Microchip Technology 24AA16T-I/OT

Overview

24AA16T-I/OT 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 serves as nonvolatile configuration storage in embedded controllers, sensor nodes, and power management ICs.

For engineers reviewing the 24AA16T-I/OT datasheet, 24AA16T-I/OT pinout, 24AA16T-I/OT application, or 24AA16T-I/OT equivalent, key selection criteria include its industrial temperature range (–40°C to +85°C), 16-byte page write buffer, Schmitt-triggered SDA/SCL inputs for noise immunity, and compatibility with standard two-wire I²C bus timing at 100/400 kHz.

Technical Context

The 24AA16T-I/OT 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, enabling efficient bulk data access without repeated address retransmission.

It implements self-timed erase/write cycles with 5 ms maximum page write time, uses on-chip HV generation for EEPROM programming, and incorporates input filtering (≤100 ns spike suppression) and slope-controlled outputs to minimize ground bounce - all while maintaining full I²C protocol compliance including Start/Stop condition detection and ACK/NACK handshaking.

Key Specifications

Pinout & Package

24AA16T-I/OT is packaged in an 8-lead SOT-23 (OT) package with exposed pad option. Pin 1 = SCL, Pin 2 = VSS, Pin 3 = SDA, Pin 4 = VCC, Pin 5 = WP. A0–A2 pins are not internally connected and may be left floating or tied to VSS/VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC16B-I/OT, the 24AA16T-I/OT enables lower-voltage operation critical for battery-backed systems; compared with 24FC16T-I/OT, it trades maximum speed for broader legacy I²C controller compatibility and relaxed timing margins.

Availability

24AA16T-I/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and embedded controller boot parameter retention requiring stable component supply across extended production lifecycles.

Supply support for 24AA16T-I/OT 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 manufacturing and support infrastructure.

The 24AA16T-I/OT belongs to Microchip's 24XX16 family of serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space-constrained embedded systems operating across industrial temperature ranges.

FAQ

What is the maximum clock frequency supported by the 24AA16T-I/OT?

The 24AA16T-I/OT supports up to 400 kHz I²C clock frequency when VCC is 2.5V or higher. At VCC between 1.7V and 2.5V, the maximum clock frequency is reduced to 100 kHz to ensure reliable timing margins. This dual-speed capability allows interoperability with both legacy and modern I²C masters while maintaining robust operation across wide supply ranges. The 24AA16T-I/OT does not support 1 MHz operation - that capability is exclusive to the 24FC16 variant.

Does the 24AA16T-I/OT require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA16T-I/OT requires external pull-up resistors on both SDA and SCL lines because these pins are open-drain. 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; insufficient pull-up strength causes timing violations and communication failures. The 24AA16T-I/OT itself does not integrate internal pull-ups, so omission of external resistors will prevent I²C bus functionality entirely.

How does the hardware write-protection (WP) pin function on the 24AA16T-I/OT?

When the WP pin of the 24AA16T-I/OT is tied to VCC, all write operations - including byte writes, page writes, and erase cycles - are inhibited across the entire 16-Kbit memory array (addresses 000h–7FFh). Read operations remain fully functional. When WP is tied to VSS or left floating, normal read/write access is enabled. This hardwired protection is independent of software commands and provides tamper-resistant locking of critical configuration data, making it ideal for factory-programmed parameters.

What is the page write capability of the 24AA16T-I/OT, and how does it improve efficiency?

The 24AA16T-I/OT features a 16-byte page write buffer, allowing up to 16 bytes to be written in a single I²C transaction followed by one internal self-timed write cycle (≤5 ms). This reduces bus overhead by eliminating 15 separate ACK/NACK sequences and stop conditions required for byte-wise writes. For example, writing 16 bytes takes one I²C packet plus 5 ms instead of 16 packets plus 16 × 5 ms - improving throughput by >90% and reducing MCU intervention time. The 24AA16T-I/OT enforces page boundaries: crossing them causes wraparound within the same physical page.

Is the 24AA16T-I/OT compatible with standard I²C protocol specifications?

Yes, the 24AA16T-I/OT is fully compliant with standard I²C protocol specifications, including Start/Stop condition generation, 7-bit slave addressing with R/W bit, ACK/NACK signaling, and clock stretching awareness. It implements standard timing parameters such as THD:STA, TSU:DAT, and TAA across its rated voltage and temperature ranges. The 24AA16T-I/OT also supports acknowledge polling to detect write completion without fixed delays - a key feature for deterministic real-time system design.