Microchip Technology 24LC02B-I/SNG

Overview

24LC02B-I/SNG 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, 2.5V–5.5V supply range, and industrial temperature rating (–40°C to +85°C). It supports page writes up to 8 bytes and is commonly used for storing calibration data, configuration settings, or device identifiers in embedded microcontroller systems.

For engineers reviewing the 24LC02B-I/SNG datasheet, 24LC02B-I/SNG pinout, 24LC02B-I/SNG application, or 24LC02B-I/SNG equivalent, key selection considerations include its 2.5V minimum VCC, WP-enabled hardware lockout, Schmitt-triggered I²C inputs for noise immunity, and compatibility with standard I²C bus timing at 400 kHz under industrial conditions.

Technical Context

The 24LC02B-I/SNG implements a two-wire I²C interface with fixed 7-bit client address (1010xxx), where the three least-significant bits are "don't care" - enabling single-device addressing without external address pins. Its internal Address Pointer auto-increments during sequential reads and supports current-address, random, and sequential read modes.

Write operations use self-timed erase/write cycles with 5 ms maximum duration; page writes buffer up to 8 bytes before initiating the internal programming cycle. Acknowledge polling is supported to detect write completion, and the WP pin provides hardware-level protection of the full 256-byte array when tied to VCC.

Key Specifications

Pinout & Package

24LC02B-I/SNG is supplied in an 8-lead SOIC package (SNG suffix per Microchip's packaging table). Pin functions are standardized across all 24XX02 variants and verified in DS20001709N, Table 2-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02B-I/SNG, the 24AA02-I/SN enables lower-voltage operation but sacrifices automotive qualification, while the AT24C02D-SSHM-T offers identical electrical and functional performance with alternate packaging and marking - making it ideal for supply chain diversification without design change.

Availability

24LC02B-I/SNG is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration backup, and medical device serialization requiring stable component supply across extended production lifecycles.

Supply support for 24LC02B-I/SNG 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.

The 24LC02B belongs to Microchip's legacy 24XX02 EEPROM family, designed specifically for cost-sensitive, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components and robust I²C interoperability.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC02B-I/SNG?

The 24LC02B-I/SNG requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Operation below 2.5V is not specified and may result in unreliable I²C communication or incomplete write cycles. This distinguishes it from the 24AA02 (1.7V min) and 24FC02 (1.7V min, 1 MHz capable) variants in the same family. Always verify VCC stability during brown-out conditions in your 24LC02B-I/SNG design.

Does the 24LC02B-I/SNG support multi-master I²C bus configurations?

Yes, the 24LC02B-I/SNG fully supports multi-master I²C buses as defined by the NXP I²C specification. Its open-drain SDA/SCL pins, built-in arbitration detection, and clock stretching capability (via acknowledge polling during writes) ensure safe coexistence with other masters. No additional hardware or protocol modifications are needed - the 24LC02B-I/SNG behaves as a standard I²C slave responding only to its fixed 7-bit address (1010xxx).

How does hardware write-protection work on the 24LC02B-I/SNG?

Hardware write-protection on the 24LC02B-I/SNG is controlled exclusively by the WP pin: when tied to VCC, all write operations (byte and page) to the entire 256-byte memory array are inhibited, while read operations remain fully functional. When WP is tied to VSS or left floating, normal read/write access is enabled. This is a physical-level lock - no software command or I²C transaction can override it, making the 24LC02B-I/SNG suitable for protecting critical firmware or calibration data.

Can the 24LC02B-I/SNG be used in automotive applications?

Yes - the 24LC02B-I/SNG is AEC-Q100 qualified for automotive applications, specifically meeting Grade 3 requirements (–40°C to +85°C ambient). Its qualification covers stress testing for temperature cycling, humidity, ESD (>4 kV), and mechanical shock. However, note that only the "I" and "E" temperature grades are AEC-Q100 qualified; the "I/SNG" suffix denotes Industrial grade and is certified accordingly. Always confirm qualification status using Microchip's official PPAP documentation for your specific lot.

What is the maximum page write size supported by the 24LC02B-I/SNG?

The 24LC02B-I/SNG supports a maximum page write size of 8 bytes. Page boundaries align to integer multiples of 8 (addresses 0x00–0x07, 0x08–0x0F, etc.), and attempting to cross a boundary causes wraparound within the current page - not continuation into the next. To avoid data corruption, application firmware must split multi-byte writes spanning page boundaries. This 8-byte limit is fixed in silicon and cannot be modified via configuration registers or external circuitry.