Microchip Technology 24LC04B-I/SNG

Overview

24LC04B-I/SNG from Microchip Technology Inc. is a 4-Kbit I²C-compatible serial EEPROM organized as two 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 - used for nonvolatile parameter storage in embedded control modules.

For engineers reviewing the 24LC04B-I/SNG datasheet, 24LC04B-I/SNG pinout, 24LC04B-I/SNG application, or 24LC04B-I/SNG equivalent, key selection criteria include I²C voltage compatibility (2.5V min), industrial temperature range (-40°C to +85°C), 16-byte page write buffer, endurance (>1 million cycles), and package-specific pin mapping for SOIC-8 (SNG).

Technical Context

The 24LC04B-I/SNG implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. It supports standard-mode (100 kHz) and fast-mode (400 kHz) signaling, with internal address pointer auto-increment and ACK polling for write-cycle completion detection.

Memory access uses a 4-bit device code (1010) followed by block-select bit (B0) and R/W bit; no A0–A2 pins are internally connected. Page writes are limited to 16-byte boundaries within a single physical page, requiring software management to avoid wraparound.

Key Specifications

Pinout & Package

24LC04B-I/SNG is supplied in an 8-lead narrow SOIC package (SNG), with 1.27 mm pitch, 3.90 mm body width, and standard JEDEC MS-012AC footprint. Pin 1 is marked with a notch or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC04B-I/SNG, 24AA04-I/SNG extends low-voltage operation but retains identical packaging and interface behavior, while 24FC04-I/SNG delivers 2.5× faster clock support at full voltage range - both require no PCB changes but differ in supply and speed constraints.

Availability

24LC04B-I/SNG is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for 24LC04B-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, with global design and manufacturing operations.

The 24LC04B-I/SNG belongs to Microchip's legacy 24XX04 family of I²C EEPROMs, designed specifically for cost-sensitive, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC04B-I/SNG?

The 24LC04B-I/SNG requires a minimum V_CC of 2.5V for guaranteed operation across its full industrial temperature range (-40°C to +85°C). Unlike the 24AA04 or 24FC04 variants, it is not specified for operation below 2.5V - attempting to power the 24LC04B-I/SNG at 1.8V will result in undefined behavior or failure to respond on the I²C bus.

Does the 24LC04B-I/SNG support page writes, and what is the maximum number of bytes per page?

Yes, the 24LC04B-I/SNG supports page writes with a 16-byte buffer. Each page write operation can transfer up to 16 bytes in a single I²C transaction before the internal write cycle begins. Crossing a 16-byte page boundary causes wraparound within the same page - software must ensure address alignment to avoid unintended overwrites.

How does the Write-Protect (WP) pin function on the 24LC04B-I/SNG?

When the WP pin of the 24LC04B-I/SNG is tied to VCC, all write operations (byte and page) to the entire 4-Kbit memory array (addresses 000h–1FFh) are inhibited; read operations remain fully functional. Tying WP to VSS enables normal read/write access. This hardware-level protection operates independently of I²C commands and requires no firmware intervention.

Is the 24LC04B-I/SNG AEC-Q100 qualified, and for which grade?

Yes, the 24LC04B-I/SNG is AEC-Q100 qualified for Grade 3 (–40°C to +85°C), matching its industrial temperature rating. This qualification confirms reliability for automotive body electronics applications such as door modules, lighting controllers, and seat memory systems - verified through stress testing including HTOL, TC, and ESD.

What are the valid I²C device addresses for the 24LC04B-I/SNG?

The 24LC04B-I/SNG uses a fixed 4-bit device code of 1010b. Pins A0–A2 are not internally connected, so the full 7-bit slave address is always 1010XXXb, where the last three bits are "don't care." The block-select bit (B0) occupies bit 0 of the word address byte, not the device address - making the effective address space two independent 256-byte blocks.