Microchip Technology 24LC1025-E/P

Overview

24LC1025-E/P from Microchip Technology Inc. is a 128K × 8 (1024 kbit) I²C-compatible serial EEPROM with hardware write-protection, 128-byte page buffer, and automotive-grade temperature support (–40°C to +125°C). It operates from 2.5V to 5.5V, supports up to 400 kHz clock frequency at full V_CC, and delivers 450 µA read current and 5 µA standby current. Used for nonvolatile configuration storage in engine control units and ADAS modules.

For engineers reviewing the 24LC1025-E/P datasheet, 24LC1025-E/P pinout, 24LC1025-E/P application, or 24LC1025-E/P equivalent, key selection criteria include its AEC-Q100-qualified automotive temperature range, hardware WP pin behavior, 128-byte page write capability, and dual 512 kbit address segments requiring B0 block select bit management.

Technical Context

The 24LC1025-E/P implements a two-wire I²C interface with Schmitt-trigger inputs on SDA/SCL for noise immunity and slope-controlled outputs to suppress ground bounce. Its internal architecture includes a 128-byte page latch, dual 512 kbit memory blocks (00000h–0FFFFh and 10000h–1FFFFh), and an address pointer that auto-increments during sequential reads.

Write protection is enforced via the WP pin: tied to V_CC, it disables all writes while permitting reads; tied to V_SS, writes are enabled. The A2 pin is non-configurable and must be hard-wired to V_CC; A0 and A1 provide user-selectable chip addressing for multi-device bus configurations.

Key Specifications

Pinout & Package

24LC1025-E/P is supplied in an 8-lead PDIP (plastic dual in-line package) with 300-mil body width and through-hole mounting. Pin 1 is A0, pin 4 is V_SS, pin 8 is V_CC, and pin 3 (A2) must be externally tied to V_CC for guaranteed operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC1025-E/P, the 24AA1025-I/P offers broader voltage tolerance but lacks automotive temperature validation, while the AT24C1024-MAHM-T provides faster clock support and simplified pinout at the expense of AEC-Q100 qualification and mandatory A2 wiring.

Availability

24LC1025-E/P is available at Aetrix Electronics and suitable for engine control units, ADAS sensors, and body control modules requiring stable component supply across extended automotive lifecycles.

Supply support for 24LC1025-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products for industrial, automotive, and consumer applications.

The 24LC1025-E/P belongs to Microchip's automotive-qualified serial EEPROM family, designed specifically for robust nonvolatile data storage in harsh-temperature, high-reliability vehicle subsystems.

FAQ

What is the required external connection for the A2 pin on the 24LC1025-E/P?

The A2 pin on the 24LC1025-E/P must be hard-wired to V_CC. If left floating or tied to V_SS, device operation becomes undefined. This is a fixed hardware requirement-not a configuration option-and applies across all operating conditions including automotive temperature extremes.

Does the 24LC1025-E/P support true 1 MHz I²C operation?

No, the 24LC1025-E/P does not support 1 MHz I²C operation. Its maximum clock frequency is 400 kHz at V_CC ≥ 4.5V in automotive grade; it drops to 100 kHz when V_CC < 4.5V. The 1 MHz rating applies only to the 24FC1025 variant, not the 24LC1025-E/P.

How does write protection work on the 24LC1025-E/P?

Write protection on the 24LC1025-E/P is controlled solely by the WP pin: when tied to V_CC, all write operations (byte and page) are inhibited while reads remain fully functional; when tied to V_SS, full read/write access is enabled. The WP state is sampled at the Stop bit of each write command.

Can the 24LC1025-E/P perform sequential reads across its full 1024 kbit address space?

No, sequential reads on the 24LC1025-E/P are limited to 512 kbit segments: addresses 00000h–0FFFFh and 10000h–1FFFFh. To read across the full memory, two separate sequential read operations-each targeting one segment with appropriate B0 bit setting-are required.

What is the endurance specification for the 24LC1025-E/P, and how is it measured?

The 24LC1025-E/P is rated for 1,000,000 erase/write cycles per page at 25°C and V_CC = 5.5V. Endurance is specified per physical page (128 bytes), not per byte; writing any byte within a page subjects the entire page to a full write cycle, affecting its remaining endurance count.