Microchip Technology AT24C16AY1-10YI-1.8

Overview

AT24C16AY1-10YI-1.8 from Microchip Technology (formerly Atmel) is a 16 Kbit (2048 × 8) I²C-compatible serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8 V to 5.5 V, supports 100 kHz clock rate at 1.8 V, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage and automotive body control modules requiring nonvolatile parameter retention.

For engineers reviewing the AT24C16AY1-10YI-1.8 datasheet, AT24C16AY1-10YI-1.8 pinout, AT24C16AY1-10YI-1.8 application, or AT24C16AY1-10YI-1.8 equivalent, key selection criteria include 1.8 V minimum supply compatibility, 128-page × 16-byte page write architecture, WP-enabled hardware data lock, TSSOP/MAP package footprint constraints, and automotive-grade temperature range (−40°C to +85°C).

Technical Context

The AT24C16AY1-10YI-1.8 implements a standard two-wire I²C interface with open-drain SDA/SCL pins, Schmitt-triggered inputs for noise immunity, and bi-directional data transfer protocol compliant with I²C specification. Its internal address counter enables current-address, random-address, and sequential read modes.

Unlike smaller family members (AT24C02A/04A/08A), the AT24C16A variant disables A0–A2 device address pins-limiting bus topology to one device per I²C segment-and uses full-array write protection when WP = VCC. It supports 16-byte page writes with automatic address increment within page boundaries and self-timed 5 ms max write cycle.

Key Specifications

Pinout & Package

AT24C16AY1-10YI-1.8 is packaged in an 8-lead Miniature Array Package (MAP), 4.90 mm × 3.00 mm body, non-leaded, dual-footprint compatible with SOIC/TSSOP layouts. Pin 1 is marked by index area on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C16D-MAHM-T and M24C16-RMN6TP, the AT24C16AY1-10YI-1.8 uniquely combines hardware WP, MAP package compatibility with legacy SOIC footprints, and guaranteed 100 kHz operation at 1.8 V - making it optimal for cost-sensitive, safety-aware industrial designs where layout reuse and voltage headroom are critical.

Availability

AT24C16AY1-10YI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control units, medical device configuration, and smart energy metering requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for AT24C16AY1-10YI-1.8 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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.

The AT24CxxA EEPROM product line was designed for robust, low-power nonvolatile data storage in resource-constrained embedded systems - particularly targeting automotive, industrial, and medical applications demanding high endurance and extended temperature operation.

FAQ

What is the maximum I²C clock frequency supported by AT24C16AY1-10YI-1.8 at 1.8 V?

The AT24C16AY1-10YI-1.8 supports a maximum clock frequency of 100 kHz when operated at 1.8 V, as specified in the AC Characteristics table. This is lower than its 400 kHz capability at 2.5 V or higher, due to timing margin constraints at minimum supply voltage. The device maintains full functionality-including page writes and acknowledge polling-at this rate.

Does AT24C16AY1-10YI-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C16AY1-10YI-1.8 requires external pull-up resistors on both SDA and SCL lines because these pins are open-drain. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; for 100 kHz operation at 1.8 V, 4.7 kΩ is commonly used to ensure adequate rise time while minimizing power draw.

Can multiple AT24C16AY1-10YI-1.8 devices share the same I²C bus?

No - the AT24C16AY1-10YI-1.8 has no functional device address pins (A0–A2 are NC), so only one unit can reside on a given I²C bus. Attempting to connect multiple AT24C16AY1-10YI-1.8 devices will cause address collision and bus contention. For multi-device configurations, consider alternatives like the STMicroelectronics M24C16-RMN6TP that support dual addressing.

What happens to the AT24C16AY1-10YI-1.8 write protection when the WP pin is left floating?

The WP pin must not be left floating. Per the datasheet, WP is internally undefined in that state and may result in unpredictable write-enable behavior. It must be actively driven to either VCC (to lock the full 16K array) or GND (to allow normal read/write). A pull-down resistor (e.g., 10 kΩ to GND) is recommended if hardware lock is not required.

How does the page write function work in AT24C16AY1-10YI-1.8?

The AT24C16AY1-10YI-1.8 supports 16-byte page writes: after sending the starting word address and first data byte, the internal address counter auto-increments for up to 15 additional bytes within the same 16-byte page boundary. If more than 16 bytes are sent, the address rolls over to the start of the page - overwriting earlier data. A stop condition terminates the sequence and triggers the 5 ms internal write cycle.