of 2.5V for guaranteed operation across its full automotive temperature range (–40°C to +125°C). Below 2.5V, functionality is not specified - unlike the 24AA024H variant, which supports down to 1.7V. This 2.5V threshold ensures stable internal charge pump and write verification at elevated temperatures.

Does the 24LC024H-E/ST support 1 MHz I²C communication at all VCC levels?

Yes, the 24LC024H-E/ST supports 1 MHz I²C clock frequency across its entire rated VCC range of 2.5V to 5.5V. This is explicitly confirmed in the Device Selection Table and AC Characteristics table (Param No. 1, FCLK), distinguishing it from the 24AA024H, which is limited to 400 kHz maximum.

How does hardware write protection work on the 24LC024H-E/ST?

Hardware write protection on the 24LC024H-E/ST is controlled exclusively by the WP pin: when tied to VCC, addresses 80h–FFh (upper 128 bytes) are permanently protected from write or erase operations; when tied to VSS, the entire 256-byte array is writable. No command, register, or software action can override this pin-driven behavior.

Can multiple 24LC024H-E/ST devices share the same I²C bus?

Yes, up to eight 24LC024H-E/ST devices can operate on a single I²C bus using the A0, A1, and A2 pins to configure unique 3-bit chip select codes. Each device responds only to its assigned 7-bit slave address (1010xxxR/W), enabling scalable memory expansion to 16 Kbits without additional address decoding logic.

What is the write cycle time specification for the 24LC024H-E/ST?

The 24LC024H-E/ST has a maximum write cycle time of 5 ms for both byte and page writes, as specified in Table 1-2 (Param No. 17, TWC). This self-timed internal cycle includes erase, program, and verification - and must be observed even when writing to unprotected memory or when WP is asserted.