Microchip Technology 24AA02HT-I/OT

Overview

24AA02HT-I/OT 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 up to 400 kHz clock frequency at V_CC ≥ 2.5V.

For engineers reviewing the 24AA02HT-I/OT datasheet, 24AA02HT-I/OT pinout, 24AA02HT-I/OT application, or 24AA02HT-I/OT equivalent, key selection criteria include low-voltage I²C interface compatibility, half-array hardware write-protection, endurance (>1 million cycles), data retention (>200 years), and SOT-23-5 packaging for space-constrained embedded systems.

Technical Context

The 24AA02HT-I/OT implements a two-wire I²C bus protocol with fixed 7-bit client address (1010xxx) and R/W bit control. Its internal Address Pointer auto-increments during sequential reads and page writes, enabling efficient block access without repeated address transmission.

It uses open-drain SDA/SCL with integrated Schmitt triggers and input filtering (50 ns spike suppression), ensuring robust operation on noisy buses. Write protection is implemented via dedicated WP pin logic that disables writes to addresses 80h–FFh when pulled high, while allowing full read access regardless of WP state.

Key Specifications

Pinout & Package

24AA02HT-I/OT is supplied in a 5-lead SOT-23 package (JEDEC MO-178AA), with footprint dimensions of 2.9 mm × 1.6 mm × 1.1 mm (L × W × H), optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02BHT-I/OT, the 24AA02HT-I/OT enables true low-voltage operation; compared with AT24C02D-SSHM-T, it provides deterministic hardware write-protect for safety-critical identifiers without firmware dependency.

Availability

24AA02HT-I/OT is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant nonvolatile memory.

Supply support for 24AA02HT-I/OT 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, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and development tools.

The 24AA02H family delivers compact, low-power I²C EEPROMs designed specifically for secure, persistent storage of device identity and calibration data in space- and power-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24AA02HT-I/OT?

The 24AA02HT-I/OT supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher. At V_CC between 1.7V and 2.5V, the maximum clock frequency is limited to 100 kHz per DS20002105B specification. This dual-speed capability allows flexible integration across diverse voltage domains without redesigning the I²C interface logic.

How does the hardware write-protect feature work on the 24AA02HT-I/OT?

The WP pin on the 24AA02HT-I/OT controls hardware write-protection: when tied to V_CC, writes to memory addresses 80h–FFh are disabled while reads remain fully functional; when tied to V_SS, full read/write access is enabled. This feature is implemented entirely in hardware and requires no firmware intervention, making it ideal for safeguarding immutable device identifiers like MAC addresses.

Is the 24AA02HT-I/OT AEC-Q100 qualified?

Yes, the 24AA02HT-I/OT is AEC-Q100 qualified for automotive applications. It meets Grade 2 temperature requirements (−40°C to +105°C) and has been validated for reliability under automotive stress conditions including HTOL, ESD, and thermal cycling. The "I" suffix in the part number denotes Industrial temperature grade (−40°C to +85°C), which is included in the AEC-Q100 qualification scope.

What package type is used for the 24AA02HT-I/OT?

The 24AA02HT-I/OT is packaged in a 5-lead SOT-23 (MO-178AA) surface-mount package measuring 2.9 mm × 1.6 mm × 1.1 mm. This compact footprint supports high-density PCB layouts in space-constrained applications such as wearable medical devices and automotive ECUs, and is compatible with standard reflow soldering profiles.

Can the 24AA02HT-I/OT be used with 1.8V microcontrollers?

Yes, the 24AA02HT-I/OT operates reliably with 1.8V microcontrollers because its V_CC range starts at 1.7V and its I²C interface meets standard voltage thresholds (VIH = 0.7×V_CC, VIL = 0.3×V_CC). At 1.8V, VIH is 1.26V and VIL is 0.54V - well within typical 1.8V GPIO output swing, eliminating the need for level-shifting circuitry in most designs.