Microchip Technology 24AA16H-I/SN

Overview

24AA16H-I/SN from Microchip Technology Inc. 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-protect for the upper half-array (400h–7FFh). It is used in embedded systems for parameter storage, calibration data retention, and configuration backup.

For engineers reviewing the 24AA16H-I/SN datasheet, 24AA16H-I/SN pinout, 24AA16H-I/SN application, or 24AA16H-I/SN equivalent, key selection criteria include low-voltage operation down to 1.7V, industrial temperature range (−40°C to +85°C), SOIC-8 packaging, half-array write-protection via WP pin, and compatibility with standard I²C bus timing including Schmitt-trigger inputs and slope-controlled outputs.

Technical Context

The 24AA16H-I/SN functions as an I²C slave device with fixed 4-bit control code '1010' and 3-bit block-select addressing, supporting up to eight 256-word memory blocks. Its internal Address Pointer auto-increments during sequential reads and page writes.

It implements self-timed erase/write cycles with a 16-byte page buffer, Acknowledge polling for write-cycle completion detection, and noise suppression via Schmitt-trigger inputs and input filters (≤50 ns spike rejection). The WP pin enables hardware-level protection of addresses 400h–7FFh when tied to VCC.

Key Specifications

Pinout & Package

24AA16H-I/SN is supplied in an 8-lead narrow SOIC package (SN), measuring 3.90 mm × 4.90 mm × 1.25 mm (max height), with gull-wing leads on 1.27 mm pitch and JEDEC-standard footprint (Microchip drawing C04-057-SN Rev D).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC16BH-I/SN, the 24AA16H-I/SN enables lower-voltage operation critical for battery-powered designs, while AT24C16C-SSHM-T offers higher bandwidth at the cost of potential firmware adaptation for address translation.

Availability

24AA16H-I/SN is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, automotive body control modules, and medical device logging requiring stable component supply across extended product lifecycles.

Supply support for 24AA16H-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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA16H belongs to Microchip's 24XX16H family of I²C serial EEPROMs designed specifically for reliable, low-power, long-life nonvolatile data storage in space-constrained industrial and automotive applications.

FAQ

What is the maximum I²C clock frequency supported by the 24AA16H-I/SN?

The 24AA16H-I/SN supports up to 400 kHz when VCC is 2.5V or higher. At supply voltages between 1.7V and 2.49V, the maximum clock frequency is reduced to 100 kHz to ensure timing margin compliance. This dual-speed capability allows seamless integration into both legacy and modern I²C systems without external clock dividers or protocol translation. The 24AA16H-I/SN automatically adapts to the applied VCC level.

How does the WP pin function on the 24AA16H-I/SN?

On the 24AA16H-I/SN, the WP (Write-Protect) pin enables hardware-level memory protection: when tied to VCC, writes to addresses 400h–7FFh (upper half-array) are inhibited while reads remain fully functional; when tied to VSS or left floating, full read/write access is enabled. This feature provides fail-safe protection for critical calibration or security data without firmware overhead. The 24AA16H-I/SN does not require external pull-up or pull-down resistors on WP.

What package type does the 24AA16H-I/SN use, and what are its key mechanical dimensions?

The 24AA16H-I/SN uses an 8-lead narrow SOIC package designated SN, with body dimensions of 3.90 mm × 4.90 mm × 1.25 mm (max height), 1.27 mm lead pitch, and gull-wing leads conforming to JEDEC MS-012. Its land pattern matches Microchip drawing C04-2057-SN Rev B, ensuring compatibility with standard PCB assembly processes and automated optical inspection. The SN package is RoHS-compliant and rated for industrial temperature operation.

Can the 24AA16H-I/SN be used in automotive applications?

Yes - the 24AA16H-I/SN is AEC-Q100 qualified for automotive applications and operates reliably across the industrial temperature range (−40°C to +85°C). Its 1.7V minimum supply voltage supports start-stop battery conditions, and >4 kV HBM ESD rating enhances resilience in vehicle electrical environments. While not marketed as a dedicated automotive-grade part like the 24AA16HT variant, the 24AA16H-I/SN meets core automotive reliability requirements and is widely deployed in body control modules and infotainment subsystems.

What is the write endurance and data retention specification for the 24AA16H-I/SN?

The 24AA16H-I/SN guarantees a minimum of 1,000,000 erase/write cycles per memory location and greater than 200 years of data retention at 25°C - both validated under worst-case conditions (5.5V, page-mode writes). These specifications are measured and characterized per Microchip's Total Endurance™ model, making the 24AA16H-I/SN suitable for high-update-rate applications such as event logging, usage counters, and firmware parameter tuning in industrial and medical equipment.