Microchip Technology 24LC01BHT-I/LT

Overview

24LC01BHT-I/LT from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory, operating from 2.5V to 5.5V with industrial temperature range (−40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for half-array (0x40–0x7F). It supports byte and page writes (up to 8 bytes/page) and is used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 24LC01BHT-I/LT datasheet, 24LC01BHT-I/LT pinout, 24LC01BHT-I/LT application, or 24LC01BHT-I/LT equivalent, this page delivers verified electrical specs, validated SOT-23 pin mapping, confirmed half-array write-protection behavior, and real-world use cases in industrial control and automotive subsystems where low-voltage operation and >200-year data retention are critical.

Technical Context

The 24LC01BHT-I/LT implements a standard I²C slave interface with fixed 7-bit address prefix '1010' and three don't-care bits, enabling single-device bus placement without address conflicts. Its internal architecture includes an 8-byte page buffer, address pointer auto-increment logic, and Schmitt-triggered SDA/SCL inputs with 50 ns spike suppression.

Write protection is implemented via the WP pin: tied to VCC, it disables writes to addresses 0x40–0x7F while permitting full read access; tied to VSS, full read/write is enabled. The device uses on-chip charge pump for EEPROM programming and includes VCC threshold detection to inhibit writes below 1.5V.

Key Specifications

Pinout & Package

24LC01BHT-I/LT is packaged in a 5-lead SOT-23 surface-mount package (3.0 mm × 1.7 mm × 1.3 mm body height), optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01HT-I/LT and AT24C01D-SSHM-T, the 24LC01BHT-I/LT uniquely balances industrial temperature support, hardware write-protection, and ultra-compact SOT-23 packaging - making it optimal for space- and reliability-constrained embedded nodes where voltage never falls below 2.5V.

Availability

24LC01BHT-I/LT is available at Aetrix Electronics and suitable for industrial sensor calibration storage, automotive BCM configuration, medical device serial number logging, and smart energy meter firmware parameter backup requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.

Supply support for 24LC01BHT-I/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, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24LC01BHT-I/LT belongs to Microchip's 24LCxxB family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in cost-sensitive, space-constrained embedded systems across industrial, automotive, and consumer applications.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC01BHT-I/LT?

The 24LC01BHT-I/LT requires a minimum supply voltage of 2.5V for guaranteed functional operation across its full industrial temperature range (−40°C to +85°C). Operation below 2.5V is not specified and may result in incomplete writes, corrupted reads, or failure to acknowledge I²C transactions. The device includes an internal VCC threshold detector that inhibits write cycles when VCC drops below approximately 1.5V to prevent data corruption.

Does the 24LC01BHT-I/LT support standard I²C addressing, and what is its default slave address?

Yes, the 24LC01BHT-I/LT supports standard 7-bit I²C addressing with a fixed control code of '1010' (0xA) followed by three don't-care bits, resulting in a base slave address of 0x50 for write operations and 0x51 for read operations. Unlike higher-density variants, it does not use A0/A1/A2 pins for address extension - those pins are unconnected and may be left floating or tied to VSS/VCC without effect.

How does the hardware write-protect (WP) pin function on the 24LC01BHT-I/LT?

On the 24LC01BHT-I/LT, the WP pin enables hardware-level write protection for the upper half of memory (addresses 0x40–0x7F). When WP is tied to VCC, writes to that block are inhibited while reads remain fully functional; when WP is tied to VSS, full read/write access to all 128 bytes is enabled. This feature is implemented in silicon and requires no firmware intervention, providing robust protection against accidental or malicious overwrites.

What is the maximum supported I²C clock frequency for the 24LC01BHT-I/LT, and under what conditions?

The 24LC01BHT-I/LT supports a maximum I²C clock frequency of 400 kHz when VCC is 2.5V or higher. At VCC < 2.5V, the device is only rated for 100 kHz operation. This dual-speed capability is explicitly defined in the datasheet's AC characteristics table and must be observed in system-level timing budgeting - especially in mixed-voltage designs where VCC may vary during brown-out conditions.

Can the 24LC01BHT-I/LT be used in automotive applications requiring extended temperature range?

No, the 24LC01BHT-I/LT is qualified only for the industrial temperature range (−40°C to +85°C). For automotive applications requiring operation up to +125°C, Microchip offers the 24LC01BHE variant (e.g., 24LC01BHE-I/LT), which shares identical electrical and functional specifications but is tested and qualified across the extended −40°C to +125°C range. Using the 24LC01BHT-I/LT outside its rated temperature range voids parametric guarantees and may cause premature endurance degradation.