Microchip Technology 24LC01BH-I/P

Overview

24LC01BH-I/P from Microchip Technology Inc. is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM designed for low-voltage embedded systems requiring nonvolatile configuration storage. It operates from 2.5V to 5.5V, supports 400 kHz I²C clock rate, features hardware write-protect for the upper half-array (40h–7Fh), and delivers 1 μA max standby current at industrial temperature (−40°C to +85°C). It is commonly used in power supply calibration data retention and sensor module parameter storage.

For engineers reviewing the 24LC01BH-I/P datasheet, 24LC01BH-I/P pinout, 24LC01BH-I/P application, or 24LC01BH-I/P equivalent, this page provides verified electrical parameters, package-specific terminal mapping, real-world use cases, and validated alternative parts for design-in flexibility and supply continuity.

Technical Context

The 24LC01BH-I/P implements a slave-only I²C interface with fixed 7-bit device address (1010xxx), where the three A0–A2 pins are unconnected and may be left floating or tied to VSS/VCC without functional impact. Its internal architecture includes an 8-byte page buffer, address pointer auto-increment logic, and Schmitt-triggered SDA/SCL inputs with 50 ns spike filtering.

Write protection is implemented via the WP pin: when pulled high, it disables writes to addresses 40h–7Fh while permitting full read access; no external hardware or firmware configuration is required. The device uses on-chip charge pump for EEPROM programming and incorporates VCC threshold detection to inhibit writes below 1.5V.

Key Specifications

Pinout & Package

24LC01BH-I/P is supplied in an 8-lead PDIP (Plastic Dual In-Line Package) with 300 mil body width. Pin 1 is marked by a notch or dot; leads are numbered counter-clockwise from the notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BH-I/P, the 24AA01H-I/P enables lower-voltage operation but sacrifices automotive qualification, while the AT24C01D-SSHM-T adds speed and ESD margin at the cost of different manufacturer-specific timing tolerances and write-protect behavior.

Availability

24LC01BH-I/P is available at Aetrix Electronics and suitable for industrial sensor modules, power supply calibration systems, and embedded bootloader configuration storage requiring stable component supply across production lifecycles.

Supply support for 24LC01BH-I/P 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, engineered specifically for reliable, low-power, I²C-based nonvolatile data storage in space-constrained industrial and consumer applications.

FAQ

What is the minimum VCC required for reliable operation of the 24LC01BH-I/P?

The 24LC01BH-I/P requires a minimum VCC of 2.5V for full specification compliance, including 400 kHz I²C operation and guaranteed write functionality. Operation below 2.5V is not supported - unlike the 24AA01H variant, which supports down to 1.7V. The device includes a VCC threshold detector that disables internal write logic below ~1.5V to prevent data corruption.

Can the A0, A1, and A2 pins of the 24LC01BH-I/P be left unconnected?

Yes - the A0, A1, and A2 pins of the 24LC01BH-I/P have no internal connection and serve no functional purpose. They may be left floating, tied to VSS, or tied to VCC without altering device behavior or I²C address. This simplifies PCB layout and eliminates need for external pull-up/down resistors on these pins.

How does the WP pin protect memory in the 24LC01BH-I/P?

When the WP pin of the 24LC01BH-I/P is driven high (VCC), writes to memory addresses 40h through 7Fh are inhibited; reads remain fully enabled. Writes to addresses 00h–3Fh are unaffected. When WP is low (VSS), full read/write access to the entire 128-byte array is permitted. No software command is needed - protection is purely hardware-level and immediate.

What is the maximum number of bytes that can be written in a single page write cycle for the 24LC01BH-I/P?

The 24LC01BH-I/P supports a page write buffer of 8 bytes. A single page write operation can program up to 8 consecutive bytes within the same physical page boundary (i.e., addresses aligned to 0–7, 8–15, ..., 120–127). Attempting to cross a page boundary causes wraparound within the current page - so proper firmware alignment is required to avoid unintended overwrites.

Is the 24LC01BH-I/P RoHS compliant and lead-free?

Yes - the 24LC01BH-I/P is Pb-free and RoHS compliant per Microchip's DS22104A documentation. The "P" suffix in the part number denotes the 8-lead PDIP package, and all standard packaging options for this device meet JEDEC J-STD-609 Category 1 matte tin finish requirements. Full compliance documentation is available in Microchip's Pb-free conversion notices.