Microchip Technology 24AA025-I/SN

Overview

24AA025-I/SN 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), 400 kHz max clock frequency, and 16-byte page write buffer. It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-power, noise-immune bus interfacing.

For engineers reviewing the 24AA025-I/SN datasheet, 24AA025-I/SN pinout, 24AA025-I/SN application, or 24AA025-I/SN equivalent, key selection considerations include its SOT-23-6 package, absence of hardware write-protect (WP), Schmitt-trigger I²C inputs, 1 μA standby current, and cascading support for up to four devices on one bus.

Technical Context

The 24AA025-I/SN implements a standard two-wire I²C slave interface with open-drain SDA/SCL pins, internal address pointer auto-increment, and acknowledge polling for write-cycle completion detection. Its memory array supports byte and page writes with self-timed erase/write cycles.

Unlike the 24AA024 variant, the 24AA025-I/SN omits internal connection of the WP pin and excludes A2 in the SOT-23 package - limiting chip-select combinations to four devices per bus. It uses Schmitt-trigger inputs and input filtering to suppress noise spikes up to 50 ns.

Key Specifications

Pinout & Package

24AA025-I/SN is packaged in a Pb-free, RoHS-compliant 6-lead SOT-23 surface-mount package (3.0 mm × 1.7 mm × 1.3 mm). Pin 1 is marked by laser dot; pin 1 = SCL, pin 2 = VSS, pin 3 = SDA, pin 4 = A1, pin 5 = A0, pin 6 = VCC. A2 and WP are not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC025-I/SN, the 24AA025-I/SN enables lower-voltage operation and matches industrial temp needs, while AT24C02-SSHM-T trades package compatibility for different noise-handling and timing behavior - making each optimal for distinct power, thermal, and layout constraints.

Availability

24AA025-I/SN is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, medical wearables, and automotive body control units requiring stable component supply, long-term manufacturability, and guaranteed RoHS/Pb-free compliance.

Supply support for 24AA025-I/SN 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA025-I/SN belongs to Microchip's 24XX025 family of serial EEPROMs, designed specifically for low-voltage, low-power embedded systems needing reliable nonvolatile storage with minimal board space and I²C bus simplicity.

FAQ

What is the maximum I²C clock frequency supported by the 24AA025-I/SN?

The 24AA025-I/SN supports up to 400 kHz I²C clock frequency when VCC ≥ 1.8V. At VCC < 1.8V, the maximum clock rate drops to 100 kHz per Microchip DS21210N specification. This dual-speed capability ensures interoperability across both standard and fast-mode I²C masters while maintaining timing compliance across its full 1.7V–5.5V supply range.

Does the 24AA025-I/SN have hardware write protection?

No, the 24AA025-I/SN does not include hardware write protection. The WP pin is not internally connected, and the device lacks the write-protect circuitry found in the 24AA024 variant. All memory locations are writable whenever the device is powered and addressed - making it ideal for applications requiring dynamic configuration updates without external pin management.

How many 24AA025-I/SN devices can be connected on a single I²C bus?

Up to four 24AA025-I/SN devices can share one I²C bus. Because the SOT-23 package omits the A2 pin, only A1 and A0 are available for chip-select addressing - yielding four unique slave addresses (1010_00, 1010_01, 1010_10, 1010_11). This allows scalable memory expansion to 8 Kbits total without bus contention or address collision.

What is the page write buffer size of the 24AA025-I/SN?

The 24AA025-I/SN features a 16-byte page write buffer. During a page write operation, the device accepts up to 16 sequential bytes after the initial word address, storing them temporarily before committing all bytes simultaneously in a self-timed internal write cycle. This reduces I²C transaction overhead and accelerates bulk configuration updates compared to byte-write sequences.

Is the 24AA025-I/SN compatible with 1.8V microcontrollers?

Yes, the 24AA025-I/SN is fully compatible with 1.8V microcontrollers. Its 1.7V–5.5V operating range, Schmitt-trigger inputs, and 0.3 VCC/0.7 VCC input thresholds ensure robust logic-level recognition and noise immunity at 1.8V. External pull-up resistors should be sized appropriately (e.g., 10 kΩ for 100 kHz, 2 kΩ for 400 kHz) to meet rise-time requirements.