Microchip Technology 24AA512-I/S17K

Overview

24AA512-I/S17K from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C). It supports up to 400 kHz clock frequency, features 128-byte page write buffer, hardware write-protection via WP pin, and delivers ≤400 µA active current and ≤1 µA standby current. It is used in embedded systems for firmware parameter storage, calibration data retention, and configuration backup.

For engineers reviewing the 24AA512-I/S17K datasheet, 24AA512-I/S17K pinout, 24AA512-I/S17K application, or 24AA512-I/S17K equivalent, key selection considerations include its 1.7V minimum supply, Schmitt-trigger I²C inputs for noise immunity, cascading support for up to eight devices on one bus, and guaranteed >1 million erase/write cycles with >200-year data retention.

Technical Context

The 24AA512-I/S17K implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, and uses internal address pointer logic for sequential reads across the full 64K address space. Its memory array is partitioned into 128-byte pages, and write operations-byte or page-are self-timed with maximum 5 ms completion.

Hardware write protection is enforced by the WP pin sampled at the Stop bit of each write command; tying WP to VCC disables all writes while preserving read functionality. Device addressing uses A0–A2 pins to configure the three LSBs of the 7-bit client address (1010 A2 A1 A0 R/W), enabling up to eight devices on a shared bus without address conflict.

Key Specifications

Pinout & Package

The 24AA512-I/S17K is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 3.90 mm body width, compliant with JEDEC MS-012. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512-I/P, the 24AA512-I/S17K supports lower-voltage operation critical for battery-backed systems; compared with AT24C512BN-SH-T, it offers 2.5× higher endurance and Microchip's AEC-Q100 qualification, making it preferable for automotive and industrial deployments demanding extended service life.

Availability

24AA512-I/S17K is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pumps, smart energy meters, and embedded configuration storage requiring stable component supply across multi-year production cycles.

Supply support for 24AA512-I/S17K 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 company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24AA512-I/S17K belongs to Microchip's 24XX512 family of I²C serial EEPROMs, designed specifically for robust, low-power nonvolatile data storage in automotive, industrial, and medical applications where data integrity and long-term reliability are mandatory.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA512-I/S17K?

The 24AA512-I/S17K operates reliably down to 1.7V across its full industrial temperature range (−40°C to +85°C). This low-voltage capability allows direct integration with 1.8V microcontrollers and battery-powered systems without level-shifting circuitry. Below 1.7V, read/write functionality is not guaranteed per datasheet specifications, and internal charge pump operation may fail.

How does the WP pin function on the 24AA512-I/S17K, and when is it sampled?

The WP (Write-Protect) pin on the 24AA512-I/S17K is sampled at the Stop bit of every write command. When tied to VCC, it disables all write operations (byte and page) while allowing unrestricted reads. Tying WP to VSS enables full read/write access. The sampling occurs after the Stop condition is detected, ensuring deterministic protection even during partial or interrupted I²C transactions.

Can multiple 24AA512-I/S17K devices share the same I²C bus, and how is addressing managed?

Yes, up to eight 24AA512-I/S17K devices can share one I²C bus using hardware address pins A0, A1, and A2. These pins configure the three least-significant bits of the 7-bit client address (1010 A2 A1 A0 R/W), yielding eight unique addresses (0x50–0x57). Each device must have a distinct A0–A2 combination; floating these pins is not permitted and will cause bus contention.

What is the maximum page write size supported by the 24AA512-I/S17K, and what happens if more than 128 bytes are sent?

The 24AA512-I/S17K supports a maximum page write size of 128 bytes. If more than 128 bytes are transmitted before the Stop condition, the internal address counter rolls over within the same physical page, causing earlier bytes to be overwritten. Page boundaries align to 128-byte intervals (e.g., 0x0000–0x007F), so crossing a boundary results in wraparound-not automatic advancement to the next page.

Does the 24AA512-I/S17K support 1 MHz I²C clock frequency?

No, the 24AA512-I/S17K supports up to 400 kHz I²C clock frequency. Only the 24FC512 variant in the same family supports 1 MHz operation. Attempting 1 MHz communication with the 24AA512-I/S17K will result in timing violations, failed ACKs, and unreliable data transfer due to insufficient setup/hold times specified in the AC characteristics table.