Microchip Technology 24LC04BHT-E/MNY

Overview

24LC04BHT-E/MNY from Microchip Technology Inc. is a 4-Kbit I²C-compatible serial EEPROM organized as two 256 × 8-bit blocks, operating from 2.5V to 5.5V with 400 kHz max clock frequency, 1 µA standby current, and hardware write-protect for the upper half-array (100h–1FFh). It is used in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the 24LC04BHT-E/MNY datasheet, 24LC04BHT-E/MNY pinout, 24LC04BHT-E/MNY application, or 24LC04BHT-E/MNY equivalent, key selection criteria include extended temperature support (–40°C to +125°C), MSOP-8 packaging, half-array write-protection logic, and compatibility with I²C bus timing at 400 kHz under 2.5V–5.5V supply.

Technical Context

The 24LC04BHT-E/MNY implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address counter supports current-address, random, and sequential read modes, while the 16-byte page write buffer enables efficient bulk writes within physical page boundaries (00h–0Fh, 10h–1Fh, etc.).

Write protection is controlled solely by the WP pin: tied to VCC, it disables writes to addresses 100h–1FFh; tied to VSS, full array access is enabled. The device uses self-timed erase/write cycles with no external timing components required, and supports acknowledge polling to detect write completion without fixed delays.

Key Specifications

Pinout & Package

24LC04BHT-E/MNY is packaged in an 8-lead MSOP (MNY) with exposed pad, measuring 3.0 mm × 3.0 mm × 0.95 mm. Pin 1 is marked with a dot; pins A0–A2 are not internally connected 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 EEPROM applications.

Compared with 24LC04BHT-E/MNY, the 24AA04HT-I/MNY sacrifices extended temperature and automotive qualification for lower-voltage operation, while the AT24C04D-MAHM-T trades hardware write-protection for faster clock support - making 24LC04BHT-E/MNY optimal for safety-critical, high-reliability deployments requiring guaranteed partial-array lockdown.

Availability

24LC04BHT-E/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and medical device settings storage requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24LC04BHT-E/MNY 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 24LC04BHT-E/MNY belongs to Microchip's 24XX04H family of I²C EEPROMs, engineered for robust nonvolatile data storage in harsh environments where extended temperature operation, AEC-Q100 compliance, and hardware-level write protection are mandatory.

FAQ

What is the function of the A0, A1, and A2 pins on the 24LC04BHT-E/MNY?

The A0, A1, and A2 pins on the 24LC04BHT-E/MNY are not internally connected and serve no functional purpose. They may be left floating or tied to VSS or VCC without affecting device operation or I²C addressing, as the 24LC04BHT-E/MNY uses a fixed 4-bit client address (1010) with two "don't care" bits and a block-select bit - eliminating the need for external address configuration.

How does the WP pin affect memory access in the 24LC04BHT-E/MNY?

When the WP pin on the 24LC04BHT-E/MNY is tied to VCC, write operations to memory addresses 100h–1FFh (upper 2 Kbit block) are inhibited, while reads remain fully functional; tying WP to VSS enables full-array read/write access. This hardware-level protection is active regardless of I²C command sequence and cannot be overridden by software, ensuring reliable safeguarding of critical calibration or configuration data.

What is the maximum I²C clock frequency supported by the 24LC04BHT-E/MNY?

The 24LC04BHT-E/MNY supports a maximum I²C clock frequency of 400 kHz when operated within its specified VCC range of 2.5V to 5.5V. At this rate, it complies with I²C fast-mode timing requirements including THIGH ≥ 600 ns, TLOW ≥ 1300 ns, and TSU:DAT ≥ 100 ns - enabling reliable communication with standard microcontroller I²C peripherals without custom timing adjustments.

Can the 24LC04BHT-E/MNY perform page writes across physical page boundaries?

No, the 24LC04BHT-E/MNY cannot perform page writes across physical page boundaries. Its 16-byte page buffer wraps around within the current page (e.g., writing 16 bytes starting at address 0Fh will overwrite bytes 00h–0Eh instead of proceeding to page 10h–1Fh). Application firmware must ensure page write start addresses align to 00h modulo 10h to avoid unintended data corruption - a constraint explicitly documented in the 24LC04BHT-E/MNY datasheet.

Is the 24LC04BHT-E/MNY qualified for automotive applications?

Yes, the 24LC04BHT-E/MNY is AEC-Q100 qualified and rated for the extended temperature range of –40°C to +125°C, making it suitable for automotive applications such as engine control units, body control modules, and ADAS sensor interfaces. This qualification covers stress testing for thermal cycling, humidity bias, and mechanical shock - confirming reliability in under-hood and cabin-mounted electronic systems.