Microchip Technology 24AA02HT-I/MNY

Overview

24AA02HT-I/MNY from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protect for the upper half-array (80h–FFh), 1.7V to 5.5V operation, and industrial temperature range (−40°C to +85°C). It features Schmitt-trigger inputs, slope-controlled outputs, 8-byte page write buffer, and supports 100 kHz/400 kHz clock rates.

For engineers reviewing the 24AA02HT-I/MNY datasheet, 24AA02HT-I/MNY pinout, 24AA02HT-I/MNY application, or 24AA02HT-I/MNY equivalent, key selection criteria include low-voltage operation down to 1.7V, half-array write-protection via WP pin, 1 µA standby current, and compatibility with standard I²C bus timing including acknowledge polling during write cycles.

Technical Context

The 24AA02HT-I/MNY 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 erase/write cycles. Its internal Address Pointer enables current-address, random, and sequential read operations without external address latching.

It uses CMOS EEPROM technology with integrated high-voltage generator for programming, Schmitt-trigger input buffers on SDA/SCL for noise immunity, and output slope control to suppress ground bounce. The WP pin provides hardware-level protection of addresses 0x80–0xFF when tied to VCC, while A0–A2 pins are unconnected and may be left floating or tied to VSS/VCC.

Key Specifications

Pinout & Package

24AA02HT-I/MNY is packaged in an 8-lead MSOP (MNY) with exposed pad, measuring 3.0 mm × 3.0 mm × 1.0 mm. Pin 1 is marked with a dot; the exposed pad may be connected to VSS or left floating per layout requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02HT-I/MNY, the 24LC02BHT-I/MNY excludes sub-2.5V operation but offers identical packaging and interface, whereas AT24C02D-MAHM-T delivers full functional equivalence with alternate supply-chain assurance-both avoid redesign effort when voltage or sourcing constraints arise.

Availability

24AA02HT-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive ECU identification, and IoT edge node provisioning requiring stable component supply across extended product lifecycles.

Supply support for 24AA02HT-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 24AA02H family was designed specifically for cost-sensitive, space-constrained applications needing reliable nonvolatile storage with hardware write protection and ultra-low power consumption in industrial and automotive environments.

FAQ

What is the maximum clock frequency supported by the 24AA02HT-I/MNY?

The 24AA02HT-I/MNY supports up to 400 kHz I²C clock frequency when VCC is 2.5V or higher. At supply voltages between 1.7V and 2.5V, the maximum clock rate is limited to 100 kHz to ensure timing margin compliance. This dual-speed capability allows seamless integration across mixed-voltage systems without protocol changes.

How does the WP pin function on the 24AA02HT-I/MNY?

When the WP pin of the 24AA02HT-I/MNY is tied to VCC, write operations to memory addresses 0x80–0xFF are inhibited while reads remain fully functional. When WP is tied to VSS, full memory access (0x00–0xFF) is enabled. This hardware-level protection requires no software intervention and remains active regardless of I²C bus state.

Is the 24AA02HT-I/MNY compatible with standard I²C protocols?

Yes, the 24AA02HT-I/MNY implements a fully compliant I²C interface with fixed 7-bit slave address (1010xxx), standard Start/Stop conditions, ACK/NACK signaling, and support for repeated Start. It adheres to I²C specification timing requirements including THD:STA, TSU:DAT, and TAA across its full operating voltage and temperature range.

What is the purpose of the A0, A1, and A2 pins on the 24AA02HT-I/MNY?

The A0, A1, and A2 pins on the 24AA02HT-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, addressing, or I²C communication - unlike higher-density EEPROMs in the same family that use these pins for address expansion.

Does the 24AA02HT-I/MNY require external components for I²C operation?

Yes, the 24AA02HT-I/MNY requires external pull-up resistors on both SDA and SCL lines. Recommended values are 2 kΩ for 400 kHz operation and 10 kΩ for 100 kHz. No other external components are needed for basic read/write functionality, though decoupling capacitors near VCC are strongly advised for noise suppression.