Microchip Technology 24LC01BT-E/MC

Overview

24LC01BT-E/MC 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 write buffer, and operation from 2.5V to 5.5V. It supports 400 kHz clock frequency, delivers ≤1 mA active current and ≤5 µA extended-temperature standby current, and is qualified for automotive AEC-Q100 applications in industrial and extended temperature ranges (–40°C to +125°C). It is commonly used for parameter storage in automotive body control modules.

For engineers reviewing the 24LC01BT-E/MC datasheet, 24LC01BT-E/MC pinout, 24LC01BT-E/MC application, or 24LC01BT-E/MC equivalent, key selection criteria include VCC range compatibility (2.5V–5.5V), E-temp support (–40°C to +125°C), I²C timing compliance at 400 kHz, WP pin functionality for hardware-level write protection, and 8-pin DFN package footprint constraints.

Technical Context

The 24LC01BT-E/MC implements a standard two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes an 8-byte page latch, address pointer logic, and high-voltage generator for EEPROM programming - enabling self-timed erase/write cycles without external timing components.

It uses a fixed 7-bit device address (1010xxx) where the three least-significant bits are "don't care", allowing single-device addressing on shared buses. Write protection is implemented via the dedicated WP pin: tied to VCC, it disables all write operations across the full 00h–7Fh address space while permitting unrestricted reads.

Key Specifications

Pinout & Package

24LC01BT-E/MC is supplied in an 8-lead 2×3 mm DFN package (Microchip drawing C04-2061-LT) with exposed pad. Pin 1 = A0 (NC), Pin 2 = A1 (NC), Pin 3 = A2 (NC), Pin 4 = VSS, Pin 5 = SDA, Pin 6 = SCL, Pin 7 = WP, Pin 8 = VCC. All address pins (A0–A2) are unconnected internally and may be left floating or tied to VSS/VCC without functional impact.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BT-E/MC, the 24LC01B-I/MC offers identical functionality at lower cost but lacks extended-temperature validation, while AT24C01D-SSHM-T supports lower-voltage operation and SOIC packaging but omits automotive qualification and uses a different physical form factor.

Availability

24LC01BT-E/MC is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor calibration, medical device configuration backup, and smart metering applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC01BT-E/MC 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 family was designed specifically for cost-sensitive, low-power I²C-based nonvolatile storage in automotive, industrial, and consumer systems requiring robustness, small footprint, and guaranteed data integrity.

FAQ

What is the maximum I²C clock frequency supported by the 24LC01BT-E/MC?

The 24LC01BT-E/MC supports a maximum clock frequency of 400 kHz under standard-mode I²C operation. This is specified for VCC = 2.5V to 5.5V and ambient temperatures from –40°C to +125°C. It does not support fast-mode (1 MHz) operation like the 24FC01 variant, and its timing parameters (e.g., THIGH, TLOW) are characterized only up to 400 kHz.

Can the A0, A1, and A2 pins of the 24LC01BT-E/MC be used to configure device addressing?

No - the A0, A1, and A2 pins of the 24LC01BT-E/MC are not internally connected and serve no addressing function. The device uses a fixed 7-bit I²C address (1010xxx), where the three LSBs are "don't care". These pins may be left floating or tied to VSS/VCC without affecting communication; they exist solely for package compatibility with higher-density variants like the 24LC02B.

How does the WP pin affect memory access in the 24LC01BT-E/MC?

When the WP pin of the 24LC01BT-E/MC is tied to VCC, all write operations (byte and page) to the entire memory array (addresses 00h–7Fh) are inhibited; reads remain fully functional. When WP is tied to VSS (or left floating, since internal pull-down is not present), normal read/write operation is enabled. This hardware-level protection operates independently of software state and persists across power cycles.

Is the 24LC01BT-E/MC suitable for automotive applications?

Yes - the 24LC01BT-E/MC is explicitly AEC-Q100 qualified for automotive use and rated for the extended temperature range of –40°C to +125°C. Its design includes enhanced ESD protection (>4 kV), robust noise immunity (Schmitt-trigger inputs, slope-controlled outputs), and validated reliability under thermal cycling and high-temperature operating life testing - making it appropriate for body control, lighting, and powertrain subsystems.

What package type is used for the 24LC01BT-E/MC, and what are its key mechanical features?

The 24LC01BT-E/MC uses an 8-lead 2×3 mm DFN package (Microchip drawing C04-2061-LT) with an exposed thermal pad. Key features include 0.5 mm lead pitch, 0.8 mm nominal height, and RoHS-compliant matte tin plating. The exposed pad may be connected to VSS for improved thermal dissipation or left floating; land pattern follows Microchip's recommended layout for solder paste volume and reflow profile control.