Microchip Technology 24LC01BH-I/MS

Overview

24LC01BH-I/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 temperature range (–40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for addresses 40h–7Fh. It serves as nonvolatile configuration storage in embedded microcontroller systems requiring low-power, noise-immune bus interfacing.

For engineers reviewing the 24LC01BH-I/MS datasheet, 24LC01BH-I/MS pinout, 24LC01BH-I/MS application, or 24LC01BH-I/MS equivalent, this page delivers verified electrical specs, MSOP package terminal mapping, I²C timing constraints, half-array write-protection behavior, and real-world use cases in power management and sensor calibration subsystems.

Technical Context

The 24LC01BH-I/MS implements a slave-only I²C interface with Schmitt-trigger inputs on SDA/SCL, internal address pointer auto-increment, and page-write capability up to 8 bytes per cycle. Its write-protect logic responds solely to WP pin voltage level - tied to VCC for 40h–7Fh protection, VSS for full-array access.

It features a 3 ms typical byte/page write cycle, 1 μA max standby current at 5.5V, and 1 mA max active read current. The device uses on-chip charge pump for EEPROM programming and includes VCC threshold detection to inhibit writes below 1.5V, preventing data corruption during brown-out conditions.

Key Specifications

Pinout & Package

24LC01BH-I/MS is packaged in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body, and exposed pad option not present - suitable for space-constrained PCB layouts while maintaining hand-solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BH-I/MS, 24AA01H-I/MS enables lower-voltage operation at the cost of reduced automotive qualification, while AT24C01D-SSHM-T trades fixed hardware protection for software-defined flexibility - impacting firmware complexity and security model.

Availability

24LC01BH-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, consumer device configuration, and automotive body control module applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC01BH-I/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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC01BH belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile storage in resource-constrained embedded systems across industrial, automotive, and consumer markets.

FAQ

What is the I²C address of the 24LC01BH-I/MS and how is it determined?

The 24LC01BH-I/MS has a fixed 7-bit I²C slave address of 1010xxx, where the three least-significant bits (A2–A0) are no-connect pins with no internal bonding. Therefore, the device always responds to address 0x50 (binary 1010000) for write operations and 0x51 for read operations - independent of external pin states. This simplifies bus arbitration in multi-device systems.

Does the 24LC01BH-I/MS support page writes, and what is the maximum page size?

Yes, the 24LC01BH-I/MS supports page writes with a maximum buffer size of 8 bytes. Page writes allow up to 8 sequential bytes to be loaded into the on-chip buffer and committed to memory upon receipt of a Stop condition. Attempting to write across a physical page boundary (e.g., from address 7Eh to 7Fh then 00h) causes wraparound within the same page - requiring firmware to enforce page-aligned writes.

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

When the WP pin on the 24LC01BH-I/MS is driven high (VCC), write operations to memory addresses 40h–7Fh are inhibited; reads remain fully functional. Addresses 00h–3Fh remain writable. When WP is low (VSS), full-array write access is enabled. This hardware-level protection requires no I²C commands and remains active even during power cycling.

What is the typical write cycle time for the 24LC01BH-I/MS, and how can firmware detect completion?

The typical write cycle time for the 24LC01BH-I/MS is 3 ms for both byte and page writes. Firmware can detect completion using acknowledge polling: after issuing a Stop condition, the master repeatedly sends a Start + control byte (R/W = 0); the device returns an ACK only once the internal write cycle completes. This avoids fixed delays and maximizes I²C bus utilization.

Is the 24LC01BH-I/MS compatible with 100 kHz and 400 kHz I²C buses, and are there voltage dependencies?

Yes, the 24LC01BH-I/MS supports both 100 kHz and 400 kHz I²C modes. However, 400 kHz operation requires VCC ≥2.5V; if VCC drops below 2.5V, maximum clock frequency is limited to 100 kHz per datasheet Table 1-2. This ensures timing margins are maintained across the specified voltage range without requiring dynamic clock rate adjustment in firmware.