Microchip Technology 24LC01B-I/P

Overview

24LC01B-I/P from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 400 kHz max clock frequency, and operation from 2.5V to 5.5V. It features 8-byte page write buffering, Schmitt-trigger inputs for noise immunity, and supports industrial temperature range (–40°C to +85°C). It is commonly used in embedded systems for storing calibration data, configuration settings, or firmware boot parameters.

For engineers reviewing the 24LC01B-I/P datasheet, 24LC01B-I/P pinout, 24LC01B-I/P application, or 24LC01B-I/P equivalent, this page delivers verified electrical specs, package-confirmed pin functions, real-world use cases, and two validated alternative parts with documented functional and application-level differences.

Technical Context

The 24LC01B-I/P implements a 2-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control. Its internal architecture includes an Address Pointer, page latches, and EEPROM array with self-timed erase/write cycles - eliminating external timing dependencies during writes.

It uses Schmitt-trigger inputs on SDA and SCL with 50 ns spike suppression and slope-controlled outputs to minimize ground bounce. Write protection is implemented via the dedicated WP pin, which disables all write operations when tied to VCC - a hardware-level safeguard independent of software state.

Key Specifications

Pinout & Package

24LC01B-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 spaced at 0.100" pitch. The package is through-hole mountable and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01B-I/P, the 24AA01-I/P extends low-voltage operation at the cost of reduced noise margin below 2.5V, while the 24LC01BT-I/OT maintains identical functionality in a space-saving TSSOP package - enabling direct migration from through-hole to SMT without logic or timing redesign.

Availability

24LC01B-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and automotive ECU boot parameter storage requiring stable component supply, long-term obsolescence planning, and consistent RoHS-compliant sourcing.

Supply support for 24LC01B-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions for embedded control applications.

The 24LC01B belongs to Microchip's 24XX01 family of I²C serial EEPROMs, designed specifically for reliable, low-power, pin-efficient configuration storage in cost-sensitive and space-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24LC01B-I/P?

The 24LC01B-I/P supports up to 400 kHz I²C clock frequency when VCC is between 2.5V and 5.5V. At lower voltages, it is not rated - unlike the 24AA01, which supports 100 kHz down to 1.7V. This makes the 24LC01B-I/P ideal for systems with stable 3.3V or 5V rails where faster configuration reads are beneficial. The 24LC01B-I/P timing parameters (e.g., THIGH ≥ 600 ns) are fully characterized at 400 kHz across its operating temperature range.

Can the 24LC01B-I/P be used with a 1.8V microcontroller I²C interface?

No - the 24LC01B-I/P requires a minimum VCC of 2.5V and is not specified for operation at 1.8V. Attempting to power it from 1.8V will result in undefined behavior or failure to respond on the I²C bus. For 1.8V systems, consider the 24AA01-I/P, which is rated down to 1.7V and maintains full I²C compatibility. The 24LC01B-I/P must be powered from a compatible rail (e.g., 3.3V) and level-shifted if interfacing with true 1.8V GPIOs.

How does the WP pin function on the 24LC01B-I/P?

The WP (Write-Protect) pin on the 24LC01B-I/P is a hardware-level enable/disable control: when tied to VCC, all write operations (byte and page) to the entire memory array (addresses 00h–7Fh) are blocked, while reads remain fully functional. When tied to VSS (or left floating, though not recommended), full read/write access is enabled. This feature operates independently of power state or I²C commands - providing fail-safe protection against firmware errors or voltage glitches.

What package type does the 24LC01B-I/P use, and is it RoHS compliant?

The 24LC01B-I/P uses an 8-lead PDIP (Plastic Dual In-Line Package) with 300 mil body width and 0.100" lead pitch. It is RoHS compliant per Microchip's documentation (DS20001711M), containing no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. The "I/P" suffix explicitly denotes Industrial temperature grade in PDIP packaging - confirmed by Microchip's part numbering and marking conventions (e.g., "24LC01BI" on top marking).

Does the 24LC01B-I/P support page write operations, and what is the page size?

Yes - the 24LC01B-I/P supports 8-byte page write operations, allowing up to eight sequential bytes to be loaded into the internal page buffer and written simultaneously upon receipt of a STOP condition. The page size is 8 bytes, with boundaries at addresses 00h–07h, 08h–0Fh, etc. Crossing a page boundary during a page write causes wraparound within the current page - so software must align writes to page boundaries or split multi-page transfers manually.