Microchip Technology 24AA512T-I/SN

Overview

24AA512T-I/SN from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit memory, operating from 1.7V to 5.5V with 400 µA max read current and 1 µA max standby current. It features hardware write-protection, 128-byte page write buffer, and industrial temperature range (−40°C to +85°C), deployed in embedded system configuration storage and firmware parameter retention.

For engineers reviewing the 24AA512T-I/SN datasheet, 24AA512T-I/SN pinout, 24AA512T-I/SN application, or 24AA512T-I/SN equivalent, key selection criteria include I²C clock compatibility up to 400 kHz at V_CC ≥ 2.5V, Schmitt-trigger noise immunity on SDA/SCL, and cascading support for up to eight devices on one bus.

Technical Context

The 24AA512T-I/SN implements a two-wire I²C interface with open-drain SDA/SCL requiring external pull-ups, supporting standard-mode (100 kHz) and fast-mode (400 kHz) timing per JEDEC specifications. Its internal address counter enables sequential reads across the full 512K boundary, while hardware write-protect (WP) disables writes when tied to V_CC.

Page write operations use a 128-byte on-chip buffer with self-timed erase/write cycles completing in ≤5 ms; endurance exceeds 1 million cycles and data retention exceeds 200 years. Addressing uses A0–A2 pins to configure one of eight device addresses, enabling up to 4 Mbit contiguous space via software-managed address bit expansion.

Key Specifications

Pinout & Package

24AA512T-I/SN is packaged in an 8-lead SOIC (SN) with 150 mil body width, RoHS-compliant matte tin plating, and JEDEC-standard footprint compatible with automated PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA512T-I/SN, the 24LC512-I/SN excludes 1.7–2.49V operation but shares identical packaging and timing, while the AT24C512BN-SH-T offers faster clock support and enhanced ESD tolerance at the cost of reduced multi-device address flexibility.

Availability

24AA512T-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy meter applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24AA512T-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.

The 24AA512T-I/SN belongs to Microchip's serial EEPROM product line designed for robust, low-power nonvolatile data storage in industrial, automotive, and medical systems where reliability and long-term data integrity are critical.

FAQ

What is the maximum I²C clock frequency supported by the 24AA512T-I/SN?

The 24AA512T-I/SN supports up to 400 kHz I²C clock frequency when V_CC is 2.5V or higher. At V_CC between 1.7V and 2.49V, maximum clock frequency is limited to 100 kHz. This dual-speed capability allows seamless integration into both legacy 100 kHz and modern fast-mode I²C systems without redesign. The 24AA512T-I/SN does not support 1 MHz operation - that capability is exclusive to the 24FC512 variant.

How does the hardware write-protect (WP) pin function on the 24AA512T-I/SN?

When the WP pin of the 24AA512T-I/SN is tied to V_CC, all write operations - including byte and page writes - are inhibited, while read operations remain fully functional. The WP state is sampled at the Stop bit of each write command, so toggling WP after the Stop condition has no effect on an ongoing write cycle. This feature enables permanent locking of critical configuration data post-manufacturing, and the 24AA512T-I/SN will still acknowledge write commands even when WP is active, simplifying host error-handling logic.

What package type does the 24AA512T-I/SN use, and is it compatible with standard SOIC footprints?

The 24AA512T-I/SN uses an 8-lead SOIC package designated "SN", measuring 3.90 mm wide with 1.27 mm pitch and 150 mil body width. It conforms to JEDEC MS-012 standards and is fully compatible with industry-standard SOIC-8 footprints used in automated PCB assembly. The "T" suffix indicates tape-and-reel packaging, and the "I" denotes industrial temperature grade (−40°C to +85°C). This package is distinct from TSSOP, DFN, or CSP variants offered for the same part number family.

Can multiple 24AA512T-I/SN devices share the same I²C bus, and how is addressing managed?

Yes, up to eight 24AA512T-I/SN devices can share a single I²C bus using the A0, A1, and A2 address pins. Each pin is hardwired to VSS or VCC to configure a unique 3-bit chip address, forming the three most significant bits of the 7-bit I²C client address (with fixed 1010 control code). This allows software to access individual devices without bus contention. The 24AA512T-I/SN does not support dynamic address assignment - all address pins must be statically configured before operation begins.

What is the page write buffer size and maximum write time for the 24AA512T-I/SN?

The 24AA512T-I/SN features a 128-byte page write buffer, enabling up to 128 bytes to be written atomically with a single Stop condition. The maximum self-timed write cycle duration is 5 ms, regardless of whether one byte or a full 128-byte page is written. This fixed timing simplifies host firmware design, as the device does not require variable delay loops. During the write cycle, the 24AA512T-I/SN does not acknowledge I²C commands, enabling reliable acknowledge polling to detect completion.