Microchip Technology 24LC024H-E/P

Overview

24LC024H-E/P 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, 1 μA standby current, and hardware write protection for the upper half-array (80h–FFh). It targets embedded system configuration storage, sensor calibration data retention, and firmware parameter backup in industrial controllers.

For engineers reviewing the 24LC024H-E/P datasheet, 24LC024H-E/P pinout, 24LC024H-E/P application, or 24LC024H-E/P equivalent, key selection considerations include its automotive-grade temperature range (–40°C to +125°C), page-write buffer (up to 16 bytes), Schmitt-trigger SDA/SCL inputs for noise immunity, and 1 million erase/write cycles with >200-year data retention.

Technical Context

The 24LC024H-E/P implements a standard two-wire I²C interface with slave address format '1010 A2 A1 A0 R/W', supporting up to eight devices on one bus via configurable A0–A2 pins. Its internal address pointer enables current-address, random, and sequential read modes without external address latching.

Write operations use an on-chip 16-byte page buffer and self-timed internal erase/write cycle (max 5 ms), while hardware write protection is controlled solely by the WP pin state-tied to VCC to lock addresses 80h–FFh, or VSS to disable protection entirely.

Key Specifications

Pinout & Package

24LC024H-E/P is supplied in 8-pin PDIP (plastic dual in-line package) with 300-mil body width, lead finish matte tin (Pb-free), and RoHS compliance. Pin 1 is marked with a notch or dot; orientation follows standard DIP numbering (counterclockwise from notch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC024H-E/P, the 24LC024T-I/P trades automotive qualification and 1 MHz speed for lower cost in benign environments, while the AT24C02C-SSHM-T replaces hardware WP with software lock bits-increasing firmware complexity but enabling finer-grained protection control.

Availability

24LC024H-E/P is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive sensor calibration data retention, and medical device runtime parameter backup requiring stable component supply across extended product lifecycles.

Supply support for 24LC024H-E/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 nonvolatile memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC024H-E/P belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, and pin-efficient nonvolatile data storage in automotive, industrial, and medical systems demanding extended temperature operation and hardware-level data integrity.

FAQ

What is the maximum I²C clock frequency supported by the 24LC024H-E/P?

The 24LC024H-E/P supports up to 1 MHz I²C clock frequency when VCC is between 2.5V and 5.5V. This is confirmed in the Device Selection Table and AC Characteristics section of the DS22102A datasheet. Operation above 400 kHz requires stricter timing margins: SDA/SCL rise/fall times ≤300 ns and setup/hold times reduced versus 100 kHz mode. The 24LC024H-E/P does not support 1 MHz below 2.5V - that range is exclusive to the 24AA024H variant.

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

Hardware write protection on the 24LC024H-E/P is controlled exclusively by the WP pin: when tied to VCC, addresses 80h–FFh (upper 128 bytes) are locked against write or erase; when tied to VSS, full-array write access is enabled. This protection is active regardless of I²C command - even if a write command targets the protected region, the device acknowledges but ignores the data. No software configuration or unlock sequence is required.

What packages are available for the 24LC024H-E/P, and what does the '-E/P' suffix indicate?

The '-E/P' suffix in 24LC024H-E/P specifies the automotive temperature grade (E: –40°C to +125°C) and 8-pin PDIP package (P). Per the Packaging Information section, this part is offered in PDIP, SOIC, TSSOP, MSOP, and TDFN - but the -E/P variant is explicitly the PDIP version. The marking "L24H" appears on the top surface, with "I/P" or "E/P" denoting temperature/package; the 'E' confirms AEC-Q100-aligned qualification for automotive use.

Can multiple 24LC024H-E/P devices share the same I²C bus, and how are they addressed?

Yes, up to eight 24LC024H-E/P devices can share one I²C bus using the A0, A1, and A2 pins to configure unique 3-bit chip select codes. Each device's slave address is formed as '1010 A2 A1 A0 R/W', where R/W = 0 for write and 1 for read. All three address pins must be hardwired to VSS or VCC (not left floating) to ensure deterministic addressing. This enables contiguous 16 Kbit memory expansion when combined with proper software address mapping.

What is the write cycle time for the 24LC024H-E/P, and how can it be managed in firmware?

The 24LC024H-E/P has a maximum write cycle time of 5 ms for both byte and page writes, as specified in Table 1-2 (Parameter TWC). Firmware must either wait 5 ms after each Stop condition initiating a write, or use acknowledge polling: repeatedly send Start + control byte (R/W = 0) until the device responds with ACK, indicating write completion. Polling avoids fixed delays and maximizes bus utilization - especially critical in real-time systems where deterministic latency matters.