Microchip Technology 24LC02BHT-I/MS

Overview

24LC02BHT-I/MS 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), 400 kHz max clock frequency at V_CC ≥ 2.5 V, and industrial temperature range (–40°C to +85°C). It operates down to 2.5 V, supports 8-byte page writes with ≤5 ms self-timed erase/write cycle, and is packaged in an 8-lead MSOP.

For engineers reviewing the 24LC02BHT-I/MS datasheet, 24LC02BHT-I/MS pinout, 24LC02BHT-I/MS application, or 24LC02BHT-I/MS equivalent, key selection criteria include V_CC compatibility (2.5–5.5 V), half-array write-protection behavior, I²C timing compliance at 400 kHz, MSOP package footprint, and endurance (>1 million cycles) for embedded configuration storage.

Technical Context

The 24LC02BHT-I/MS implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while acknowledge polling allows host-driven write-cycle completion detection without fixed delays.

Write protection is implemented via the WP pin: tied to V_SS, full array access is enabled; tied to V_CC, addresses 80h–FFh are write-inhibited while reads remain functional. The device uses no internal connection for A0–A2 pins-these may be left floating or tied to V_SS/V_CC with no functional impact.

Key Specifications

Pinout & Package

8-Lead MSOP (Micro Small Outline Package) with 0.65 mm pitch, 3.0 mm × 3.0 mm body, and exposed pad optionally connected to V_SS. Pin 1 is marked by notch or dot; pin numbering follows standard MSOP convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02BHT-I/MS, the 24LC02BT-I/SN offers identical electrical behavior in a larger SOIC package ideal for prototyping, while AT24C02D-SSHM-T extends voltage range and speed but replaces hardware write-protection with software-configurable lock bits - impacting security-critical configuration storage.

Availability

24LC02BHT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration, smart meter firmware metadata, and automotive ECU parameter backup requiring stable component supply and long-term obsolescence management.

Supply support for 24LC02BHT-I/MS 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 24LC02BHT-I/MS belongs to Microchip's 24XX02H family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space-constrained industrial, automotive, and consumer applications where hardware write-protection and extended temperature operation are critical.

FAQ

What is the minimum V_CC required for reliable operation of the 24LC02BHT-I/MS?

The 24LC02BHT-I/MS requires a minimum V_CC of 2.5 V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Operation below 2.5 V is not specified and may result in incomplete write cycles or communication failures. This distinguishes it from the 24AA02H variant, which supports down to 1.7 V.

How does the WP pin function on the 24LC02BHT-I/MS, and what happens when it is tied to V_CC?

When the WP pin of the 24LC02BHT-I/MS is tied to V_CC, write operations to memory addresses 80h–FFh (upper 128 bytes) are inhibited; reads remain fully functional. Addresses 00h–7Fh remain writable. Tying WP to V_SS enables full-array write access. This hardware-level protection is active immediately and requires no software configuration.

Can the A0, A1, and A2 pins of the 24LC02BHT-I/MS be left unconnected, and do they affect I²C addressing?

Yes, the A0, A1, and A2 pins of the 24LC02BHT-I/MS are not internally connected and may be left floating or tied to V_SS/V_CC with no functional impact. The device uses a fixed 4-bit I²C client address prefix '1010', and the three address bits are "don't care" - so the 24LC02BHT-I/MS always responds to control byte 1010xxx0 (write) or 1010xxx1 (read), regardless of A0–A2 state.

What is the maximum write cycle time for a page write operation on the 24LC02BHT-I/MS?

The maximum write cycle time for any write operation - whether single-byte or 8-byte page write - is 5 ms for the 24LC02BHT-I/MS. During this time, the device does not acknowledge I²C commands. Hosts must use acknowledge polling (repeated START + control byte with R/W=0) or fixed 5 ms delay to determine write completion before initiating subsequent operations.

Is the 24LC02BHT-I/MS qualified for automotive applications, and what standards does it meet?

Yes, the 24LC02BHT-I/MS is AEC-Q100 qualified for automotive applications. It meets Grade 2 temperature requirements (–40°C to +105°C) and is rated for industrial temperature range (–40°C to +85°C) per its I-temp designation. Its ESD protection (>4 kV), 1 million endurance cycles, and >200-year data retention support deployment in automotive ECUs, infotainment systems, and ADAS modules requiring long-term reliability.