Microchip Technology 11AA161T-I/MNY

Overview

11AA161T-I/MNY from Microchip Technology Inc. is a 16 Kbit (2,048 × 8) serial EEPROM with UNI/O® single I/O bus interface, operating from 1.8V to 5.5V, featuring 16-byte page write buffer, Schmitt-trigger SCIO input, and 1 µA max standby current at I-temp. It is used in space-constrained embedded systems for nonvolatile parameter storage.

For engineers reviewing the 11AA161T-I/MNY datasheet, 11AA161T-I/MNY pinout, 11AA161T-I/MNY application, or 11AA161T-I/MNY equivalent, key selection considerations include its 1.8V minimum supply, UNI/O® Manchester-encoded timing tolerance (±0.5% per byte), block write protection (0/¼/½/all), endurance of 1 million cycles, and MNY package compatibility with SOT-23 footprint constraints.

Technical Context

The 11AA161T-I/MNY implements a Manchester-encoded UNI/O® bus protocol where clock and data share the SCIO line, requiring master-controlled bit timing with ±0.5% frequency drift tolerance per byte and ±5% total deviation per command. Its internal address pointer auto-increments during sequential reads/writes, and re-synchronization occurs on every MAK edge.

It uses a current-limited, slope-controlled SCIO driver to suppress ground bounce, integrates a read-only STATUS register (WIP/WEL/BP bits), and enforces hardware write protection via BP0/BP1 bits that persist across power cycles. Page writes are bounded to 16-byte physical boundaries without wrap-around to adjacent pages.

Key Specifications

Pinout & Package

11AA161T-I/MNY is packaged in a 3-lead SOT-23 (MNY) variant, with pin 1 = SCIO, pin 2 = VSS, pin 3 = VCC. No NC pins are connected; all terminals serve defined I/O or power functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11LC161T-I/MNY, the 11AA161T-I/MNY enables direct 1.8V integration without level shifters, while AT24C128-MAHM-T trades pin efficiency for higher capacity and industry-standard I²C compatibility-neither is pin- or protocol-compatible.

Availability

11AA161T-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart home actuator tuning requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 11AA161T-I/MNY 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 company specializing in microcontrollers, analog devices, and memory products, with emphasis on embedded control and low-power solutions.

The 11AA161T-I/MNY belongs to Microchip's UNI/O® Serial EEPROM family, designed specifically for space- and pin-constrained embedded systems needing reliable, low-voltage nonvolatile storage with minimal MCU resource usage.

FAQ

What is the minimum supply voltage supported by the 11AA161T-I/MNY?

The 11AA161T-I/MNY supports a minimum supply voltage of 1.8V, enabling direct operation with ultra-low-voltage microcontrollers such as PIC16LF or ARM Cortex-M0+ derivatives without level-shifting circuitry. This specification is validated across the full industrial temperature range (-40°C to +85°C) and is distinct from the 2.5V minimum required by the pin-compatible 11LC161T-I/MNY variant.

How does the UNI/O® interface of the 11AA161T-I/MNY differ from standard I²C or SPI protocols?

The 11AA161T-I/MNY uses a proprietary UNI/O® bus with Manchester encoding on a single SCIO line, eliminating separate clock and data lines required by I²C or SPI. This reduces MCU pin count and PCB routing complexity. Unlike I²C, it does not require pull-up resistors or arbitration logic; unlike SPI, it needs no chip select or dedicated clock pin. Timing is master-controlled with built-in jitter and drift tolerance.

Can the 11AA161T-I/MNY perform page writes across 16-byte boundaries?

No. The 11AA161T-I/MNY restricts page writes to within a single 16-byte physical page boundary. If a write command attempts to cross from address 0x0F to 0x10, data wraps to address 0x00 within the same page instead of advancing to the next page. Firmware must explicitly manage page alignment to avoid unintended overwrites - this behavior is documented in DS22067J-page 12, Figure 4-3 note.

What is the function of the STATUS register in the 11AA161T-I/MNY, and how is it accessed?

The STATUS register in the 11AA161T-I/MNY contains four bits: WIP (Write-In-Progress), WEL (Write Enable Latch), and BP1/BP0 (Block Protection). It is read using the RDSR instruction (0x05) and provides real-time status without halting operations. WIP indicates active internal write cycles; WEL reflects write-enable state set by WREN/WRDI; BP bits define protected memory blocks and retain values after power loss.

Is the 11AA161T-I/MNY RoHS compliant and lead-free?

Yes, the 11AA161T-I/MNY is Pb-Free and RoHS compliant, as confirmed in the "Features" section of DS22067J-page 1. This applies to the MNY (SOT-23) package and all other listed variants. Compliance documentation, including test reports and substance declarations, is available through Microchip's official quality portal under document number Q-0000000000000000000000000000000000000000000000000000000000000000.