Microchip Technology 24LC01BHT-E/LT

Overview

24LC01BHT-E/LT from Microchip Technology Inc. is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM designed for low-voltage embedded system memory storage. It operates from 2.5V to 5.5V, supports up to 400 kHz I²C clock frequency, features hardware write-protection for the upper half-array (40h–7Fh), and delivers 1 μA max standby current and >1 million erase/write cycles. It is used in industrial sensor calibration data retention and firmware parameter storage where space-constrained 5-lead SOT-23 packaging is required.

For engineers reviewing the 24LC01BHT-E/LT datasheet, 24LC01BHT-E/LT pinout, 24LC01BHT-E/LT application, or 24LC01BHT-E/LT equivalent, this page provides verified electrical specifications, validated SOT-23 pin mapping, confirmed half-array write-protect behavior, and real-world use cases in automotive-grade temperature logging and factory-programmable configuration storage.

Technical Context

The 24LC01BHT-E/LT implements a true 2-wire I²C slave interface with fixed 7-bit address prefix '1010' and three don't-care bits, enabling single-device bus operation without address conflicts. Its internal architecture includes an 8-byte page buffer, Schmitt-triggered SDA/SCL inputs for noise immunity, and slope-controlled outputs to suppress ground bounce during switching.

Write protection is implemented via the WP pin: tied to VCC, it disables writes to addresses 40h–7Fh while permitting full read access; tied to VSS, full read/write capability is restored. The device uses on-chip charge-pump voltage generation to support EEPROM programming at VCC ≥ 2.5V, with automatic VCC threshold detection disabling writes below 1.5V.

Key Specifications

Pinout & Package

24LC01BHT-E/LT is supplied in a 5-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and Pb-free matte tin plating. Pin 1 is marked by a dot; orientation follows standard SOT-23 top view with lead 1 at top-left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BHT-E/LT, the 24AA01HT-I/LT trades automotive temperature range for lower-voltage operation, while the AT24C01D-SSHM-T offers faster I²C but removes hardware write protection-making 24LC01BHT-E/LT the only option combining AEC-Q200 compliance, dedicated WP, and SOT-23-5 footprint.

Availability

24LC01BHT-E/LT is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and smart meter firmware flag storage requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC01BHT-E/LT 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving industrial, automotive, consumer, and communications markets with vertically integrated silicon and development tools.

The 24LC01BHT-E/LT belongs to Microchip's 24LCxxB serial EEPROM family, engineered for robust, low-power, I²C-based nonvolatile storage in space- and reliability-constrained embedded systems requiring AEC-Q200 qualification.

FAQ

What is the minimum VCC required for reliable operation of the 24LC01BHT-E/LT?

The 24LC01BHT-E/LT requires a minimum VCC of 2.5V for guaranteed functionality across its full temperature range. Operation below 2.5V is not supported - unlike the 24AA01H variant, which operates down to 1.7V. This 2.5V threshold ensures proper charge-pump operation for EEPROM writes and stable I²C communication at 400 kHz. The device includes internal VCC monitoring that disables write operations if supply drops below 1.5V during programming.

How does the WP pin function on the 24LC01BHT-E/LT?

On the 24LC01BHT-E/LT, the WP (Write-Protect) pin enables hardware-level memory protection: when tied to VCC, writes to addresses 40h–7Fh (upper 64 bytes) are inhibited while reads remain fully functional; when tied to VSS, full read/write access to the entire 128-byte array is enabled. Unlike software-based locks, this protection persists through power cycles and cannot be overridden by I²C commands - making it ideal for safeguarding calibration data or security keys.

What package type and dimensions does the 24LC01BHT-E/LT use?

The 24LC01BHT-E/LT uses a 5-lead SOT-23 package (JEDEC MO-178AA) with dimensions of 2.9 mm × 1.6 mm × 1.1 mm and gull-wing leads. Pin 1 is marked by a dot; the pinout is SCL–VSS–SDA–WP–VCC (top view, left-to-right). This compact footprint supports high-density PCB layouts in space-constrained applications such as automotive ECUs and wearable IoT sensors.

Does the 24LC01BHT-E/LT support page writes, and what is the page size?

Yes, the 24LC01BHT-E/LT supports page writes with an 8-byte page buffer. Up to 8 sequential bytes can be loaded into the buffer and written to memory with a single Stop condition, reducing I²C transaction overhead. Page boundaries align to 8-byte intervals (e.g., 00h–07h, 08h–0Fh); crossing a boundary causes wraparound within the current page - so software must ensure address alignment before initiating multi-byte writes.

What is the endurance and data retention specification for the 24LC01BHT-E/LT?

The 24LC01BHT-E/LT guarantees 1 million erase/write cycles per memory location and 200 years of data retention at +25°C. These values are characterized per JEDEC standards and apply across the full automotive temperature range (-40°C to +125°C), with retention degrading predictably at elevated temperatures - e.g., ~100 years at +85°C. Endurance is measured under worst-case conditions (VCC = 5.5V, TA = 25°C) and remains valid for typical field usage profiles.