Microchip Technology 24AA08-I/SN

Overview

24AA08-I/SN from Microchip Technology Inc. is an 8-Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit blocks, operating from 1.7V to 5.5V with 400 kHz max clock frequency (100 kHz below 2.5V), 1 µA standby current, and industrial temperature range (–40°C to +85°C). It supports 16-byte page writes and hardware write-protection via the WP pin, used in embedded system configuration storage and sensor calibration data retention.

For engineers reviewing the 24AA08-I/SN datasheet, 24AA08-I/SN pinout, 24AA08-I/SN application, or 24AA08-I/SN equivalent, key selection criteria include low-voltage operation down to 1.7V, I²C bus compatibility at 400 kHz, 16-byte page buffer size, hardware write-protect functionality, and SOIC-8 (SN) package compatibility with standard PCB footprints.

Technical Context

The 24AA08-I/SN implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes a 16-byte page latch, address pointer, and HV generator for EEPROM programming, enabling self-timed erase/write cycles without external timing components.

It uses a fixed 4-bit device identifier (1010b) with 2-bit block select (B1/B0) and R/W bit for addressing four 256-word memory blocks. Write protection is implemented via dedicated WP pin logic that disables all write operations when pulled high, independent of I²C command sequence.

Key Specifications

Pinout & Package

24AA08-I/SN is supplied in an 8-Lead Plastic Small Outline (SOIC-N) package, 3.90 mm body width, with gull-wing leads and standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC08B-I/SN, 24AA08-I/SN adds 1.7V operation for ultra-low-power systems; compared with 24FC08-I/SN, it trades 1 MHz speed for broader legacy I²C timing compatibility and lower system-level timing validation effort.

Availability

24AA08-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration memory, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 24AA08-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 microcontroller, analog, and Flash-IP solutions, delivering differentiated silicon and development tools for embedded control applications.

The 24AA08-I/SN belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in space- and cost-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24AA08-I/SN?

The 24AA08-I/SN supports up to 400 kHz when VCC ≥ 2.5V, and 100 kHz when VCC is between 1.7V and 2.49V. This dual-speed capability ensures interoperability across 1.8V, 3.3V, and 5V host systems while maintaining signal integrity at lower voltages. The 24AA08-I/SN does not support 1 MHz operation - that capability is exclusive to the 24FC08 variant.

Does the 24AA08-I/SN require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA08-I/SN requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Recommended values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz. These resistors ensure proper bus voltage levels and rise times per I²C specification, and their value directly impacts maximum achievable clock frequency and noise immunity.

How does hardware write-protection work on the 24AA08-I/SN?

Hardware write-protection on the 24AA08-I/SN is controlled by the WP pin: when tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional; when tied to VSS, full read/write access is enabled. This logic-level protection is active independently of I²C commands and provides deterministic, non-software-dependent memory lock - critical for safety-critical or tamper-resistant applications.

What is the memory organization of the 24AA08-I/SN?

The 24AA08-I/SN contains 8 Kbit (1024 bytes) of EEPROM organized into four independent 256-word blocks (000h–0FFh, 100h–1FFh, 200h–2FFh, 300h–3FFh). Block selection is performed using bits B1 and B0 in the I²C control byte, enabling segmented access control and isolation of configuration data across subsystems without software address management overhead.

Can the 24AA08-I/SN be used in automotive applications?

Yes, the 24AA08-I/SN is AEC-Q100 qualified for automotive applications and rated for industrial temperature range (–40°C to +85°C). While not explicitly labeled "automotive grade" in part number, its qualification status, 1M endurance, 200-year data retention, and robust I²C interface with Schmitt-trigger inputs make it suitable for body electronics, infotainment configuration storage, and sensor calibration in passenger vehicles - provided system-level EMI and thermal design comply with ISO 16750.