Microchip Technology 24LC02BHT-E/LT

Overview

24LC02BHT-E/LT from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protect for the upper half-array (80h–FFh), 5 ms max page write time, and operation from 2.5V to 5.5V across –40°C to +125°C. It supports 400 kHz clock frequency, features Schmitt-trigger inputs and slope-controlled outputs, and is used in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the 24LC02BHT-E/LT datasheet, 24LC02BHT-E/LT pinout, 24LC02BHT-E/LT application, or 24LC02BHT-E/LT equivalent, key selection criteria include extended temperature support (–40°C to +125°C), half-array hardware write-protection via WP pin, 8-byte page buffer capability, and compatibility with standard I²C bus timing at both 100 kHz and 400 kHz.

Technical Context

The 24LC02BHT-E/LT implements a two-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and page write modes. Its internal Address Pointer auto-increments during sequential reads and random access, enabling efficient block-level data retrieval without external address management.

Write protection is implemented via the WP pin: tied to VCC, it disables writes to addresses 80h–FFh while allowing full read access; tied to VSS, full read/write is enabled. The device uses an on-chip page buffer (8 bytes) and self-timed erase/write cycles, eliminating need for external timing control during programming.

Key Specifications

Pinout & Package

24LC02BHT-E/LT is supplied in an 8-lead TDFN (Thin Dual Flat No-lead) package with wettable flank leads, measuring 2 mm × 3 mm × 0.75 mm, optimized for space-constrained PCB layouts and automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-SSHM-T and BR24G02NUX-10, the 24LC02BHT-E/LT uniquely combines extended temperature operation (–40°C to +125°C), half-array hardware write-protection, and Microchip's AEC-Q100 qualification - making it the only option among the three suitable for automotive body electronics and high-reliability industrial edge nodes.

Availability

24LC02BHT-E/LT is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and smart meter firmware metadata storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24LC02BHT-E/LT 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, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.

The 24LC02BHT-E/LT belongs to Microchip's 24XX02H family of I²C EEPROMs, designed specifically for robust, low-power nonvolatile storage in space- and power-constrained embedded systems operating across harsh environmental conditions.

FAQ

What is the maximum clock frequency supported by the 24LC02BHT-E/LT?

The 24LC02BHT-E/LT supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher. At voltages below 2.5V, the maximum clock rate drops to 100 kHz. This dual-speed capability ensures interoperability with legacy 100 kHz systems while enabling faster parameter updates in modern 3.3V/5V designs. The 24LC02BHT-E/LT datasheet specifies timing parameters including THIGH, TLOW, and TSU:DAT for both speed grades.

How does the WP pin function on the 24LC02BHT-E/LT?

On the 24LC02BHT-E/LT, the WP (Write-Protect) pin enables hardware-based memory protection: when tied to VCC, writes to addresses 80h–FFh (upper 128 bytes) are inhibited while reads remain fully functional; when tied to VSS, full read/write access is granted. This allows secure storage of calibration data or firmware metadata independent of software control. The 24LC02BHT-E/LT does not require pull-up/pull-down resistors on A0–A2 pins, simplifying board layout.

Is the 24LC02BHT-E/LT compatible with standard I²C protocol?

Yes, the 24LC02BHT-E/LT is fully compliant with the standard two-wire I²C bus protocol, using a fixed 7-bit client address prefix of '1010' followed by three "don't care" bits and a R/W bit. It supports Start/Stop conditions, acknowledge polling during write cycles, and all three read modes (current address, random, and sequential). The 24LC02BHT-E/LT implements Schmitt-trigger inputs and slope-controlled outputs to ensure reliable operation on shared, noisy I²C buses.

What package type is used for the 24LC02BHT-E/LT?

The 24LC02BHT-E/LT is packaged in an 8-lead TDFN (Thin Dual Flat No-lead) with wettable flank leads, measuring 2 mm × 3 mm × 0.75 mm. This compact, leadless package supports high-density PCB layouts and enables automated optical inspection (AOI) of solder joints. The exposed pad may be connected to VSS or left floating per Microchip's packaging specification. The 'LT' suffix in the part number explicitly denotes this TDFN variant.

Does the 24LC02BHT-E/LT require external pull-up resistors on the I²C bus lines?

Yes, the 24LC02BHT-E/LT requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. For 400 kHz operation, a 2 kΩ pull-up to VCC is recommended; for 100 kHz, 10 kΩ is typical. These values ensure proper rise times per I²C specification while minimizing power consumption. The 24LC02BHT-E/LT's internal Schmitt-trigger inputs and output slope control help maintain signal integrity even with these external resistors in electrically noisy environments.