Microchip Technology 24AA08T-I/SN

Overview

24AA08T-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 features hardware write-protection via the WP pin, 16-byte page write buffer, and Schmitt-trigger inputs for noise immunity - deployed in embedded system configuration storage and sensor calibration data retention.

For engineers reviewing the 24AA08T-I/SN datasheet, 24AA08T-I/SN pinout, 24AA08T-I/SN application, or 24AA08T-I/SN equivalent, key selection considerations include its 1.7V low-voltage operation, I²C bus timing compliance at 400 kHz (with derated 100 kHz below 2.5V), 5 ms max page write time, hardware write-protect functionality, and SOIC-8 (SN) package compatibility with standard PCB footprints.

Technical Context

The 24AA08T-I/SN implements a two-wire I²C interface with fixed 4-bit device code '1010', block-select addressing (B1/B0 bits), and R/W bit control. Its internal architecture includes a 16-byte page latch, HV generator for EEPROM programming, and address pointer auto-increment logic supporting current-address, random, and sequential read modes.

It uses open-drain SDA/SCL with external pull-ups, Schmitt-trigger inputs (50 mV hysteresis minimum), and slope-controlled outputs to suppress ground bounce. Write protection is implemented via dedicated WP pin tied to VCC (full-array lock) or VSS (enabled), with no internal connection to A0/A1/A2 pins - all unused and floating-tolerant.

Key Specifications

Pinout & Package

24AA08T-I/SN is supplied in an 8-lead narrow SOIC package (SN), with 3.90 mm body width, 1.27 mm pitch, and JEDEC MS-012AC compliant 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 24LC08BT-I/SN, the 24AA08T-I/SN adds 1.7V operation for ultra-low-power systems; compared with 24FC08T-I/SN, it trades 1 MHz speed for broader legacy I²C timing compatibility and lower EMI sensitivity.

Availability

24AA08T-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 24AA08T-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 24AA08T-I/SN belongs to Microchip's 24XX08 family of I²C serial EEPROMs, designed specifically for space-constrained, low-power embedded systems requiring reliable, pin-compatible nonvolatile storage with hardware write protection.

FAQ

What is the maximum I²C clock frequency supported by the 24AA08T-I/SN?

The 24AA08T-I/SN supports up to 400 kHz when VCC is 2.5V or higher. At VCC between 1.7V and 2.5V, the maximum clock frequency is reduced to 100 kHz to maintain timing margin and signal integrity. This dual-speed capability ensures interoperability across mixed-voltage systems while preserving reliable communication.

Does the 24AA08T-I/SN require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA08T-I/SN requires external pull-up resistors on both SDA and SCL lines because these pins are open-drain. Typical values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz. The exact value depends on bus capacitance and rise-time requirements specified in the I²C standard and must be validated per target system layout.

How does the write-protect (WP) pin function on the 24AA08T-I/SN?

When the WP pin of the 24AA08T-I/SN is tied to VCC, all write operations (byte and page) to the entire 8-Kbit memory array (addresses 000h–3FFh) are inhibited; reads remain fully functional. When WP is tied to VSS, full read/write access is enabled. This hardware-level protection operates independently of software state and persists through power cycles.

Can the 24AA08T-I/SN be used in automotive applications?

Yes - the 24AA08T-I/SN is AEC-Q100 qualified for automotive use and rated for the industrial temperature range (–40°C to +85°C). While not explicitly graded for extended temperature (–40°C to +125°C), its qualification and robustness make it suitable for cabin and body-control applications where ambient temperatures remain within the I-temp specification.

What is the purpose of the A0, A1, and A2 pins on the 24AA08T-I/SN?

The A0, A1, and A2 pins on the 24AA08T-I/SN are not internally connected and serve no functional purpose. They may be left floating, tied to VSS, or tied to VCC without affecting device operation - a design feature that simplifies PCB layout and eliminates address-pin routing constraints common in other EEPROM families.