Microchip Technology 24LC02B-E/SN

Overview

24LC02B-E/SN from Microchip Technology Inc. is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protection, 400 kHz max clock frequency, and operation from 2.5V to 5.5V. It supports page writes (up to 8 bytes), delivers ≤1 µA standby current at industrial/extended temperature ranges (–40°C to +125°C), and is used for storing calibration data, configuration settings, and device identifiers in embedded control systems.

For engineers reviewing the 24LC02B-E/SN datasheet, 24LC02B-E/SN pinout, 24LC02B-E/SN application, or 24LC02B-E/SN equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), I²C timing compliance at 400 kHz, WP pin functionality for hardware-level write protection, and package-specific thermal and layout constraints for SOIC-8 (SN) mounting.

Technical Context

The 24LC02B-E/SN 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 sequential, random, and current-address read modes, while the 8-byte page buffer supports efficient multi-byte writes without host intervention between bytes.

Write operations are self-timed (max 5 ms), and acknowledge polling allows bus-efficient detection of write completion. The device uses no internal connections for A0–A2 pins - they are NC and may be left floating or tied to VSS/VCC - simplifying PCB routing and reducing external component count in space-constrained designs.

Key Specifications

Pinout & Package

24LC02B-E/SN is supplied in an 8-lead SOIC package (SN suffix), with 1.27 mm pitch, 3.9 mm body width, and JEDEC MS-012AC compliant footprint. Pin 1 is marked with a notch or dot; orientation follows standard SOIC top-view labeling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02B-E/SN, the 24AA02-I/SN trades extended temperature support for broader voltage flexibility, while the AT24C02C-SSHM-T sacrifices automotive qualification for higher I²C bandwidth - making each suitable only when their specific trade-offs align with system-level constraints.

Availability

24LC02B-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and medical device parameter storage requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for 24LC02B-E/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 24LC02B belongs to Microchip's 24XX02 family of I²C EEPROMs, designed specifically for reliable, low-power, and pin-compatible nonvolatile storage in space- and power-constrained embedded systems across automotive, industrial, and medical markets.

FAQ

What is the maximum I²C clock frequency supported by the 24LC02B-E/SN?

The 24LC02B-E/SN supports up to 400 kHz I²C clock frequency when VCC is 2.5V or higher. At voltages below 2.5V, it is not rated for operation - unlike the 24AA02, which supports 100 kHz down to 1.7V. This makes the 24LC02B-E/SN appropriate for 3.3V and 5V systems but incompatible with 1.8V I²C buses without level shifting.

Does the 24LC02B-E/SN require external pull-up resistors on SDA and SCL lines?

Yes, the 24LC02B-E/SN requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values are 2 kΩ for 400 kHz operation and 10 kΩ for 100 kHz. Pull-up voltage must match the VCC rail (2.5–5.5V), and resistor placement should minimize trace capacitance to meet rise-time specifications.

How does the Write-Protect (WP) pin function on the 24LC02B-E/SN?

When the WP pin of the 24LC02B-E/SN is tied to VCC, the entire memory array (addresses 00h–FFh) is write-protected - all write and page-write commands are ignored, though reads remain fully functional. When tied to VSS (or left floating, per datasheet), normal read/write operation is enabled. This hardware lock operates independently of software state.

Can the 24LC02B-E/SN be used in automotive applications?

Yes, the 24LC02B-E/SN is AEC-Q100 qualified for Extended temperature range (–40°C to +125°C) and is explicitly approved for automotive applications including engine control units, body electronics, and ADAS subsystems. Its qualification covers stress testing for thermal cycling, humidity, and electrical robustness required by automotive OEMs.

What is the purpose of the A0, A1, and A2 pins on the 24LC02B-E/SN?

The A0, A1, and A2 pins on the 24LC02B-E/SN are not connected internally (NC). They serve no functional role in addressing or operation and may be left floating, tied to VSS, or tied to VCC without affecting device behavior - simplifying PCB layout and eliminating the need for external address-select resistors.