Microchip Technology 24LC01B-E/P

Overview

24LC01B-E/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 supports page writes (up to 8 bytes), features Schmitt-trigger inputs and slope-controlled outputs, and is rated for Industrial (–40°C to +85°C) and Extended (–40°C to +125°C) temperature ranges in PDIP-8 packaging.

For engineers reviewing the 24LC01B-E/P datasheet, 24LC01B-E/P pinout, 24LC01B-E/P application, or 24LC01B-E/P equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), I²C bus timing at 400 kHz, WP-enabled hardware write protection, endurance (>1 million cycles), and data retention (>200 years) - all validated for extended-temperature embedded control and sensor calibration storage.

Technical Context

The 24LC01B-E/P implements a two-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and page write modes with self-timed internal erase/write cycles. Its Address Pointer auto-increments during sequential reads and retains position across operations.

It uses an on-chip HV generator for EEPROM programming, integrates Schmitt-trigger inputs and output slew-rate control to suppress ground bounce and noise, and relies on external pull-up resistors on SDA/SCL (e.g., 2 kΩ for 400 kHz). Write protection is implemented via dedicated WP pin logic, independent of I²C commands.

Key Specifications

Pinout & Package

24LC01B-E/P is supplied in an 8-lead Plastic Dual In-Line Package (PDIP), 300 mil body width, with through-hole mounting and JEDEC-standard pinout. Pin 1 is marked by notch or dot; package meets RoHS requirements and supports wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01B-E/P, 24AA01-I/P offers broader voltage flexibility but slower performance at low VCC, while AT24C01C-PU delivers higher bandwidth at the expense of temperature and automotive qualification - making 24LC01B-E/P optimal for extended-temp, write-protected, 2.5–5.5V embedded control.

Availability

24LC01B-E/P is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical diagnostic device settings, and smart energy meter firmware patch storage requiring stable component supply and long-term lifecycle support.

Supply support for 24LC01B-E/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC01B belongs to Microchip's 24XX01 family of I²C serial EEPROMs, designed specifically for reliable, low-power, nonvolatile data storage in space- and power-constrained embedded systems across industrial, automotive, and medical markets.

FAQ

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

The 24LC01B-E/P supports a maximum I²C clock frequency of 400 kHz when operated within its specified VCC range of 2.5V to 5.5V. At VCC < 2.5V, the device is not rated - unlike the 24AA01, which supports 100 kHz down to 1.7V. This 400 kHz limit directly governs bus timing margins, including minimum THIGH (600 ns) and TLOW (1300 ns), and must be verified against actual bus capacitance and pull-up resistor values in the target design. The 24LC01B-E/P datasheet does not support 1 MHz operation.

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

The WP (Write-Protect) pin on the 24LC01B-E/P provides hardware-level memory lock: when tied to VCC, all write operations to the entire 128-byte memory array (addresses 00h–7Fh) are inhibited, while read operations remain fully functional. When tied to VSS (or left floating, though not recommended), full read/write access is enabled. This logic-level control operates independently of I²C commands and persists across power cycles - making it ideal for safeguarding calibrated parameters or safety-critical settings in the 24LC01B-E/P.

What package type is used for the 24LC01B-E/P part number?

24LC01B-E/P uses the 8-lead Plastic Dual In-Line Package (PDIP) with 300 mil body width, denoted by the "P" suffix in the part number. This through-hole package features standard JEDEC pinout (A0–A2, VSS, SDA, SCL, WP, VCC), is RoHS compliant, and supports wave soldering. It is distinct from surface-mount variants like SOIC (24LC01B-I/SN) or TSSOP (24LC01B-I/ST), and the "E" in the part number indicates Extended temperature grade (–40°C to +125°C).

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

Yes, the 24LC01B-E/P supports page write operations with an 8-byte page write buffer. Up to eight sequential bytes can be loaded into the buffer during a single I²C transaction before issuing a Stop condition, after which the internal write cycle begins. Page boundaries align every 8 bytes (e.g., 00h–07h, 08h–0Fh), and crossing a boundary causes wraparound within the current page - so firmware must ensure address alignment. This capability reduces I²C overhead versus byte writes and is confirmed in Section 6.2 of the 24LC01B-E/P datasheet.

Is the 24LC01B-E/P qualified for automotive applications?

Yes, the 24LC01B-E/P is AEC-Q100 qualified for automotive applications. Its Extended temperature grade (–40°C to +125°C) and qualification per AEC-Q100 Rev G stress testing standards make it suitable for under-hood and body-control module use cases. This qualification covers thermal cycling, humidity bias, and ESD robustness - distinct from commercial-grade variants. The "E" in 24LC01B-E/P explicitly denotes this extended-temperature, automotive-capable version, and the device is listed in Microchip's AEC-Q100 qualified products documentation.