Microchip Technology 24LC1025T-I/SM

Overview

24LC1025T-I/SM from Microchip Technology Inc. is a 128K × 8 (1024 kbit) I²C-compatible serial EEPROM with hardware write-protection, 128-byte page buffer, and industrial temperature range (–40°C to +85°C). It operates from 2.5V to 5.5V, supports up to 400 kHz clock frequency at V_CC ≥ 2.5V, and delivers ≤450 µA read current and ≤5 µA standby current. It is used in embedded systems for nonvolatile storage of calibration data, configuration settings, and firmware parameters.

For engineers reviewing the 24LC1025T-I/SM datasheet, 24LC1025T-I/SM pinout, 24LC1025T-I/SM application, or 24LC1025T-I/SM equivalent, key selection considerations include its 2.5–5.5V supply range, 128-byte page write capability, Schmitt-triggered SDA/SCL inputs for noise immunity, hardware WP pin for block-level write protection, and cascading support for up to four devices on one I²C bus.

Technical Context

The 24LC1025T-I/SM implements a two-wire I²C interface with master-controlled clock (SCL) and bidirectional open-drain data (SDA), requiring external pull-up resistors. Its internal address counter enables sequential reads across 512 kbit segments (00000h–0FFFFh and 10000h–1FFFFh), with block select bit B₀ controlling access between them.

Write operations are self-timed: byte writes complete in ≤5 ms, and page writes (up to 128 bytes) also require ≤5 ms. The device uses an internal high-voltage generator for EEPROM programming and incorporates slope control on outputs to suppress ground bounce during switching.

Key Specifications

Pinout & Package

24LC1025T-I/SM is housed in an 8-lead SOIC package (3.90 mm width), RoHS-compliant and Pb-free, with standard 1.27 mm pitch and JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA1025-I/SM, the 24LC1025T-I/SM trades lower-voltage operation for guaranteed 400 kHz performance across its full 2.5–5.5V range; versus AT24C1024-MAHM-T, it requires stricter A2 pin handling but maintains Microchip's long-term supply commitment and industrial temp validation.

Availability

24LC1025T-I/SM is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, automotive body control modules, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for 24LC1025T-I/SM 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 reliability and long-term product availability.

The 24LC1025T-I/SM belongs to Microchip's 24XX1025 family of I²C EEPROMs, designed specifically for robust, low-power nonvolatile data storage in industrial, automotive, and medical applications demanding >1M endurance and >200-year retention.

FAQ

What is the maximum I²C clock frequency supported by the 24LC1025T-I/SM?

The 24LC1025T-I/SM supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher. At voltages below 2.5V, the maximum clock drops to 100 kHz. This dual-speed capability ensures compatibility with both legacy 100 kHz systems and modern higher-throughput designs while maintaining signal integrity across its specified voltage range.

Does the 24LC1025T-I/SM require external pull-up resistors on SDA and SCL lines?

Yes, the 24LC1025T-I/SM requires external pull-up resistors on both SDA and SCL lines because these pins are open-drain. Typical values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz, selected based on bus capacitance and rise-time requirements defined in the I²C specification.

How does the A2 pin function on the 24LC1025T-I/SM?

The A2 pin on the 24LC1025T-I/SM is a non-configurable chip select that must be hard-wired to VCC for proper operation. If left floating or tied to VSS, device behavior is undefined. This design ensures deterministic addressing and prevents unintended activation in multi-device I²C configurations.

What is the purpose of the WP pin on the 24LC1025T-I/SM?

The WP (Write-Protect) pin on the 24LC1025T-I/SM enables hardware-level protection of the entire memory array. When tied to VCC, all write operations are inhibited while read access remains fully functional - a critical feature for safeguarding calibration data, security keys, or firmware parameters from accidental overwrite.

Can the 24LC1025T-I/SM perform sequential reads across its full 1024 kbit address space?

No, sequential reads on the 24LC1025T-I/SM are limited to 512 kbit segments due to internal addressing boundaries: 00000h–0FFFFh and 10000h–1FFFFh. To read across the full memory, two separate sequential read commands must be issued - one for each segment - as the internal address counter rolls over within each block rather than across the entire array.