Microchip Technology 24LC01BT/ST

Overview

24LC01BT/ST from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 8-byte page write buffer, and operation down to 2.5V. It supports 400 kHz clock frequency, delivers ≤1 mA active current and ≤1 µA standby current (I-temp), and targets nonvolatile data storage in space-constrained embedded systems.

For engineers reviewing the 24LC01BT/ST datasheet, 24LC01BT/ST pinout, 24LC01BT/ST application, or 24LC01BT/ST equivalent, this page provides verified specifications, SOIC-8 pin mapping, industrial temperature support (–40°C to +85°C), RoHS-compliant packaging, and direct alternatives for legacy design refresh or supply continuity planning.

Technical Context

The 24LC01BT/ST implements a 2-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while the 8-byte page buffer allows efficient multi-byte writes within a single physical page boundary (00–07, 08–0F, ..., 78–7F).

Write protection is controlled exclusively via the WP pin: tied to VSS for full read/write access, or to VCC to inhibit all write operations across the entire 128-byte array. The device uses self-timed erase/write cycles with a maximum 5 ms write cycle time and supports >1 million endurance cycles with >200 years of data retention.

Key Specifications

Pinout & Package

24LC01BT/ST is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with 150 mil body width and gull-wing leads. Pin 1 is marked by a beveled corner or notch on the package top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BT/ST, the 24AA01T/ST extends low-voltage operation but shares identical timing and pin compatibility, while the AT24C01D-SSHM-T adds automotive qualification without altering basic EEPROM behavior-making both viable for drop-in replacement where voltage or reliability requirements shift.

Availability

24LC01BT/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer remote control ID storage, and medical diagnostic device settings requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for 24LC01BT/ST 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 manufacturing and support infrastructure.

The 24LC01B series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring simple, robust, and low-power nonvolatile storage.

FAQ

What is the minimum operating voltage for the 24LC01BT/ST?

The 24LC01BT/ST requires a minimum V_CC of 2.5V and is not specified for operation below that level. Unlike the 24AA01 or 24FC01 variants, it lacks 1.7V compatibility. Operating below 2.5V may result in unreliable reads, failed writes, or undefined I²C acknowledgment behavior. Always maintain V_CC ≥2.5V across the full industrial temperature range.

Does the 24LC01BT/ST support 1 MHz I²C clock speed?

No, the 24LC01BT/ST is rated for a maximum clock frequency of 400 kHz under all valid operating conditions. It does not support fast-mode (1 MHz) I²C. Attempting 1 MHz operation will violate AC timing parameters-including THIGH, TLOW, and TSU:DAT-and cause communication failures. For 1 MHz support, consider the 24FC01 family instead.

How does the WP pin function on the 24LC01BT/ST?

On the 24LC01BT/ST, the WP pin is a hardwired enable: when tied to VCC, the entire 128-byte memory array (addresses 00–7F) is write-protected and rejects all write commands; when tied to VSS, full read/write access is enabled. No internal pull-up/down is present, so the pin must be actively driven-floating is not recommended for deterministic behavior.

Can the 24LC01BT/ST be used in automotive applications?

The 24LC01BT/ST is qualified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 certified. While it may function in some automotive environments, Microchip does not guarantee performance or reliability under automotive stress profiles (e.g., extended temperature cycling, vibration, or ESD). For automotive use, select the AEC-Q100–qualified AT24C01D-SSHM-T or equivalent.

What happens if a page write crosses a physical page boundary on the 24LC01BT/ST?

If a page write command attempts to write across a physical page boundary (e.g., writing 9 bytes starting at address 0x07), the 24LC01BT/ST wraps the excess data back to the start of the same page (0x00), overwriting previously loaded bytes. This occurs because the internal address pointer rolls over within the 8-byte page window. Application firmware must enforce page-aligned writes to avoid unintended data corruption.