Microchip Technology 24LC02BH-E/ST

Overview

24LC02BH-E/ST from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with half-array hardware write-protection (80h–FFh), 1.7–5.5 V operation, and AEC-Q100 qualification for automotive use. It supports 400 kHz clock speed at V_CC ≥ 2.5 V, features Schmitt-trigger inputs, slope-controlled outputs, and 8-byte page write buffer.

For engineers reviewing the 24LC02BH-E/ST datasheet, 24LC02BH-E/ST pinout, 24LC02BH-E/ST application, or 24LC02BH-E/ST equivalent, key selection criteria include extended temperature support (–40°C to +125°C), I²C bus noise immunity, write-cycle timing (≤5 ms), endurance (>1 million cycles), and hardware-based memory protection for safety-critical firmware storage.

Technical Context

The 24LC02BH-E/ST 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 wraps on page boundary overflow.

It uses CMOS EEPROM array architecture with Y-decoder, X-decoder, sense amplifier, and memory control logic. Write protection is implemented via dedicated WP pin tied to V_CC to lock addresses 80h–FFh, while A0–A2 pins are unconnected and may be left floating or tied to V_SS/V_CC.

Key Specifications

Pinout & Package

24LC02BH-E/ST is supplied in an 8-lead SOIC package (SN), with standard 1.27 mm pitch and 3.90 mm body width. Pin 1 is marked with a notch or dot; package meets JEDEC MS-012 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02H-I/ST and AT24C02D-SSHM-T, the 24LC02BH-E/ST uniquely combines extended temperature support, AEC-Q100 qualification, and hardware-enforced half-array write protection - making it the only option for automotive and high-reliability industrial EEPROM use cases demanding both environmental robustness and data integrity assurance.

Availability

24LC02BH-E/ST is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor nodes, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24LC02BH-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products, with global design, manufacturing, and distribution infrastructure.

The 24LC02BH belongs to Microchip's serial EEPROM product line, designed specifically for automotive and industrial applications requiring high reliability, extended temperature operation, and hardware-level data protection.

FAQ

What is the minimum V_CC voltage required for reliable operation of the 24LC02BH-E/ST?

The 24LC02BH-E/ST requires a minimum V_CC of 2.5 V for guaranteed operation - unlike the 24AA02H variant which supports down to 1.7 V. Below 2.5 V, the device will not respond to I²C commands or execute write cycles. This threshold is strictly enforced per DS20002105B electrical specifications and applies across its full –40°C to +125°C operating range.

Does the 24LC02BH-E/ST support true 400 kHz I²C communication across its entire voltage and temperature range?

Yes - the 24LC02BH-E/ST supports 400 kHz clock frequency at V_CC ≥ 2.5 V and across its full extended temperature range (–40°C to +125°C). AC characteristics tables in DS20002105B confirm THIGH, TLOW, TR, and TF timing compliance at 400 kHz under these conditions, enabling high-speed configuration loading in automotive and industrial real-time systems.

How does the hardware write-protection feature work on the 24LC02BH-E/ST?

The 24LC02BH-E/ST uses the WP pin to enable hardware write-protection: when WP = V_CC, addresses 80h–FFh (128 bytes) are locked against write operations while remaining readable; when WP = V_SS, full 256-byte memory is writable. This is implemented at silicon level - no firmware involvement required - and remains active during power cycling.

Are the A0, A1, and A2 pins functional on the 24LC02BH-E/ST?

No - the A0, A1, and A2 pins on the 24LC02BH-E/ST are not internally connected and serve no functional purpose. They may be left floating or tied to V_SS/V_CC without affecting device behavior, I²C address (fixed at 1010xxx), or electrical performance. This simplifies PCB layout and eliminates external address-select resistors.

What is the maximum write cycle time for the 24LC02BH-E/ST, and how should hosts manage it?

The maximum write cycle time for the 24LC02BH-E/ST is 5 ms for both byte and page writes. Hosts must either wait this duration after issuing a Stop condition or use acknowledge polling: repeatedly send a Start + control byte (R/W = 0) until the device responds with ACK, indicating write completion. This method maximizes I²C bus utilization and avoids fixed delays.