Microchip Technology 24AA04T-I/MS

Overview

24AA04T-I/MS from Microchip Technology Inc. is a 4-Kbit I²C-compatible serial EEPROM organized as two 256 × 8-bit blocks, operating from 1.7V to 5.5V with 400 kHz max clock frequency, 1 µA standby current, and industrial temperature range (–40°C to +85°C). It features hardware write-protection, 16-byte page write buffer, and Schmitt-trigger inputs for noise immunity - deployed in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the 24AA04T-I/MS datasheet, 24AA04T-I/MS pinout, 24AA04T-I/MS application, or 24AA04T-I/MS equivalent, key selection considerations include I²C voltage compatibility down to 1.7V, WP-controlled full-array write protection, 5 ms max page write time, endurance of 1 million cycles, and MSOP-8 packaging for space-constrained PCB layouts.

Technical Context

The 24AA04T-I/MS implements a two-wire I²C interface with fixed 4-bit device code '1010', block-select bit B0, and R/W control - supporting byte and page writes without external address pins (A0–A2 are NC). Its internal address pointer auto-increments during sequential reads and wraps within 256-word blocks.

It uses on-chip high-voltage generation for EEPROM programming, integrates slope-controlled outputs to suppress ground bounce, and employs Schmitt-trigger inputs with 50 ns spike filtering and 0.05 VCC hysteresis - enabling reliable operation on noisy industrial buses at 100 kHz (VCC < 2.5V) or 400 kHz (VCC ≥ 2.5V).

Key Specifications

Pinout & Package

24AA04T-I/MS is supplied in an 8-lead MSOP package (Microchip package code MS), measuring 3.0 mm × 3.0 mm × 1.0 mm, with gull-wing leads and wettable flanks for automated optical inspection (AOI) and solder-joint reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA04T-I/MS, the 24LC04B-I/MS lacks 1.7V operation but shares identical packaging and timing - while the AT24C04-MAHM-T enables higher throughput but mandates mechanical redesign, making 24AA04T-I/MS optimal for space-constrained 1.8V–5V designs requiring proven industrial reliability.

Availability

24AA04T-I/MS is available at Aetrix Electronics and suitable for smart meter configuration storage, industrial sensor calibration data retention, and medical device parameter backup requiring stable component supply across extended product lifecycles.

Supply support for 24AA04T-I/MS 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, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24AA04T-I/MS belongs to Microchip's serial EEPROM product line, engineered for robust, low-power, I²C-based nonvolatile storage in industrial, automotive, and medical applications where data integrity and long-term reliability are critical.

FAQ

What is the minimum operating voltage for the 24AA04T-I/MS?

The 24AA04T-I/MS operates down to 1.7V, enabling direct interface with 1.8V logic families and ultra-low-power microcontrollers without level translation. This is confirmed in the DC Characteristics table (D1–D10) of DS20001708P, where VCC min is specified as 1.7V for industrial temperature range operation.

Does the 24AA04T-I/MS require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA04T-I/MS has open-drain SDA and SCL pins and requires external pull-up resistors. Typical values are 10 kΩ for 100 kHz, 2 kΩ for 400 kHz, and 1 kΩ for 1 MHz operation - though the 24AA04T-I/MS itself is rated only to 400 kHz per its datasheet specifications.

How does the Write-Protect (WP) pin function on the 24AA04T-I/MS?

When WP is tied to VCC, the entire 4-Kbit memory array (addresses 000h–1FFh) is write-protected; read operations remain fully functional. When WP is tied to VSS or left floating, normal read/write access is enabled. This behavior is defined in Section 2.4 and Figure 6-3 of DS20001708P.

What is the maximum page write size supported by the 24AA04T-I/MS?

The 24AA04T-I/MS supports a 16-byte page write buffer, allowing up to 16 bytes to be loaded into the on-chip latch before initiating the internal 5 ms write cycle. Page boundaries align to 16-byte offsets (00h, 10h, 20h, etc.), and crossing boundaries causes wraparound within the same page.

Is the 24AA04T-I/MS qualified for automotive applications?

The 24AA04T-I/MS is not AEC-Q100 qualified; however, the broader 24AA04 family includes AEC-Q100 Grade 2 variants (e.g., 24AA04HT-I/MS). The 24AA04T-I/MS is rated for industrial temperature range (–40°C to +85°C) and RoHS compliance, making it suitable for under-hood-adjacent or cabin electronics where full automotive qualification is not mandated.