Microchip Technology 24AA16-E/P

Overview

24AA16-E/P from Microchip Technology is a 16-Kbit I²C-compatible serial EEPROM organized as eight 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 hardware write-protection via the WP pin. It supports page writes of up to 16 bytes and is rated for -40°C to +125°C extended temperature operation in PDIP packaging.

For engineers reviewing the 24AA16-E/P datasheet, 24AA16-E/P pinout, 24AA16-E/P application, or 24AA16-E/P equivalent, this device serves as a low-voltage, high-reliability nonvolatile memory solution for embedded configuration storage, calibration data retention, and firmware parameter logging in space-constrained industrial and automotive systems.

Technical Context

The 24AA16-E/P functions as an I²C slave device with fixed 4-bit control code '1010' and 3-bit block-select addressing, enabling access to eight independent 256-byte memory blocks. Its internal Address Pointer auto-increments during sequential reads and supports current address, random, and sequential read modes.

It implements Schmitt-trigger inputs and output slope control to suppress noise and eliminate ground bounce on shared I²C buses. Write operations are self-timed with a maximum 5 ms erase/write cycle, and acknowledge polling is supported to determine write completion without fixed delay timing.

Key Specifications

Pinout & Package

24AA16-E/P uses an 8-lead plastic dual in-line package (PDIP) with 300 mil body width. Pin 1 is index-marked; A0–A2 pins are unconnected 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 24LC16B-E/P, the 24AA16-E/P enables lower-voltage operation critical for battery-backed systems; compared with 24AA02E48-I/P, it provides 8× more memory for complex parameter sets while omitting the MAC address feature.

Availability

24AA16-E/P is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical device configuration, and smart energy meter firmware parameter storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24AA16-E/P 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 24AA16-E/P belongs to Microchip's 24XX16 family of I²C serial EEPROMs, designed specifically for robust, low-power, long-life nonvolatile data storage in space- and power-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24AA16-E/P?

The 24AA16-E/P supports up to 400 kHz when V_CC is 2.5V or higher. At V_CC between 1.7V and 2.49V, the maximum clock frequency is reduced to 100 kHz to maintain timing margin and signal integrity. This dual-speed capability allows seamless integration across 1.8V, 3.3V, and 5V platforms without redesign.

Does the 24AA16-E/P require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA16-E/P requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz. The exact value depends on bus capacitance and desired rise time, as specified in the 24AA16-E/P datasheet Section 2.2.

How does the WP pin function on the 24AA16-E/P?

The WP (Write-Protect) pin on the 24AA16-E/P is a logic-controlled hardware lock: when tied to VCC, it disables all write operations to the entire 16-Kbit memory array while permitting unrestricted reads; when tied to VSS or left floating, full read/write access is enabled. This provides fail-safe protection against firmware corruption without software dependencies.

What is the memory organization of the 24AA16-E/P?

The 24AA16-E/P organizes its 16 Kbit (2048 bytes) into eight independent 256 × 8-bit blocks. Each block is selected using the three most significant bits (B2–B0) of the I²C slave address. This segmentation allows selective access and simplifies memory management in multi-function embedded systems.

Is the 24AA16-E/P qualified for automotive applications?

Yes, the 24AA16-E/P is AEC-Q100 qualified for automotive applications and rated for the extended temperature range of -40°C to +125°C. Its 1.7V–5.5V operation, >4 kV ESD rating, and 1 million endurance cycles meet stringent requirements for body electronics, infotainment, and ADAS subsystems.