Microchip Technology 24LC025T-E/OT

Overview

24LC025T-E/OT 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 400 kHz max clock rate and industrial–automotive temperature range (−40°C to +125°C). It features 16-byte page write buffer, 5 ms max write cycle time, and Schmitt-trigger inputs for noise immunity - deployed in automotive body control modules for storing calibration data and configuration parameters.

For engineers reviewing the 24LC025T-E/OT datasheet, 24LC025T-E/OT pinout, 24LC025T-E/OT application, or 24LC025T-E/OT equivalent, key selection criteria include its SOT-23-6 package compatibility, absence of hardware write-protect (WP not connected), automotive-grade reliability, and cascading support for up to four devices on one I²C bus.

Technical Context

The 24LC025T-E/OT implements a standard two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, and uses internal address pointer logic enabling current-address, random, and sequential read modes. Its memory array supports byte and page writes with automatic address incrementing within 16-byte boundaries.

It integrates Schmitt-trigger inputs and input filtering (50 ns spike suppression) for robust operation in electrically noisy environments, and includes VCC threshold detection that disables write operations below 1.5V to prevent data corruption during brown-out conditions.

Key Specifications

Pinout & Package

24LC025T-E/OT is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package. Pin 1 is marked by laser indentation; pin 3 is SDA (bidirectional open-drain data line), pin 1 is SCL (input-only clock), pins 4 and 5 are address inputs A1 and A0, pin 2 is VSS (ground), and pin 6 is VCC (power supply). The WP pin is not internally connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA025T-I/OT, the 24LC025T-E/OT trades lower-voltage operation for enhanced automotive qualification and tighter parametric control at 2.5V+, while versus AT24C02D-SSHM-T it sacrifices WP functionality and package size for superior thermal ruggedness and smaller PCB footprint.

Availability

24LC025T-E/OT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor nodes, and smart lighting controllers requiring stable component supply across extended product lifecycles.

Supply support for 24LC025T-E/OT 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 manufacturing and support infrastructure.

The 24LC025T-E/OT belongs to Microchip's automotive-qualified serial EEPROM family, designed specifically for reliable nonvolatile data storage in harsh environments where extended temperature operation and long-term data integrity are critical.

FAQ

What is the maximum I²C clock frequency supported by the 24LC025T-E/OT?

The 24LC025T-E/OT supports up to 400 kHz I²C clock frequency across its full operating voltage range of 2.5V to 5.5V. This is confirmed in the Device Selection Table and AC Characteristics section of DS21210N, where FCLK is specified as 400 kHz for VCC ≥ 2.5V. Operation at 100 kHz is only required below 2.5V - which does not apply to this part.

Does the 24LC025T-E/OT have a hardware write-protect (WP) pin?

No, the 24LC025T-E/OT does not have a functional hardware write-protect pin. As explicitly stated in the datasheet: "WP pin is not internally connected on the 24XX025" and "WP pin is not available on the SOT-23 package." This applies directly to 24LC025T-E/OT, which uses the SOT-23-6 package and belongs to the 24LC025 variant.

What is the memory organization of the 24LC025T-E/OT?

The 24LC025T-E/OT contains 2 Kbit of EEPROM memory organized as 256 words × 8 bits. This structure is defined in the Description section of DS21210N and confirmed in the Device Selection Table. Each word corresponds to a unique 8-bit address from 0x00 to 0xFF, supporting both byte and 16-byte page write operations.

Which packages are available for the 24LC025T-E/OT?

The 24LC025T-E/OT is exclusively offered in the 6-lead SOT-23 package, as documented in the Device Selection Table and Package Types section of DS21210N. Other variants like 24LC024 are available in PDIP, SOIC, TSSOP, DFN, TDFN, and MSOP, but the 24LC025 variant is restricted to SOT-23 - and the "T-E/OT" suffix confirms the tape-and-reel automotive-grade SOT-23 variant.

What is the endurance rating and data retention specification for the 24LC025T-E/OT?

The 24LC025T-E/OT is rated for more than 1 million erase/write cycles and guarantees data retention exceeding 200 years at 25°C, as stated in the Features list and confirmed in Table 1-2 (Endurance parameter #18). These values are characterized per Microchip's Total Endurance™ Model and apply to the automotive-grade E-temp version.