Microchip Technology 24LC01BT-I/ST

Overview

24LC01BT-I/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 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 is rated for -40°C to +85°C industrial use in embedded control and sensor calibration storage.

For engineers reviewing the 24LC01BT-I/ST datasheet, 24LC01BT-I/ST pinout, 24LC01BT-I/ST application, or 24LC01BT-I/ST equivalent, this page provides verified package mapping (SOIC-8), confirmed I²C timing compliance (THD:STA ≥600 ns, TAA ≤900 ns at 2.5–5.5V), endurance (1M cycles), data retention (>200 years), and WP-controlled full-array protection - all validated per DS20001711M.

Technical Context

The 24LC01BT-I/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 write buffer allows burst writes within a single physical page boundary (00–07, 08–0F, ..., 78–7F).

Write protection is implemented via the dedicated WP pin: tied to VSS for full read/write access, tied to VCC to inhibit all writes across the entire 128-byte array (00–7F). The device uses an on-chip HV generator for EEPROM programming and features acknowledge polling to detect write cycle completion without fixed delay timing.

Key Specifications

Pinout & Package

24LC01BT-I/ST is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm body width, with gull-wing leads and standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BT-I/ST, the 24AA01T-I/ST enables lower-voltage operation but sacrifices guaranteed 400 kHz performance below 2.5V, while the AT24C01D-SSHM-T offers higher speed and automotive qualification but requires I²C address reconfiguration in existing firmware.

Availability

24LC01BT-I/ST is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, consumer appliance firmware storage, and sensor calibration applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 24LC01BT-I/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 design and manufacturing operations.

The 24LC01B family is designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage of configuration data, calibration values, and user settings - optimized for I²C bus integration and industrial temperature resilience.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC01BT-I/ST?

The 24LC01BT-I/ST requires a minimum supply voltage of 2.5V for guaranteed operation across its full specification, including 400 kHz I²C timing and 1 µA standby current. Unlike the 24AA01 variant, it is not rated for operation below 2.5V - attempting to power it at 1.8V or 2.2V may result in undefined behavior, failed writes, or timing violations per DS20001711M Section 1.0.

Does the 24LC01BT-I/ST support page write operations, and what is the maximum number of bytes per page?

Yes, the 24LC01BT-I/ST supports page write operations with an 8-byte page buffer. Each page spans contiguous addresses (e.g., 00–07, 08–0F), and writing across a page boundary causes wraparound within that page - not sequential advancement. This behavior is documented in DS20001711M Figure 6-2 and Section 6.2, requiring firmware to align multi-byte writes to page boundaries for predictable storage.

How does the Write-Protect (WP) pin function on the 24LC01BT-I/ST, and what happens when it is tied to VCC?

When the WP pin of the 24LC01BT-I/ST is tied to VCC, all write operations (byte and page) to the entire 128-byte memory array (addresses 00–7F) are inhibited; read operations remain fully functional. This hardware-level protection is active immediately and cannot be overridden by software commands - a key safety feature for preserving calibration data or firmware configuration during system updates.

Is the 24LC01BT-I/ST pin-compatible with other members of the 24XX01 family, such as the 24AA01 or 24FC01?

Yes, the 24LC01BT-I/ST shares identical pinout and SOIC-8 package dimensions with 24AA01T-I/ST and 24FC01T-I/ST, as confirmed in DS20001711M Table 2-1 and Package Types section. However, electrical differences exist: VCC range (2.5–5.5V vs. 1.7–5.5V), max clock (400 kHz vs. 1 MHz), and temperature grading - so direct substitution requires validation of voltage, speed, and thermal requirements.

What is the endurance rating and data retention specification for the 24LC01BT-I/ST?

The 24LC01BT-I/ST is specified for more than 1,000,000 erase/write cycles and greater than 200 years of data retention at 25°C, as stated in the Features section and Table 1-2 of DS20001711M. These values are characterized and ensured by Microchip's process and testing methodology - not estimated or extrapolated - making it suitable for mission-critical, long-lifecycle deployments.