Microchip Technology 24LC08B/SN

Overview

24LC08B/SN from Microchip Technology Inc. is an 8-Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit blocks, operating from 2.5V to 5.5V with 400 kHz max clock frequency, 1 µA standby current, and hardware write-protection via the WP pin. It supports industrial (–40°C to +85°C) and extended (–40°C to +125°C) temperature ranges in 8-lead SOIC (SN) package and is used for configuration storage in embedded controllers and sensor modules.

For engineers reviewing the 24LC08B/SN datasheet, 24LC08B/SN pinout, 24LC08B/SN application, or 24LC08B/SN equivalent, this page delivers verified electrical specs, I²C timing constraints, WP-enabled memory protection behavior, and SOIC-8 package layout - all confirmed for the exact 24LC08B/SN variant per Microchip DS20001710M.

Technical Context

The 24LC08B/SN implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes a 16-byte page write buffer, self-timed erase/write cycle, and address pointer logic supporting current-address, random, and sequential read modes.

It uses a fixed 4-bit device identifier (1010b) with 2-bit block select (B1/B0) and R/W bit for addressing four 256-word memory blocks. Write protection is implemented via external WP pin logic: tied to VSS enables full read/write; tied to VCC disables all writes while preserving reads.

Key Specifications

Pinout & Package

24LC08B/SN is supplied in 8-lead narrow-body SOIC (JEDEC MS-012, package code SN), 3.90 mm body width, with gull-wing leads and Pin 1 index notch. Exposed pad is absent; no thermal pad connection required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC08B/SN, the 24AA08-I/SN extends low-voltage operation but sacrifices high-speed performance, while the 24FC08-I/SN doubles clock rate at the cost of tighter AC timing margins - both retain identical SOIC-8 footprint and I²C protocol behavior.

Availability

24LC08B/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply, long-term data retention, and AEC-Q100-aligned reliability.

Supply support for 24LC08B/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24LC08B belongs to Microchip's 24XX08 family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile storage in space-constrained embedded systems across industrial, automotive, and medical markets.

FAQ

What is the minimum operating voltage for 24LC08B/SN?

The 24LC08B/SN requires a minimum VCC of 2.5V, as specified in the Device Selection Table and Electrical Characteristics section of DS20001710M. Operation below 2.5V is not guaranteed and may result in unreliable read/write behavior or failure to acknowledge I²C transactions. This distinguishes it from the 24AA08 (1.7V min) and 24FC08 (1.7V min) variants in the same family.

Does 24LC08B/SN support 1 MHz I²C communication?

No, 24LC08B/SN is rated for a maximum clock frequency of 400 kHz across its full VCC range (2.5V–5.5V). The 1 MHz rating applies only to the 24FC08 variant. Attempting 1 MHz operation with 24LC08B/SN will violate AC timing specifications - particularly THIGH (min 600 ns) and TLOW (min 1300 ns) - leading to communication failures.

How does the WP pin function on 24LC08B/SN?

On 24LC08B/SN, the WP pin is a dedicated hardware write-protect input: when tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional; when tied to VSS, full read/write access is enabled. The pin must be driven to a valid logic level - floating or high-impedance states are undefined per DS20001710M Section 2.4.

What is the memory organization of 24LC08B/SN?

The 24LC08B/SN contains 8 Kbits (1024 bytes) of EEPROM organized as four independent 256 × 8-bit blocks (000h–0FFh, 100h–1FFh, 200h–2FFh, 300h–3FFh). Block selection is controlled by B1/B0 bits in the I²C control byte, enabling deterministic addressing without software-managed bank switching.

Is 24LC08B/SN qualified for automotive applications?

Yes, 24LC08B/SN is explicitly qualified to AEC-Q100 Grade 3 (–40°C to +125°C) per the Device Selection Table and Features list in DS20001710M. This qualification covers stress testing for temperature cycling, humidity, ESD (>4 kV), and mechanical shock - making it suitable for body electronics, infotainment, and ADAS subsystems where extended temperature operation is required.