Microchip Technology 24LC025-E/SN

Overview

24LC025-E/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8) I²C-compatible serial EEPROM designed for nonvolatile data storage in embedded systems. It operates from 2.5V to 5.5V, supports 400 kHz clock rate, features 16-byte page write buffer, and delivers ≤5 ms write cycle time. Used in industrial sensor calibration, power supply configuration, and firmware parameter retention where low-power, noise-immune bus interface is required.

For engineers reviewing the 24LC025-E/SN datasheet, 24LC025-E/SN pinout, 24LC025-E/SN application, or 24LC025-E/SN equivalent, key selection criteria include its automotive-grade temperature range (–40°C to +125°C), absence of hardware write-protect pin, SOT-23-6 package compatibility, and Schmitt-triggered I²C inputs for robust operation in electrically noisy environments.

Technical Context

The 24LC025-E/SN implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A0, A1, A2). Its internal architecture includes a 16-byte page write buffer, self-timed erase/write logic, and voltage threshold detection that disables writes below 1.5V.

Unlike the 24LC024 variant, the 24LC025-E/SN omits the WP pin-confirmed by datasheet Note: "WP pin is not internally connected on the 24XX025"-and uses only five functional pins in the SOT-23-6 package (A0, A1, VSS, SDA, SCL, VCC), with A2 unconnected per Pin Function Table.

Key Specifications

Pinout & Package

24LC025-E/SN is packaged in a Pb-free, RoHS-compliant 6-lead SOT-23 case (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm. This compact surface-mount package supports high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC025-I/SN, the 24LC025-E/SN provides extended high-temperature operation essential for automotive powertrain and chassis modules; compared with AT24C02D-SSHM-T, it offers smaller footprint and lower profile but lacks hardware write protection and requires software-based access control.

Availability

24LC025-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and medical device parameter storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24LC025-E/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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC025-E/SN belongs to Microchip's legacy serial EEPROM product line, engineered specifically for reliable, low-power, I²C-based nonvolatile data storage in harsh industrial and automotive environments.

FAQ

What is the maximum I²C clock frequency supported by the 24LC025-E/SN?

The 24LC025-E/SN supports up to 400 kHz I²C clock frequency across its full 2.5V–5.5V supply range, meeting Fast Mode I²C specification. At VCC ≥ 2.5V, timing parameters such as THIGH (≥600 ns) and TLOW (≥1300 ns) are guaranteed per DS21210N-page 3, enabling high-throughput page writes without bus contention.

Does the 24LC025-E/SN have a hardware write-protect pin?

No, the 24LC025-E/SN does not include a hardware write-protect (WP) pin. As explicitly stated in the datasheet: "WP pin is not internally connected on the 24XX025." This distinguishes it from the 24LC024 variant and eliminates external WP circuitry, simplifying design but requiring software-level write control for data integrity.

Which package type is used for the 24LC025-E/SN part number?

The 24LC025-E/SN uses the 6-lead SOT-23 package (JEDEC MO-178AA), confirmed by the "Package Types" table and Pin Function Table in DS21210N. This compact surface-mount package measures 2.9 mm × 1.6 mm × 1.1 mm and supports automated placement in space-constrained applications.

What is the memory organization of the 24LC025-E/SN?

The 24LC025-E/SN contains 2 Kbit of EEPROM organized as 256 words × 8 bits. Its linear address space spans 0x00 to 0xFF, with internal address pointer auto-incrementing during sequential reads and wrapping from 0xFF back to 0x00, enabling continuous block reads without address overflow handling.

How many 24LC025-E/SN devices can be connected on a single I²C bus?

Up to four 24LC025-E/SN devices can share one I²C bus. Because the SOT-23-6 package lacks the A2 pin (unconnected), only A0 and A1 are available for chip select, yielding 2² = 4 unique slave addresses (1010 00 R/W through 1010 11 R/W) per DS21210N-page 5.