Microchip Technology 24AA02HT-I/ST

Overview

24AA02HT-I/ST 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 1 µA max standby current - deployed in embedded system configuration storage, MAC address retention, and sensor calibration data logging.

For engineers reviewing the 24AA02HT-I/ST datasheet, 24AA02HT-I/ST pinout, 24AA02HT-I/ST application, or 24AA02HT-I/ST equivalent, key selection criteria include VCC min (1.7V), I²C clock compatibility (100/400 kHz), WP-enabled half-array protection, endurance (>1M cycles), and SOIC-8 package footprint compliance.

Technical Context

The 24AA02HT-I/ST implements a two-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and page write modes (up to 8 bytes per page). Its internal Address Pointer auto-increments during sequential reads and random accesses, enabling efficient block-level data retrieval without repeated address retransmission.

Write protection is implemented via the dedicated WP pin: tied to VSS enables full-array read/write; tied to VCC locks addresses 80h–FFh against writes while permitting reads. All I/O pins (SDA, SCL, WP) feature Schmitt-trigger inputs and noise filtering (50 ns spike suppression), ensuring robust operation on electrically noisy PCBs.

Key Specifications

Pinout & Package

24AA02HT-I/ST is supplied in an 8-lead SOIC (SN) package, 3.90 mm body width, with standard 1.27 mm pitch and JEDEC-compliant footprint. Pin 1 is marked by a beveled corner or notch; exposed pad is not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA02HT-I/ST, the 24AA02E48T-I/ST adds factory-programmed MAC address capability at no pinout or timing penalty, while the AT24C02D-SSHM-T provides equivalent EEPROM performance without AEC-Q100 validation - making both viable alternatives depending on MAC address need and automotive qualification scope.

Availability

24AA02HT-I/ST is available at Aetrix Electronics and suitable for embedded configuration storage, sensor calibration data retention, and automotive ECU parameter backup requiring stable component supply across multi-year production lifecycles.

Supply support for 24AA02HT-I/ST 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products with broad industrial and automotive certification coverage.

The 24AA02H family was designed for reliable, low-power nonvolatile storage in space-constrained embedded systems - emphasizing voltage flexibility, noise immunity, and factory programmability for end-equipment differentiation.

FAQ

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

The 24AA02HT-I/ST supports up to 400 kHz I²C clock frequency when VCC is 2.5V or higher; at VCC below 2.5V, maximum clock rate drops to 100 kHz. This dual-speed capability ensures interoperability with legacy and modern I²C masters while maintaining timing margin at low supply voltages. The 24AA02HT-I/ST does not require external clock dividers or mode configuration to achieve either speed.

How does the write-protect (WP) pin function on the 24AA02HT-I/ST?

On the 24AA02HT-I/ST, the WP pin enables hardware-based memory protection: when tied to VCC, addresses 80h–FFh (upper 128 bytes) become write-inhibited while remaining readable; when tied to VSS, full-array read/write access is enabled. This allows secure storage of factory-programmed data (e.g., MAC address) alongside user-modifiable parameters in the lower half-array - a feature confirmed in DS20002105B Section 2.4 and Figure 6-3.

Is the 24AA02HT-I/ST AEC-Q100 qualified, and what grade does it meet?

Yes, the 24AA02HT-I/ST is AEC-Q100 qualified per Grade 2 (–40°C to +105°C ambient operating temperature), as explicitly stated in the "Features" section of DS20002105B. This qualification validates its suitability for automotive applications including body control modules, infotainment systems, and ADAS sensor interfaces where extended temperature reliability is required.

Can the 24AA02HT-I/ST be used with 1.8V I²C systems?

Yes, the 24AA02HT-I/ST operates reliably down to 1.7V VCC and supports 100 kHz I²C communication at 1.8V, meeting standard I²C voltage thresholds (VIH ≥ 0.7×VCC = 1.26V, VIL ≤ 0.3×VCC = 0.54V). Its Schmitt-trigger inputs and noise filtering ensure robust signaling in mixed-voltage systems - confirmed by DC Characteristics Table 1-1 and AC Characteristics Table 1-2 in DS20002105B.

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

The A0, A1, and A2 pins on the 24AA02HT-I/ST are not internally connected and serve no functional role - they may be left floating or tied to VSS or VCC without affecting operation. This is explicitly documented in DS20002105B Section 2.1 and Pin Function Table 2-1, distinguishing the 24AA02HT-I/ST from higher-density EEPROMs that use these pins for device addressing.