Microchip Technology 24LC1025-I/SN

Overview

24LC1025-I/SN from Microchip Technology Inc. is a 128K × 8 (1024 kbit) I²C-compatible serial EEPROM with industrial temperature range (–40°C to +85°C), 2.5V–5.5V supply voltage, and 400 kHz maximum clock frequency. It features 128-byte page write buffer, hardware write-protection via WP pin, and Schmitt-trigger inputs for noise immunity. Used in embedded systems for parameter storage, calibration data retention, and firmware configuration in industrial controllers and sensor nodes.

For engineers reviewing the 24LC1025-I/SN datasheet, 24LC1025-I/SN pinout, 24LC1025-I/SN application, or 24LC1025-I/SN equivalent, key selection criteria include VCC operating range (2.5–5.5 V), I²C clock compatibility (100/400 kHz), page write time (3 ms typical), endurance (1 million cycles), and data retention (>200 years).

Technical Context

The 24LC1025-I/SN implements a two-wire I²C interface with slave-only operation, supporting standard-mode (100 kHz) and fast-mode (400 kHz) timing per SMBus v2.0. Its internal architecture includes dual 512 kbit memory blocks accessed via block-select bit (B0), enabling contiguous addressing across up to four devices on one bus.

It uses on-chip charge-pump HV generator for EEPROM programming, supports byte and page writes (up to 128 bytes within a physical page), and incorporates slope-controlled outputs to suppress ground bounce. Write protection is enforced by sampling the WP pin at the Stop condition of each write command.

Key Specifications

Pinout & Package

24LC1025-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 3.90 mm body width, RoHS-compliant matte tin (Sn) finish, and JEDEC MS-012AC standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC1025-I/SN, 24AA1025-I/SN offers broader voltage tolerance but reduced clock speed at low VCC, while AT24C1024-10PU-2.7 provides higher bandwidth and flexible addressing at the cost of firmware adaptation and different write-protection implementation.

Availability

24LC1025-I/SN is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, smart metering, and automotive body electronics requiring stable component supply across extended product lifecycles.

Supply support for 24LC1025-I/SN 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 company specializing in microcontrollers, analog devices, and memory products, with a focus on embedded control and connectivity solutions.

The 24LC1025-I/SN belongs to Microchip's 24XX1025 family of I²C EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in industrial and automotive applications demanding long-term data integrity.

FAQ

What is the maximum I²C clock frequency supported by the 24LC1025-I/SN?

The 24LC1025-I/SN supports up to 400 kHz in fast-mode operation when VCC is 2.5 V to 5.5 V. At VCC < 4.5 V in automotive temperature grade, it defaults to 100 kHz. This dual-speed capability ensures compatibility with both legacy and modern I²C masters while maintaining signal integrity across varying supply conditions. The 24LC1025-I/SN does not support 1 MHz operation - that is reserved for the 24FC1025 variant.

How does the WP pin function on the 24LC1025-I/SN?

The WP (Write-Protect) pin on the 24LC1025-I/SN is sampled only at the Stop condition of each write command. When tied to VCC, it inhibits all write operations (byte and page) while allowing unrestricted reads. When tied to VSS, writes are enabled. The 24LC1025-I/SN does not support partial-array protection - the entire 1024 kbit memory is locked or unlocked globally. This hardware-level lock prevents corruption during power brownouts or firmware faults.

Can the 24LC1025-I/SN be used with a 1.8 V microcontroller I²C interface?

No, the 24LC1025-I/SN requires a minimum VCC of 2.5 V and is not guaranteed to operate correctly with 1.8 V I²C signaling levels. Its input thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC) yield VIH ≥ 1.75 V at VCC = 2.5 V, which exceeds typical 1.8 V system high-level logic. For 1.8 V systems, consider the 24AA1025-I/SN (1.7–5.5 V) or 24FC1025-I/SN (1.8–5.5 V) variants instead. The 24LC1025-I/SN must be powered from a ≥2.5 V rail and interfaced with level-shifted I²C signals if the controller operates at 1.8 V.

What is the physical page size and boundary constraint for page writes on the 24LC1025-I/SN?

The 24LC1025-I/SN has a 128-byte physical page size, with boundaries aligned to integer multiples of 128 (e.g., 0x0000–0x007F, 0x0080–0x00FF). Page writes crossing these boundaries wrap around within the current page instead of advancing to the next. Therefore, software must ensure address + byte count ≤ next boundary. Attempting to write across 0x007F→0x0080 will overwrite data starting at 0x0000. This constraint applies regardless of how many bytes are written - even a 2-byte write straddling a boundary triggers wraparound.

Does the 24LC1025-I/SN support sequential reads across its full 1024 kbit address space?

No, sequential reads on the 24LC1025-I/SN are limited to 512 kbit segments due to internal memory segmentation. Valid sequential read ranges are 0x00000–0x0FFFF (first 512 kbit block) and 0x10000–0x1FFFF (second 512 kbit block). Reads crossing either boundary (e.g., from 0x0FFFF to 0x10000) will roll over to the start of the same block (0x00000 or 0x10000). To access the full array sequentially, two separate read commands - one per block - are required, with explicit block-select bit (B0) control in the I²C control byte.