Microchip Technology 24AA01HT-I/MNY

Overview

24AA01HT-I/MNY from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for half-array (addresses 40h–7Fh). It supports page writes of up to 8 bytes and delivers ≤1 μA standby current, enabling use in battery-backed real-time clocks and low-power sensor calibration storage.

For engineers reviewing the 24AA01HT-I/MNY datasheet, 24AA01HT-I/MNY pinout, 24AA01HT-I/MNY application, or 24AA01HT-I/MNY equivalent, key selection criteria include its 1.7V minimum VCC, Schmitt-triggered SDA/SCL inputs for noise immunity, 3 ms typical page write time, half-array hardware write-protection via WP pin, and compatibility with standard I²C bus timing at both 100 kHz and 400 kHz.

Technical Context

The 24AA01HT-I/MNY implements a slave-only I²C interface with fixed 4-bit device address (1010b) and three "don't care" block select bits, enabling single-device addressing on shared buses without A0–A2 pin dependencies. Its internal address pointer auto-increments during sequential reads and page writes, supporting continuous 8-byte burst writes within a single physical page boundary.

Write protection is implemented via the WP pin: tied to VSS enables full-array read/write; tied to VCC disables writes to addresses 40h–7Fh while permitting full-array reads. The device includes on-chip voltage threshold detection (<1.5V disable), Schmitt-trigger inputs with ≥50 ns spike suppression, and open-drain SDA/SCL outputs requiring external pull-ups.

Key Specifications

Pinout & Package

24AA01HT-I/MNY uses an 8-lead Plastic Dual Flat, No Lead (DFN) package (MNY), measuring 2 mm × 3 mm × 0.55 mm, with wettable flank leads for automated optical inspection. Pin 1 is marked by a dot; pins are arranged in a 2×4 configuration with exposed thermal pad (EP) connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01BHT-I/MNY and AT24C01D-MAHM-T, the 24AA01HT-I/MNY uniquely combines 1.7V operation, hardware half-array write protection, and Microchip's proven endurance/reliability-making it optimal for safety-critical or ultra-low-power designs where voltage headroom and data integrity are primary concerns.

Availability

24AA01HT-I/MNY is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, medical wearables, and automotive body control units requiring stable component supply, long-term data retention, and robust I²C interface performance.

Supply support for 24AA01HT-I/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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24AA01H family was designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal external components and broad supply voltage tolerance.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA01HT-I/MNY?

The 24AA01HT-I/MNY operates reliably down to 1.7V across its full industrial temperature range (−40°C to +85°C). Below 1.7V, internal voltage detection disables write operations to prevent data corruption. At 1.7V–2.5V, maximum I²C clock frequency is limited to 100 kHz; above 2.5V, it supports up to 400 kHz. This makes the 24AA01HT-I/MNY suitable for direct connection to 1.8V logic rails without level shifting.

How does the hardware write-protect feature function on the 24AA01HT-I/MNY?

The WP pin on the 24AA01HT-I/MNY controls hardware write protection: when tied to VCC, writes to memory addresses 40h–7Fh are inhibited while reads remain fully functional; when tied to VSS, full-array read/write access is enabled. Addresses 00h–3Fh are always writable regardless of WP state. This allows separation of factory-programmed data (protected) from user-modifiable parameters (unprotected).

Can the 24AA01HT-I/MNY perform page writes across memory boundaries?

No. Page writes on the 24AA01HT-I/MNY are restricted to a single physical page of 8 bytes. If a page write command attempts to cross a page boundary (e.g., starting at address 7Eh), the address counter wraps around to the start of the same page (7Eh → 7Fh → 78h), overwriting earlier bytes instead of advancing to the next page. Application firmware must ensure word addresses for multi-byte writes align to page boundaries (00h, 08h, 10h, ..., 78h) to avoid unintended data loss.

What is the purpose of the A0, A1, and A2 pins on the 24AA01HT-I/MNY?

The A0, A1, and A2 pins on the 24AA01HT-I/MNY are not internally connected and serve no functional role. They may be left floating or tied to VSS or VCC without affecting device operation. This simplifies PCB layout and eliminates the need for external resistors or jumpers to configure I²C slave addresses-the 24AA01HT-I/MNY uses a fixed 4-bit device code (1010b) with three "don't care" bits, resulting in a single hardwired address.

Does the 24AA01HT-I/MNY support standard I²C bus timing specifications?

Yes, the 24AA01HT-I/MNY complies with standard I²C timing requirements for both 100 kHz (Standard Mode) and 400 kHz (Fast Mode) operation. Key parameters-including THIGH, TLOW, TSU:STA, THD:STA, and TBUF-are specified across its full VCC range (1.7V–5.5V) and temperature range (−40°C to +85°C). Its Schmitt-trigger inputs and controlled output slope further ensure robust timing margin in electrically noisy environments.