Microchip Technology 24AA16-I/STG

Overview

24AA16-I/STG 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-protection via the WP pin. It supports industrial temperature range (–40°C to +85°C) and is packaged in an 8-lead SOIC.

For engineers reviewing the 24AA16-I/STG datasheet, 24AA16-I/STG pinout, 24AA16-I/STG application, or 24AA16-I/STG equivalent, key selection criteria include low-voltage operation down to 1.7V, page-write capability (16-byte buffer), Schmitt-trigger inputs for noise immunity, self-timed erase/write cycle (5 ms max), and AEC-Q100 qualification for automotive use.

Technical Context

The 24AA16-I/STG functions as a slave device on a two-wire I²C bus, using a 7-bit slave address (1010xxxR/W) where the three block-select bits (B2–B0) define one of eight 256-word memory blocks. Its internal Address Pointer auto-increments during sequential reads and after each byte access.

It implements hardware write protection via the WP pin: tied to VSS enables full read/write; tied to VCC disables all writes while preserving read functionality. The device uses open-drain SDA/SCL with external pull-ups and includes slope control and Schmitt-trigger inputs to suppress ground bounce and noise spikes.

Key Specifications

Pinout & Package

Package: 8-Lead SOIC (SN), 3.90 mm body width, JEDEC MS-012 variant. Pin 1 is bottom-left corner when notch faces up; exposed pad not present in SOIC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC16B-I/ST, the 24AA16-I/ST enables true 1.7V operation for battery-constrained designs, while 24AA16T-I/ST offers identical functionality in tape-and-reel format - both preserve the same 16-Kbit capacity, page-write buffer, and hardware write-protection architecture.

Availability

24AA16-I/STG is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical infusion pump settings, and smart energy meter firmware ID storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 24AA16-I/STG 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 24AA16 product line delivers cost-effective, low-power serial EEPROMs optimized for space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components and broad voltage compatibility.

FAQ

What is the maximum clock frequency supported by the 24AA16-I/STG?

The 24AA16-I/STG supports up to 400 kHz when VCC is 2.5V or higher; at 1.7V ≤ VCC < 2.5V, the maximum clock frequency is reduced to 100 kHz to maintain timing margin integrity. This dual-speed behavior is built into the device's internal timing generator and requires no software configuration - the host controller must adapt its I²C clock rate based on measured VCC.

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

Yes, the 24AA16-I/STG has open-drain SDA and SCL pins and requires external pull-up resistors. Typical values are 2 kΩ for 400 kHz operation and 10 kΩ for 100 kHz. The exact value depends on bus capacitance and rise-time requirements; Microchip recommends verifying with the formula R_PULLUP = (V_CC – 0.4 V) / 3 mA per I²C specification.

How does hardware write-protection work on the 24AA16-I/STG?

Hardware write-protection on the 24AA16-I/STG is controlled by the WP pin: when tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional. When tied to VSS, full read/write access is enabled. No internal register or command is needed - protection state is determined solely by WP voltage level at power-up and during operation.

Can the 24AA16-I/STG be used in automotive applications?

Yes, the 24AA16-I/STG is AEC-Q100 qualified for automotive applications and rated for the industrial temperature range (–40°C to +85°C). Its 1.7V operation, 1 million endurance cycles, and >200-year data retention make it suitable for body control modules, infotainment configuration storage, and ADAS subsystem calibration data - provided the WP pin is used to lock critical parameters.

What happens if a page write crosses a 16-byte boundary on the 24AA16-I/STG?

If a page write command attempts to cross a 16-byte physical page boundary (e.g., writing 17 bytes starting at address 15), the address pointer wraps around to the start of the same page (address 0), overwriting previously loaded data in that page. The 24AA16-I/STG does not auto-advance to the next page - software must enforce alignment to 16-byte boundaries or split multi-page writes manually.