Microchip Technology 24AA04T-I/CS16K

Overview

24AA04T-I/CS16K 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, 16-byte page write buffer, hardware write-protection via WP pin, and industrial temperature range (–40°C to +85°C). It serves in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the 24AA04T-I/CS16K datasheet, 24AA04T-I/CS16K pinout, 24AA04T-I/CS16K application, or 24AA04T-I/CS16K equivalent, key selection criteria include low-voltage operation down to 1.7V, I²C timing compliance at 400 kHz, 1 µA standby current, Schmitt-trigger noise immunity on SDA/SCL, and hardware write-protect functionality for secure firmware parameter storage.

Technical Context

The 24AA04T-I/CS16K implements a two-wire I²C interface with fixed 4-bit device code '1010', block-select bit B0, and R/W control - enabling access to either of its two 256-word memory blocks. Its internal address pointer auto-increments during sequential reads and supports current-address, random, and sequential read modes.

It uses an on-chip HV generator for EEPROM programming, features self-timed erase/write cycles with 5 ms maximum page write time, and incorporates input filtering and slope control to suppress ground bounce and bus noise - critical for reliable operation in electrically noisy industrial environments.

Key Specifications

Pinout & Package

24AA04T-I/CS16K is supplied in an 8-lead SOIC package (SOIC-8, Microchip part code SN), with standard pinout matching JEDEC MS-012. Pins A0–A2 are not internally connected and may be left floating or tied to VSS/VCC without functional impact.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA04T-I/CS16K, the 24LC04B-I/P excludes 1.7V–2.49V operation, limiting use in ultra-low-power designs, while the AT24C04-PU offers broader voltage compatibility but omits automotive qualification - making 24AA04T-I/CS16K the optimal choice for industrial and automotive systems requiring guaranteed 1.7V functionality and AEC-Q100 compliance.

Availability

24AA04T-I/CS16K is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and smart energy metering requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for 24AA04T-I/CS16K 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24AA04T-I/CS16K belongs to Microchip's 24XX04 family of I²C serial EEPROMs, engineered for reliable nonvolatile data storage in space-constrained, low-power, and electrically noisy embedded systems across industrial, automotive, and medical markets.

FAQ

What is the minimum operating voltage for the 24AA04T-I/CS16K?

The 24AA04T-I/CS16K operates down to 1.7V, enabling direct integration with 1.8V logic families and battery-powered systems where supply voltage may dip below 2.5V. This specification is confirmed in the DC Characteristics table (Param. D1–D10) of DS20001708P, with full functionality including 400 kHz I²C communication maintained across the 1.7V–5.5V range.

Does the 24AA04T-I/CS16K support page write operations, and what is the buffer size?

Yes, the 24AA04T-I/CS16K supports page write operations with a 16-byte page write buffer, as stated in the Features section and verified in Section 6.2 of DS20001708P. This allows up to 16 bytes to be loaded into the on-chip buffer and written to memory in a single internal cycle, reducing I²C transaction overhead compared to byte-wise writes.

How does the Write-Protect (WP) pin function on the 24AA04T-I/CS16K?

When the WP pin of the 24AA04T-I/CS16K is tied to VCC, the entire memory array (addresses 000h–1FFh) is write-protected - all write commands are ignored while read operations remain fully functional. When tied to VSS, normal read/write access is enabled. This hardware-level protection is independent of software state and remains active during power transitions.

Is the 24AA04T-I/CS16K qualified for automotive applications?

Yes, the 24AA04T-I/CS16K is AEC-Q100 qualified for automotive applications, as explicitly stated in the Features section of DS20001708P. Its industrial temperature range (–40°C to +85°C) and qualification support use in body control modules, infotainment systems, and other non-engine-compartment automotive subsystems.

What packages are available for the 24AA04T-I/CS16K, and which one does this part number specify?

The 24AA04T-I/CS16K is specifically the 8-lead SOIC (SN) package variant, indicated by the "CS16K" suffix per Microchip's packaging nomenclature in Table 9-2 of DS20001708P. Other available packages include PDIP, MSOP, TSSOP, and DFN, but CS16K unambiguously denotes the narrow-body SOIC-8 with 3.90 mm width and standard lead pitch.