Microchip Technology 24LC02BH-I/SN

Overview

24LC02BH-I/SN 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 page writes of up to 8 bytes, and delivers ≤1 µA standby current - ideal for battery-backed real-time clock calibration storage in embedded sensor nodes.

For engineers reviewing the 24LC02BH-I/SN datasheet, 24LC02BH-I/SN pinout, 24LC02BH-I/SN application, or 24LC02BH-I/SN equivalent, key selection criteria include its half-array write-protection logic, Schmitt-triggered SDA/SCL inputs for noise immunity, 5 ms max page write time, and compatibility with standard I²C host controllers across 1.7–5.5 V supply ranges (with clock rate derating below 2.5 V).

Technical Context

The 24LC02BH-I/SN implements a two-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and page write modes with automatic internal erase/write timing. Its Address Pointer increments on each read/write, enabling sequential access across the full 256-byte array.

Write protection is implemented via the WP pin: tied to V_CC, it disables writes to addresses 0x80–0xFF while allowing full read access; tied to V_SS, full read/write capability is restored. A0–A2 pins are unconnected and may be left floating or tied to V_SS/V_CC without functional impact.

Key Specifications

Pinout & Package

24LC02BH-I/SN uses an 8-lead narrow SOIC (SN) package per Microchip drawing C04-057-SN Rev F, with 1.27 mm pitch, 3.90 mm body width, and gull-wing leads. Pin 1 is marked by a notch or dot; orientation follows standard SOIC conventions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02C-SSHM-T and ST24C02-WDT6-TR, the 24LC02BH-I/SN uniquely combines hardware-based half-array write protection, AEC-Q100 qualification, and >4 kV ESD tolerance - making it the preferred choice for safety-critical automotive and medical applications where physical write-locking and robustness are mandatory.

Availability

24LC02BH-I/SN is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration backup, and automotive body control unit NVM requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 24LC02BH-I/SN 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 and manufacturing operations.

The 24LC02BH belongs to Microchip's 24XX02H family of I²C EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space- and power-constrained embedded systems across industrial, automotive, and medical markets.

FAQ

What is the minimum V_CC required for 24LC02BH-I/SN operation?

The 24LC02BH-I/SN requires a minimum V_CC of 2.5 V for full functionality, including 400 kHz I²C operation. Below 2.5 V, the device is not specified - unlike the 24AA02H variant, which supports down to 1.7 V. This makes the 24LC02BH-I/SN appropriate for 3.3 V and 5 V systems but unsuitable for sub-2.5 V ultra-low-power designs.

How does the WP pin function on the 24LC02BH-I/SN?

On the 24LC02BH-I/SN, the WP pin provides hardware-level write protection: when tied to V_CC, writes to memory addresses 0x80–0xFF are inhibited while reads remain fully enabled; when tied to V_SS, full read/write access is restored. This physical lock prevents accidental or malicious overwrites of critical calibration or security data without requiring firmware intervention.

Can the 24LC02BH-I/SN be used in automotive applications?

Yes - the 24LC02BH-I/SN is AEC-Q100 qualified for automotive use and rated for the industrial temperature range (–40°C to +85°C). Its >4 kV ESD rating, 1 million endurance cycles, and hardware write-protect make it suitable for body control units, seat/mirror memory modules, and other non-safety-critical automotive subsystems requiring robust, long-life NVM.

What is the maximum page write time for the 24LC02BH-I/SN?

The maximum page write time for the 24LC02BH-I/SN is 5 ms, covering both single-byte and 8-byte page writes. During this internally timed cycle, the device does not acknowledge I²C commands - a condition detectable via acknowledge polling - ensuring predictable timing behavior for real-time firmware integration.

Are A0, A1, and A2 pins functional on the 24LC02BH-I/SN?

No - A0, A1, and A2 pins on the 24LC02BH-I/SN are not internally connected and serve no functional purpose. They may be left floating or tied to V_SS or V_CC without affecting device operation, addressing, or I²C communication. The device uses a fixed 7-bit client address (1010xxx) with the three least-significant bits treated as "don't care".