Microchip Technology 24AA04T-I/ST

Overview

24AA04T-I/ST 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 supports page writes up to 16 bytes and hardware write-protection via the WP pin, used for configuration storage in microcontroller-based embedded systems.

For engineers reviewing the 24AA04T-I/ST datasheet, 24AA04T-I/ST pinout, 24AA04T-I/ST application, or 24AA04T-I/ST equivalent, this page delivers verified electrical specs, SOIC-8 package details, I²C timing compliance at 1.7V–5.5V, endurance (1M cycles), and data retention (>200 years) - all confirmed from Microchip DS20001708P.

Technical Context

The 24AA04T-I/ST implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while ACK polling allows host-driven write-cycle completion detection without fixed delays.

It uses an on-chip HV generator for EEPROM programming and features a 16-byte page write buffer with self-timed erase/write cycles. The A0–A2 pins are unconnected (NC), simplifying PCB layout; device addressing relies solely on the fixed 4-bit control code '1010' and block-select bit B0.

Key Specifications

Pinout & Package

24AA04T-I/ST is supplied in an 8-lead SOIC (SN) package per Microchip drawing C04-057-SN Rev F, with 3.90 mm body width, 1.27 mm pitch, and gull-wing leads. 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 EEPROM applications.

Compared with 24AA04T-I/ST, the 24LC04B-I/ST trades low-voltage capability for marginally lower unit cost, while the 24FC04T-I/ST adds 2.5× clock speed and extended temperature range at higher price - making the 24AA04T-I/ST optimal for cost-sensitive 1.8V–5V industrial and consumer designs.

Availability

24AA04T-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance settings, and medical device configuration requiring stable component supply, RoHS-compliant packaging, and long-term manufacturing continuity.

Supply support for 24AA04T-I/ST 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 24AA04T-I/ST belongs to Microchip's 24XX04 family of I²C EEPROMs, designed specifically for low-power, space-constrained embedded systems needing reliable, byte-addressable nonvolatile storage with minimal external components.

FAQ

What is the maximum I²C clock frequency supported by the 24AA04T-I/ST?

The 24AA04T-I/ST supports up to 400 kHz when VCC is 2.5V or higher. At 1.7V ≤ VCC < 2.5V, the maximum clock frequency drops to 100 kHz to ensure timing margin. This dual-speed behavior is explicitly defined in Table 1-2 of the DS20001708P datasheet and applies directly to the 24AA04T-I/ST variant.

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

Yes, the 24AA04T-I/ST requires external pull-up resistors on both SDA and SCL because its I²C interface uses open-drain outputs. Typical values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz, as specified in Section 2.2 of DS20001708P. Failure to install pull-ups will prevent proper bus communication.

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

When WP is tied to VCC, the entire 4-Kbit memory array (addresses 000h–1FFh) is write-inhibited; reads remain fully functional. When WP is tied to VSS (or left floating, though not recommended), normal read/write access is enabled. This hardware-level protection is active regardless of I²C command state and is confirmed in Section 2.4 and Figure 6-1 of DS20001708P.

What is the endurance rating of the 24AA04T-I/ST, and under what conditions is it specified?

The 24AA04T-I/ST is rated for 1,000,000 erase/write cycles at +25°C and 5.5V, measured in page mode per Note 4 in Table 1-2 of DS20001708P. This endurance value is guaranteed across the industrial temperature range (–40°C to +85°C) and applies to both byte and page write operations.

Are the A0, A1, and A2 pins functional on the 24AA04T-I/ST?

No - the A0, A1, and A2 pins are not internally connected in the 24AA04T-I/ST. As stated in Section 2.1 and Table 2-1 of DS20001708P, they may be left floating or tied to VSS/VCC without affecting device operation. This distinguishes the 24AA04T-I/ST from higher-density Microchip EEPROMs that use these pins for device addressing.