Microchip Technology 24LC01B-I/SN

Overview

24LC01B-I/SN from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 400 kHz max clock frequency, and operation from 2.5V to 5.5V. It supports page writes of up to 8 bytes and delivers ≤1 µA standby current at industrial temperature range (–40°C to +85°C), commonly used for configuration storage in embedded microcontroller systems.

For engineers reviewing the 24LC01B-I/SN datasheet, 24LC01B-I/SN pinout, 24LC01B-I/SN application, or 24LC01B-I/SN equivalent, key selection criteria include VCC min (2.5V), I²C bus compatibility (100/400 kHz), WP pin functionality, SOIC-8 package footprint, and endurance (>1 million cycles).

Technical Context

The 24LC01B-I/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 an 8-byte page write buffer, self-timed erase/write cycle, and address pointer logic enabling current-address, random, and sequential read modes.

Write protection is controlled solely by the WP pin: tied to VSS enables full read/write access to addresses 00h–7Fh; tied to VCC disables all write operations while preserving read capability. The device uses no internal connection for A0–A2 pins, allowing them to float or be tied high/low without functional impact.

Key Specifications

Pinout & Package

24LC01B-I/SN is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm body width, with gull-wing leads and JEDEC MS-012AC standard dimensions. Pin 1 is marked with a notch or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01-I/SN, 24LC01B-I/SN trades sub-2.5V operation for guaranteed AEC-Q100 compliance and tighter industrial temp stability; compared with 24LC01BT-I/SN, it offers identical silicon but different packaging format for hand-soldering or evaluation use.

Availability

24LC01B-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, consumer appliance configuration memory, and medical device parameter archiving requiring stable component supply, long-term data retention, and hardware write protection.

Supply support for 24LC01B-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products, with global design, manufacturing, and distribution infrastructure.

The 24LC01B belongs to Microchip's legacy 24XX01 EEPROM family, designed for cost-sensitive, low-power embedded systems needing reliable, I²C-accessible nonvolatile storage with minimal board space and BOM count.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC01B-I/SN?

The 24LC01B-I/SN requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Unlike the 24AA01 variant, it is not specified for operation below 2.5V - attempting to power it at 1.8V or 2.2V may result in undefined behavior or write failures. Always maintain VCC within 2.5V–5.5V per the datasheet DC characteristics table.

Does the 24LC01B-I/SN support 1 MHz I²C communication?

No, the 24LC01B-I/SN is rated for a maximum clock frequency of 400 kHz under all valid operating conditions. While some units may function at higher speeds in lab conditions, the datasheet explicitly specifies 400 kHz as the absolute maximum - exceeding this violates AC timing parameters (e.g., THIGH, TLOW) and risks data corruption. For 1 MHz I²C, consider the pin-compatible 24FC01 instead.

How does the WP pin affect memory access in the 24LC01B-I/SN?

When the WP pin of the 24LC01B-I/SN is tied to VCC, all write operations (byte and page) to the entire 128-byte memory array (addresses 00h–7Fh) are inhibited; reads remain fully functional. When WP is tied to VSS (or left floating, though not recommended), full read/write access is enabled. This hardware-level protection cannot be overridden by software commands.

Are the A0, A1, and A2 pins functional on the 24LC01B-I/SN?

No - the A0, A1, and A2 pins on the 24LC01B-I/SN have no internal connection and serve no functional purpose. They may be left unconnected, tied to VSS, or tied to VCC without affecting device operation or I²C addressing. The device uses a fixed 4-bit control code (1010) and ignores the three address bits, resulting in a single I²C slave address (0xA0 for write, 0xA1 for read).

What is the typical write cycle time for a full 8-byte page on the 24LC01B-I/SN?

The 24LC01B-I/SN has a maximum write cycle time of 5 ms for both single-byte and full 8-byte page writes. This is a self-timed internal operation - once the host issues a STOP condition after transmitting up to 8 bytes, the device initiates the erase-and-program sequence and will not acknowledge further I²C traffic until complete. ACK polling is the recommended method to detect completion without fixed delays.