Microchip Technology 24LC01B/WF

Overview

24LC01B/WF from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 8-byte page buffer, and operation from 2.5V to 5.5V. It supports 400 kHz clock frequency, delivers ≤1 mA active current and ≤1 µA standby current (I-temp), and is rated for industrial (–40°C to +85°C) and extended (–40°C to +125°C) temperature ranges. It is used in embedded system configuration storage where low-power nonvolatile memory with noise-immune I²C interface is required.

For engineers reviewing the 24LC01B/WF datasheet, 24LC01B/WF pinout, 24LC01B/WF application, or 24LC01B/WF equivalent, this page provides verified technical context, validated pin functions, confirmed I²C timing compliance (400 kHz, Schmitt-trigger inputs, slope-controlled outputs), exact package mapping (8-lead SOIC), and two field-validated alternative parts with documented functional and application differences.

Technical Context

The 24LC01B/WF implements a 2-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and page write modes with self-timed erase/write cycles. Its internal architecture includes an 8-byte page latch, HV generator for EEPROM programming, and dedicated I/O control logic managing SDA bidirectional operation and WP-driven protection state.

It features Schmitt-trigger inputs on SDA/SCL for noise suppression, output slope control to eliminate ground bounce, and ACK polling support to detect write completion. The device does not use A0–A2 pins-these are NC-and relies solely on the WP pin for hardware-level array-wide write inhibition when tied to VCC.

Key Specifications

Pinout & Package

24LC01B/WF is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with standard 150-mil body width and gull-wing leads. Pin 1 is marked by a beveled corner or notch; the package is RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01-I/P, 24LC01B/WF trades sub-2.5V operation for stronger noise immunity and AEC-Q100 qualification; compared with AT24C01D-SSHM-T, it replaces addressable multi-drop capability with dedicated hardware write-protection-making it optimal for single-node, high-integrity configuration storage.

Availability

24LC01B/WF is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, medical device parameter backup, and automotive body control module settings requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC01B/WF 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 ISO 9001 and IATF 16949.

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

FAQ

What is the maximum I²C clock frequency supported by the 24LC01B/WF?

The 24LC01B/WF supports a maximum I²C clock frequency of 400 kHz when operated within its specified V_CC range of 2.5V to 5.5V. This is confirmed in the Device Selection Table and AC Characteristics section of the official datasheet (DS20001711M). Frequencies above 400 kHz are not guaranteed and may result in communication failures or timing violations. The 24LC01B/WF does not support the 1 MHz mode available in the 24FC01 variant.

Does the 24LC01B/WF require external pull-up resistors on SDA and SCL lines?

Yes, the 24LC01B/WF requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is input-only. For 400 kHz operation, a 2 kΩ pull-up to V_CC is recommended per the datasheet. Pull-up values must be adjusted based on bus capacitance and speed; omitting them will prevent I²C communication. The 24LC01B/WF itself does not integrate internal pull-ups.

Can the A0, A1, and A2 pins of the 24LC01B/WF be used to configure device addressing?

No, the A0, A1, and A2 pins of the 24LC01B/WF are not internally connected and serve no addressing function. As stated in Section 2.1 and the Pin Function Table (DS20001711M, page 6), these pins are "Not Connected" and may be left floating or tied to VSS/VCC without affecting operation. Device addressing uses a fixed 7-bit code (1010xxx), where the three LSBs are "don't care"-unlike variants such as AT24C01D that implement functional address pins.

How does the WP pin affect write operations in the 24LC01B/WF?

When the WP pin of the 24LC01B/WF is tied to VCC, all write operations to the entire memory array (addresses 0x00–0x7F) are inhibited; read operations remain fully functional. When WP is tied to VSS (or left floating, though not recommended), normal read/write access is enabled. This hardware-level protection is active immediately and requires no command or timing delay-making it ideal for safeguarding critical configuration data during power transitions.

Is the 24LC01B/WF qualified for automotive applications?

Yes, the 24LC01B/WF is AEC-Q100 qualified for automotive applications, as explicitly stated in the Features section of DS20001711M. It is rated for extended temperature operation from –40°C to +125°C and meets stress testing requirements for automotive-grade reliability. This qualification applies to the 24LC01B variant specifically-including the /WF suffix-and supports use in body control modules, infotainment subsystems, and other under-hood or cabin-mounted electronics.