Microchip Technology 24AA024T-I/ST

Overview

24AA024T-I/ST from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 1.7V to 5.5V with hardware write-protection via the WP pin, 400 kHz max clock (100 kHz below 2.5V), and industrial temperature range (–40°C to +85°C). It supports up to eight devices on one bus and delivers 1 μA standby current and 1 mA read current for low-power embedded systems including sensor calibration storage and configuration retention in IoT edge nodes.

For engineers reviewing the 24AA024T-I/ST datasheet, 24AA024T-I/ST pinout, 24AA024T-I/ST application, or 24AA024T-I/ST equivalent, key selection considerations include its 8-lead TSSOP package, hardware write-protect functionality, 16-byte page write buffer, Schmitt-trigger noise immunity on SDA/SCL, and compatibility with standard I²C master controllers across 1.7–5.5V supply rails.

Technical Context

The 24AA024T-I/ST implements a true 2-wire I²C interface with slave address format '1010' followed by three chip-select bits (A2/A1/A0) and R/W bit, enabling up to eight devices on a shared bus. Its internal address pointer auto-increments during sequential reads and wraps from 0xFF to 0x00.

It features a dedicated hardware write-protect (WP) pin tied to VCC/VSS to lock the entire 2 Kbit array, Schmitt-trigger inputs with 0.05 VCC hysteresis for noise suppression, and slope-controlled outputs to minimize ground bounce - all validated for industrial-temperature operation without external timing components.

Key Specifications

Pinout & Package

24AA024T-I/ST is housed in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and Pb-free per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA024T-I/ST, the 24LC024T-I/ST trades 1.7V operation and hardware write-protection for marginally lower cost, while the AT24C02-SSHM-T offers higher speed but removes the physical write-lock - making 24AA024T-I/ST optimal for safety-critical, ultra-low-voltage, or brownout-prone applications.

Availability

24AA024T-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration storage, and automotive body control unit programming requiring stable component supply across extended product lifecycles.

Supply support for 24AA024T-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 leading provider of microcontrollers, analog, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 24AA024T-I/ST belongs to Microchip's legacy 24XX series of I²C EEPROMs, designed specifically for robust, low-power, and pin-efficient nonvolatile storage in resource-constrained embedded systems.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA024T-I/ST?

The 24AA024T-I/ST operates reliably down to 1.7V, with full specification compliance across the industrial temperature range (–40°C to +85°C). Below 1.7V, the internal VCC threshold detector disables write operations to prevent data corruption - a safeguard confirmed in DS21210N Section 2.5. This makes the 24AA024T-I/ST uniquely suited for 1.8V systems and battery-powered designs where voltage droop occurs.

Does the 24AA024T-I/ST support page write operations, and what is the maximum number of bytes per page?

Yes, the 24AA024T-I/ST supports page write operations with a 16-byte page buffer. Each page write must remain within a single 16-byte boundary (addresses 0x00–0x0F, 0x10–0x1F, etc.); crossing boundaries causes wraparound within the page. This behavior is explicitly defined in DS21210N Section 6.2 and Figure 6-2, ensuring predictable memory management in firmware implementations of the 24AA024T-I/ST.

How does the WP pin function on the 24AA024T-I/ST, and is it present on all packages?

The WP pin on the 24AA024T-I/ST is a hardware write-protect input: tying it to VCC locks the entire 2 Kbit array against all write commands, while tying it to VSS enables full write access. As confirmed in DS21210N Section 2.4 and Pin Function Table, WP is present on all 8-lead packages (including TSSOP), but absent on SOT-23 variants - and the 24AA024T-I/ST uses TSSOP, so WP is fully functional.

What I²C clock speeds are supported by the 24AA024T-I/ST, and how does voltage affect timing?

The 24AA024T-I/ST supports up to 400 kHz clock speed when VCC ≥ 1.8V, and 100 kHz when VCC < 1.8V (DS21210N Table 1-2, Note 1). AC timing parameters including THIGH, TLOW, and TSU:DAT scale accordingly - e.g., THIGH min is 4000 ns at 1.7V ≤ VCC < 1.8V but only 600 ns at 1.8V ≤ VCC ≤ 5.5V. This dual-speed capability ensures interoperability across mixed-voltage I²C buses.

Is the 24AA024T-I/ST compatible with standard I²C protocol, and does it generate ACK during internal write cycles?

Yes, the 24AA024T-I/ST is fully compliant with standard I²C protocol, including START/STOP conditions, 7-bit slave addressing (1010xxx), and ACK/NACK handshaking. Crucially, it does not generate ACK during internal write cycles (DS21210N Section 7.0), enabling reliable ACK polling to detect write completion - a feature essential for deterministic firmware timing in real-time systems using the 24AA024T-I/ST.