Microchip Technology 24LC01BH-E/MS

Overview

24LC01BH-E/MS 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 and automotive temperature range support (–40°C to +125°C), 400 kHz max clock frequency, and hardware write-protect for half-array (40h–7Fh). It serves as nonvolatile configuration storage in embedded control modules requiring robust data retention.

For engineers reviewing the 24LC01BH-E/MS datasheet, 24LC01BH-E/MS pinout, 24LC01BH-E/MS application, or 24LC01BH-E/MS equivalent, key selection considerations include VCC minimum (2.5V), WP-enabled half-array protection, MSOP-8 package footprint, and I²C timing compliance at 400 kHz under automotive thermal conditions.

Technical Context

The 24LC01BH-E/MS implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer supports current-address, random, and sequential read modes, while page write capability allows up to 8 bytes per write cycle with 3 ms typical completion time.

Write protection is controlled solely by the WP pin: tied to VCC, it disables writes to addresses 40h–7Fh; tied to VSS, full array access is enabled. The device features an internal voltage threshold detector that disables erase/write logic below 1.5V, ensuring data integrity during brown-out conditions.

Key Specifications

Pinout & Package

24LC01BH-E/MS is supplied in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm lead pitch and 3.0 mm × 3.0 mm body size, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BH-E/MS, the 24AA01HT-I/MS trades automotive temperature range for lower-voltage operation, while the AT24C01D-SSHM-T adds write-cycle suspend and higher ESD tolerance-both require validation of WP pin behavior and page-write boundary handling in existing firmware.

Availability

24LC01BH-E/MS is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, medical infusion pumps, and smart energy metering requiring stable component supply across extended temperature and long lifecycle commitments.

Supply support for 24LC01BH-E/MS 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 company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including AEC-Q100 for automotive components.

The 24LC01BH belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in automotive and industrial control systems where data integrity under thermal stress and electrical noise is critical.

FAQ

What is the minimum VCC voltage required for reliable operation of the 24LC01BH-E/MS?

The 24LC01BH-E/MS requires a minimum VCC of 2.5V for guaranteed operation across its full temperature range (–40°C to +125°C). Operation below 2.5V is not specified and may result in failed writes or corrupted reads. This distinguishes it from the 24AA01H variant, which supports down to 1.7V. The internal voltage detector disables write logic if VCC falls below ~1.5V, preventing partial writes.

How does the WP pin function on the 24LC01BH-E/MS, and what memory regions does it protect?

On the 24LC01BH-E/MS, the WP pin enables hardware-based write protection: when tied to VCC, writes to memory addresses 40h–7Fh (64 bytes, upper half of the 128-byte array) are inhibited, while reads remain fully functional. When tied to VSS, full-array write access is enabled. Addresses 00h–3Fh remain writable regardless of WP state. This partitioning supports safe storage of immutable calibration data alongside modifiable runtime parameters.

Can the 24LC01BH-E/MS be used in 100 kHz I²C systems, and what are the timing implications?

Yes, the 24LC01BH-E/MS supports 100 kHz I²C operation, but only when VCC is below 2.5V - a condition not permitted for this part. Since the 24LC01BH-E/MS has a 2.5V minimum VCC, it operates exclusively at up to 400 kHz. Its AC specifications (e.g., THIGH ≥600 ns, TLOW ≥1300 ns) are guaranteed for 2.5V–5.5V, making it incompatible with legacy 100 kHz-only buses that rely on longer timing margins.

What is the page size and maximum burst write length supported by the 24LC01BH-E/MS?

The 24LC01BH-E/MS supports page writes of up to 8 bytes per transaction. Its physical page size is 8 bytes, with boundaries at addresses 00h, 08h, 10h, ..., 78h. Attempting to write across a page boundary (e.g., starting at 07h and writing 8 bytes) causes wraparound within the same page instead of advancing to the next. Firmware must align page writes to 8-byte boundaries to avoid unintended overwrites.

Is the 24LC01BH-E/MS RoHS compliant and lead-free?

Yes, the 24LC01BH-E/MS is Pb-free and RoHS compliant per Microchip's DS22104A documentation. The "E" in the part number denotes automotive temperature grade (–40°C to +125°C), and the "MS" suffix specifies the 8-lead MSOP package with matte tin (Sn) plating per JEDEC standards. Full compliance documentation, including substance declarations, is available through Microchip's official product page and Aetrix Electronics' material compliance portal.