Microchip Technology 24AA08H-I/SN

Overview

24AA08H-I/SN from Microchip Technology Inc. is an 8 Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit blocks, operating down to 1.7 V with 1 µA standby current and 1 mA read current. It features hardware write-protection for the upper half-array (200h–3FFh), 16-byte page write buffer, and Schmitt-trigger inputs for noise immunity - deployed in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the 24AA08H-I/SN datasheet, 24AA08H-I/SN pinout, 24AA08H-I/SN application, or 24AA08H-I/SN equivalent, key selection criteria include low-voltage operation (1.7–5.5 V), industrial temperature range (−40°C to +85°C), I²C clock compatibility up to 400 kHz, and half-array write-protect functionality via the WP pin.

Technical Context

The 24AA08H-I/SN implements a slave-only I²C interface with fixed 4-bit device code '1010' and 3-bit block-select addressing, enabling access to four independent 256-word memory blocks. Its internal address pointer supports current-address, random, and sequential read modes, while acknowledge polling allows bus-efficient write-cycle completion detection.

Write protection is implemented via a dedicated WP pin: tied to VCC, it disables writes to addresses 200h–3FFh; tied to VSS, full array access is enabled. All pins A0–A2 are unconnected - no external pull-up/down required - and SDA/SCL incorporate integrated Schmitt triggers and input filters for robustness on noisy buses.

Key Specifications

Pinout & Package

24AA08H-I/SN is supplied in an 8-lead plastic SOIC (3.90 mm body) package per JEDEC MS-012, with gull-wing leads and RoHS-compliant matte tin finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC08BH-I/SN, the 24AA08H-I/SN enables lower-voltage operation critical for modern ultra-low-power designs; versus AT24C08D-SSHM-T, it provides deterministic hardware write protection essential for safety-critical parameter storage.

Availability

24AA08H-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration retention, and medical device parameter archiving requiring stable component supply across extended production lifecycles.

Supply support for 24AA08H-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, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA08H product line delivers cost-optimized, low-voltage serial EEPROMs targeting industrial, medical, and consumer applications where reliability, long data retention, and I²C simplicity are critical.

FAQ

What is the minimum operating voltage for the 24AA08H-I/SN?

The 24AA08H-I/SN operates down to 1.7 V, making it compatible with 1.8 V logic systems and battery-powered devices. Below 2.5 V, its maximum I²C clock frequency is limited to 100 kHz to ensure timing margin. This low-voltage capability is a key differentiator from the 24LC08BH series, which requires ≥2.5 V. The 24AA08H-I/SN maintains full functionality-including page writes and write protection-across its entire 1.7–5.5 V range.

Does the 24AA08H-I/SN require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA08H-I/SN requires external pull-up resistors on both SDA and SCL because these pins are open-drain. For 400 kHz operation, a 2 kΩ pull-up to VCC is recommended; for 100 kHz, 10 kΩ is typical. The internal Schmitt trigger inputs and slew-rate control eliminate ground bounce and improve noise immunity, but do not replace the need for proper bus termination. These resistors ensure valid logic levels and meet I²C specification rise-time requirements.

How does the hardware write-protection feature work on the 24AA08H-I/SN?

The 24AA08H-I/SN uses the WP pin to enable hardware write-protection for memory addresses 200h–3FFh (upper half-array). When WP is tied to VCC, writes to that region are blocked while reads remain fully functional. When WP is tied to VSS, full array access is permitted. This feature is implemented entirely in hardware - no firmware intervention or command sequence is needed. The 24AA08H-I/SN does not support byte-level or software-controlled protection.

What is the page write buffer size of the 24AA08H-I/SN, and how does it affect performance?

The 24AA08H-I/SN has a 16-byte page write buffer, allowing up to 16 contiguous bytes to be written in a single I²C transaction. This reduces the number of required Start/Stop conditions and ACK handshakes versus byte-wise writes, cutting total write time by up to 85% for aligned 16-byte updates. Page writes are constrained to physical boundaries - crossing a 16-byte boundary causes wraparound - so firmware must align writes or split across pages. The 24AA08H-I/SN completes each page write in ≤5 ms.

Is the 24AA08H-I/SN compatible with standard I²C protocols and controllers?

Yes, the 24AA08H-I/SN is fully compliant with standard I²C protocol specifications, including START/STOP condition generation, 7-bit slave addressing (device code 1010xxx), and ACK/NACK signaling. It supports standard-mode (100 kHz) and fast-mode (400 kHz) clock rates, and its Schmitt-trigger inputs and input filters ensure robust operation on electrically noisy buses. No special controller extensions or custom drivers are required - it functions identically to any standard I²C EEPROM in existing firmware stacks.