Microchip Technology 11AA010-I/W16K

Overview

11AA010-I/W16K from Microchip Technology Inc. is a 1 Kbit (128 × 8) serial EEPROM with UNI/O® single I/O bus interface, operating from 1.8V to 5.5V, featuring 16-byte page write buffer, 1 µA max standby current (I-temp), and Schmitt-trigger SCIO input for noise immunity in space-constrained embedded systems.

For engineers reviewing the 11AA010-I/W16K datasheet, 11AA010-I/W16K pinout, 11AA010-I/W16K application, or 11AA010-I/W16K equivalent, key selection considerations include its 1.8V low-voltage operation, 100 kbps Manchester-encoded serial interface, industrial temperature range (−40°C to +85°C), and 3-lead SOT-23/W16K package compatibility with board-level space constraints and legacy through-hole footprint transitions.

Technical Context

The 11AA010-I/W16K implements a Manchester-encoded, single-wire UNI/O® protocol where clock and data share the SCIO line, enabling synchronization via start-header timing and dynamic re-synchronization on MAK edges to tolerate ±0.50% frequency drift per byte and ±0.06 UI edge jitter. It uses internal address pointer auto-increment for sequential reads and wraps page writes within fixed 16-byte boundaries.

Its architecture integrates a current-limited slope-controlled SCIO driver (±3 mA at 2.5V), STATUS register with WIP/WEL/BP bits, and hardware write protection logic that enforces block protection (none/¼/½/all) and power-on data integrity via built-in write-enable latch control and auto-erase during self-timed write cycles.

Key Specifications

Pinout & Package

11AA010-I/W16K is packaged in a 3-lead SOT-23 (W16K) variant, with SCIO serving as bidirectional serial clock/data line, VCC as supply input, and VSS as ground reference. No NC pins are present in this 3-pin configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11LC010-I/P, the 11AA010-I/W16K enables lower-voltage operation and smaller footprint, while versus AT24C01D-SSHM-T it trades I²C ubiquity for reduced pin count and enhanced noise resilience - making it optimal for new 1.8V embedded designs prioritizing layout simplicity and robustness.

Availability

11AA010-I/W16K is available at Aetrix Electronics and suitable for smart sensor calibration storage, IoT edge device configuration, and industrial PLC I/O module settings requiring stable component supply and long-term obsolescence management.

Supply support for 11AA010-I/W16K 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, and memory products, with global manufacturing and quality certifications including ISO 9001 and AEC-Q200 for automotive-grade parts.

The 11AA010-I/W16K belongs to Microchip's 11XX UNI/O® Serial EEPROM family, designed specifically for space- and power-constrained embedded systems needing simple, robust, single-wire nonvolatile storage with industrial temperature reliability.

FAQ

What is the minimum supply voltage required for reliable operation of the 11AA010-I/W16K?

The 11AA010-I/W16K operates reliably down to 1.8V across its full industrial temperature range (−40°C to +85°C). Below 2.5V, DC specifications such as input threshold (VIL = 0.2×VCC) and output drive (±3 mA) are guaranteed per DS22067J-page 3 Table 1-1. This 1.8V capability enables direct interfacing with modern ultra-low-power MCUs without level-shifting circuitry, distinguishing it from the 2.5V-minimum 11LC010 series.

How does the UNI/O® interface of the 11AA010-I/W16K differ from standard I²C or SPI protocols?

The 11AA010-I/W16K uses Manchester-encoded single-wire UNI/O®, combining clock and data on the SCIO line - unlike I²C (two wires) or SPI (three or four wires). This eliminates dedicated clock lines and reduces MCU pin usage. Communication relies on precise timing of start headers, MAK/NoMAK handshaking, and slave-side re-synchronization, tolerating ±0.50% frequency drift per byte. The protocol is software-implemented on most MCUs using GPIO bit-banging.

Can the 11AA010-I/W16K be used in applications requiring write protection of specific memory regions?

Yes. The 11AA010-I/W16K includes a STATUS register with BP0/BP1 bits enabling hardware block write protection of none, 1/4, 1/2, or all of the 128-byte array. Protection is nonvolatile and persists across power cycles. Unlike software-based locking, this feature prevents accidental or malicious writes even during brownout conditions, making it suitable for safeguarding calibration data or safety-critical parameters in industrial and medical devices.

What is the maximum bit rate supported by the 11AA010-I/W16K, and how is timing enforced?

The 11AA010-I/W16K supports a maximum serial bus frequency of 100 kHz (equivalent to 100 kbps), with bit period (TE) ranging from 10 µs to 100 µs. Timing is enforced via Manchester encoding and slave-side re-synchronization on every MAK edge, tolerating ±0.06 UI input jitter and ±0.50% frequency drift per byte. The master controls timing; the slave dynamically adjusts its internal clock reference to match, ensuring reliable communication despite MCU clock inaccuracies or thermal drift.

Is the 11AA010-I/W16K compatible with the same PCB footprint as other 3-lead SOT-23 EEPROMs?

Yes. The 11AA010-I/W16K in W16K package conforms to standard 3-lead SOT-23 mechanical dimensions (JEDEC MO-178AA), with pin 1 = SCIO, pin 2 = VSS, pin 3 = VCC. Its pinout matches industry-standard 3-pin serial EEPROM footprints, enabling drop-in replacement in layouts designed for compatible devices - provided the host firmware supports UNI/O® protocol rather than I²C or Microwire.