Microchip Technology 11AA160T-I/SN

Overview

11AA160T-I/SN from Microchip Technology Inc. is a 16 Kbit (2,048 × 8) serial EEPROM with single I/O UNI/O® bus interface, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features 16-byte page-write buffer, Schmitt-trigger SCIO input, output slope control, and built-in write protection for use in space-constrained embedded systems requiring nonvolatile parameter storage.

For engineers reviewing the 11AA160T-I/SN datasheet, 11AA160T-I/SN pinout, 11AA160T-I/SN application, or 11AA160T-I/SN equivalent, key selection criteria include UNI/O® bus compatibility, 1.8 V minimum operating voltage, 100 kbps bit rate, 1 µA standby current, and SOT-23-3 package footprint for low-pin-count microcontroller interfaces.

Technical Context

The 11AA160T-I/SN implements Manchester-encoded UNI/O® protocol over a single bidirectional SCIO line, eliminating need for separate clock and data lines. Its internal timing recovery circuitry synchronizes to master clock period during start header and re-synchronizes on each MAK bit to tolerate ±0.50% frequency drift per byte and ±0.06 UI edge jitter.

It integrates a status register with WIP and WEL flags, block write-protection bits (BP0/BP1), and hardware-based power-on/off write protection. Write operations are self-timed with 5–10 ms cycle time and support up to 16-byte page writes without external delay management.

Key Specifications

Pinout & Package

11AA160T-I/SN is packaged in 3-lead SOT-23 (SN suffix), with SCIO serving as bidirectional serial clock/data line, VCC as supply input, and VSS as ground reference. No NC pins present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11LC160-I/SN, the 11AA160T-I/SN enables 1.8 V operation critical for modern ultra-low-power MCUs, while versus AT24C128-MAHM-T it trades I²C ubiquity for single-wire simplicity and hardware write protection - reducing BOM count and firmware complexity in pin-limited designs.

Availability

11AA160T-I/SN is available at Aetrix Electronics and suitable for smart sensors, IoT edge devices, industrial PLC modules, and medical diagnostic instruments requiring stable component supply and long-term manufacturability.

Supply support for 11AA160T-I/SN 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 for embedded control applications.

The 11AAxxx family was designed specifically for space- and power-constrained systems needing reliable, low-pin-count nonvolatile storage - targeting applications where traditional I²C or SPI EEPROMs consume excessive board area or GPIO resources.

FAQ

What is the UNI/O® bus interface used by the 11AA160T-I/SN?

The 11AA160T-I/SN uses Microchip's patented UNI/O® bus, a single-wire, Manchester-encoded serial interface that combines clock and data on the SCIO pin. This eliminates separate clock lines and reduces host GPIO usage to one pin, making it ideal for microcontrollers with limited I/O. The 11AA160T-I/SN fully complies with UNI/O® Specification v1.0 and supports up to 100 kbps bit rate with automatic synchronization.

Does the 11AA160T-I/SN support 1.8 V operation?

Yes, the 11AA160T-I/SN operates from 1.8 V to 5.5 V, with guaranteed functionality down to 1.8 V across the industrial temperature range (–40°C to +85°C). This is a key differentiator from the 11LC160 variant, which requires a minimum 2.5 V supply. The 11AA160T-I/SN's 1 µA max standby current at 1.8 V makes it suitable for battery-powered applications.

How does write protection work on the 11AA160T-I/SN?

The 11AA160T-I/SN implements dual-layer write protection: hardware-level power-on/off circuitry prevents spurious writes during supply ramp-up/down, and software-configurable block protection via BP0/BP1 bits in the STATUS register. These bits - set using the WRSR command - allow locking 0%, 25%, 50%, or 100% of the 2,048-byte array. The 11AA160T-I/SN also requires explicit WREN instruction before any write, enforced by the WEL bit.

What is the maximum write speed and page size of the 11AA160T-I/SN?

The 11AA160T-I/SN supports up to 16-byte page writes with a typical write cycle time of 5 ms (byte or page). Its page size is fixed at 16 bytes, aligned to addresses divisible by 16 (e.g., 0x00–0x0F, 0x10–0x1F). Crossing page boundaries causes wraparound within the same page - a behavior the host firmware must manage. The 11AA160T-I/SN does not require external timing delays due to its self-timed architecture.

Is the 11AA160T-I/SN RoHS compliant and what package does it use?

Yes, the 11AA160T-I/SN is Pb-free and RoHS compliant. It is supplied in the 3-lead SOT-23 package (indicated by the "/SN" suffix), with pin 1 = SCIO, pin 2 = VSS, and pin 3 = VCC. This compact surface-mount package measures 2.9 mm × 1.6 mm × 1.1 mm and is optimized for high-density PCB layouts in space-constrained applications.