Microchip Technology 24AA025T-I/OT

Overview

24AA025T-I/OT 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 industrial temperature range (–40°C to +85°C). It features 16-byte page write buffer, 400 kHz max clock speed, and Schmitt-trigger inputs for noise immunity-used in embedded system configuration storage, sensor calibration data retention, and secure device identity storage.

For engineers reviewing the 24AA025T-I/OT datasheet, 24AA025T-I/OT pinout, 24AA025T-I/OT application, or 24AA025T-I/OT equivalent, key selection criteria include its SOT-23-6 package, absence of hardware write-protect (WP), 1 μA standby current, and compatibility with multi-device I²C bus topologies up to eight devices (four in SOT-23).

Technical Context

The 24AA025T-I/OT implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A0–A2), enabling up to four devices on a single bus in its SOT-23-6 package due to A2 pin omission. Its internal address pointer auto-increments during sequential reads and supports current-address, random, and sequential read modes.

Write operations are self-timed with ≤5 ms byte/page cycle time; acknowledge polling is supported to detect write completion. The device lacks internal WP connection (per datasheet Note: "WP pin is not internally connected on the 24XX025"), eliminating hardware write protection-unlike 24AA024 variants-and relies solely on software-controlled access control.

Key Specifications

Pinout & Package

24AA025T-I/OT is supplied in a Pb-free, RoHS-compliant 6-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm). Pin 1 is marked by laser; pin 3 is SDA (open-drain, requires external pull-up); pin 1 is SCL; pins 4 and 5 are A1 and A0 address inputs; pin 2 is VSS; pin 6 is VCC. A2 and WP pins are not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA025T-I/OT, the 24AA024T-I/OT adds hardware write protection at the cost of one less usable address bit (A2), while AT24C02D-SSHM-T trades Microchip's proven industrial reliability for higher speed and extended high-temp retention-making 24AA025T-I/OT optimal for cost-sensitive, noise-immune, low-power applications where software-controlled write access suffices.

Availability

24AA025T-I/OT is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device configuration storage, and automotive body-control modules requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for 24AA025T-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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AAxx family was designed specifically for low-voltage, low-power embedded systems requiring robust, cost-effective nonvolatile memory-targeting applications in consumer electronics, industrial controls, and automotive subsystems.

FAQ

What is the maximum I²C clock frequency supported by the 24AA025T-I/OT?

The 24AA025T-I/OT supports up to 400 kHz I²C clock frequency when VCC ≥ 1.8V. At VCC < 1.8V, maximum clock drops to 100 kHz per DS21210N Table 1-2. This dual-speed capability ensures interoperability across diverse supply domains while maintaining timing compliance under brown-out conditions.

Does the 24AA025T-I/OT have a hardware write-protect (WP) pin?

No, the 24AA025T-I/OT does not have an internally connected WP pin-this is explicitly confirmed in the datasheet: "WP pin is not internally connected on the 24XX025." Unlike the 24AA024T-I/OT, write protection must be implemented in software or via external logic when using 24AA025T-I/OT.

How many 24AA025T-I/OT devices can be connected on the same I²C bus?

Up to four 24AA025T-I/OT devices can share one I²C bus. Because the SOT-23-6 package omits the A2 pin, only A0 and A1 are available for chip-select addressing-yielding 2² = 4 unique device addresses (1010_00, 1010_01, 1010_10, 1010_11) per the control byte format in Figure 5-1.

What is the page write buffer size of the 24AA025T-I/OT?

The 24AA025T-I/OT has a 16-byte page write buffer. This allows the host MCU to transmit up to 16 contiguous bytes in a single I²C transaction before issuing the Stop condition that triggers the internal self-timed write cycle-reducing bus arbitration overhead and improving throughput versus byte-write mode.

Is the 24AA025T-I/OT compatible with 1.8V microcontrollers?

Yes, the 24AA025T-I/OT operates from 1.7V to 5.5V and is fully compatible with 1.8V systems. Its VIH threshold is 0.7×VCC (min), ensuring reliable logic-high recognition at 1.8V (VIH ≥ 1.26V), and it meets all AC timing specs-including 400 kHz clock support-at VCC ≥ 1.8V per Table 1-2.