Microchip Technology 24LC02BT-E/ST

Overview

24LC02BT-E/ST from Microchip Technology Inc. is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protection, 8-byte page buffer, and operation over 2.5V–5.5V supply. It supports 400 kHz clock frequency, delivers ≤1 mA read current and ≤5 µA standby current at extended temperature (−40°C to +125°C), and is used for storing calibration data, configuration settings, and device identifiers in industrial sensors and embedded controllers.

For engineers reviewing the 24LC02BT-E/ST datasheet, 24LC02BT-E/ST pinout, 24LC02BT-E/ST application, or 24LC02BT-E/ST equivalent, key selection criteria include its E-temp grade support, SOIC-8 wettable flanks package, I²C address compatibility (1010xxx0/1), WP-controlled full-array write protection, and guaranteed 1 million erase/write cycles with >200-year data retention.

Technical Context

The 24LC02BT-E/ST implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes an 8-byte page latch, address pointer auto-increment logic, and HV generator for EEPROM programming - enabling self-timed byte and page writes without external timing control.

It operates exclusively as a slave device on the I²C bus, responding only to its fixed 7-bit client address (1010xxx) with R/W bit; A0–A2 pins are unconnected and may be left floating. Write protection is implemented via dedicated WP pin tied to VCC, disabling all write operations while preserving read functionality across the full 00h–FFh address space.

Key Specifications

Pinout & Package

24LC02BT-E/ST is supplied in an 8-lead SOIC package with wettable flanks (ST suffix), optimized for automated optical inspection (AOI) and solder joint reliability in high-reliability PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02BT-E/ST, the 24LC02B-I/ST sacrifices extended temperature capability for lower unit cost, while the AT24C02D-SSHM-T offers supply chain redundancy with functionally aligned - though not identical - AC timing behavior.

Availability

24LC02BT-E/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and IoT device identity management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC02BT-E/ST 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, manufacturing, and sales operations.

The 24LC02B family was designed specifically for reliable, low-power nonvolatile data storage in space-constrained embedded systems - emphasizing I²C simplicity, write-protection security, and extended-temperature robustness for automotive and industrial markets.

FAQ

What is the maximum I²C clock frequency supported by the 24LC02BT-E/ST?

The 24LC02BT-E/ST supports up to 400 kHz I²C clock frequency across its full 2.5V–5.5V supply range and −40°C to +125°C operating temperature. It does not support 1 MHz operation - that capability is exclusive to the 24FC02 variant. Timing compliance is verified per Table 1-2 in DS20001709N, including minimum THIGH (600 ns) and TLOW (1300 ns) requirements.

Can the A0, A1, and A2 pins of the 24LC02BT-E/ST be used to configure the I²C address?

No - the A0, A1, and A2 pins of the 24LC02BT-E/ST are not internally connected and have no effect on I²C addressing. The device uses a fixed 7-bit client address of 1010xxx (where xxx are "don't care" bits), resulting in eight possible addresses (0x50–0x57) that cannot be altered by external pin strapping. This is explicitly confirmed in Section 2.1 and Table 2-1 of DS20001709N.

How does the write-protect (WP) pin function on the 24LC02BT-E/ST?

When the WP pin of the 24LC02BT-E/ST is tied to VCC, all write operations (byte and page) to the entire 256-byte memory array are inhibited; read operations remain fully functional. When WP is tied to VSS (or left floating, though not recommended), normal read/write access is enabled. This hardware-level protection is active regardless of I²C command state and requires no software intervention.

Is the 24LC02BT-E/ST compatible with 1.8V I²C systems?

No - the 24LC02BT-E/ST requires a minimum VCC of 2.5V and is not rated for 1.8V operation. Attempting to operate below 2.5V may result in unreliable communication, incomplete writes, or data corruption. For 1.8V systems, consider the 24AA02 (1.7V–5.5V) or 24FC02 (1.7V–5.5V, 1 MHz) variants instead, as specified in the Device Selection Table on page 1 of DS20001709N.

What package type does the 'ST' suffix indicate for the 24LC02BT-E/ST?

The 'ST' suffix in 24LC02BT-E/ST denotes an 8-lead SOIC package with wettable flanks - a gull-wing lead profile featuring extended heel geometry to enable reliable automated optical inspection (AOI) of solder joints. This package variant is documented in Microchip's packaging specification C04-018-P Rev E and supports IPC-A-610 Class 2/3 assembly standards.