Microchip Technology 11AA020T-I/MNY

Overview

11AA020T-I/MNY from Microchip Technology Inc. is a 2 Kbit (256 × 8) serial EEPROM with single I/O UNI/O® 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 industrial control and sensor calibration applications.

For engineers reviewing the 11AA020T-I/MNY datasheet, 11AA020T-I/MNY pinout, 11AA020T-I/MNY application, or 11AA020T-I/MNY equivalent, this page delivers verified electrical specs, UNI/O® timing constraints, package-specific terminal mapping, real-world use scenarios, and two validated alternative parts with documented functional and layout implications.

Technical Context

The 11AA020T-I/MNY implements Manchester-encoded UNI/O® protocol over a single bidirectional SCIO line, eliminating need for separate clock and data lines. It uses internal re-synchronization circuitry tolerant to ±0.50% bus frequency drift per byte and ±0.06 UI edge jitter, enabling robust communication with low-cost GPIO-based masters.

Its architecture includes a nonvolatile STATUS register with Write-In-Progress (WIP) and Write-Enable Latch (WEL) bits, block write protection (BP0/BP1) covering 0%, 25%, 50%, or 100% of memory, and auto-erase before write - all managed via 8-bit command set including READ (0x03), WRITE (0x6C), WREN (0x96), and RDSR (0x05).

Key Specifications

Pinout & Package

11AA020T-I/MNY is packaged in 3-lead SOT-23 (MNY suffix), with SCIO as bidirectional serial I/O, VCC as supply input, and VSS as ground reference. No NC pins are present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02C-SSHM-T and 24AA02E48-I/MS, the 11AA020T-I/MNY uniquely delivers single-pin UNI/O® operation with built-in noise suppression and page buffering - making it the only option that preserves minimal GPIO count while maintaining industrial-grade reliability in electrically noisy environments.

Availability

11AA020T-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart home actuator memory requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 11AA020T-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 manufacturer specializing in microcontrollers, analog devices, and memory products for industrial, automotive, and consumer applications.

The 11AA020T-I/MNY belongs to Microchip's 11AAxxx UNI/O® serial EEPROM family, designed specifically to reduce pin count and PCB complexity in cost-sensitive, space-constrained embedded systems requiring nonvolatile storage.

FAQ

What is the UNI/O® interface used by the 11AA020T-I/MNY, and how does it differ from I²C or SPI?

The 11AA020T-I/MNY uses Microchip's patented UNI/O® bus - a single-wire, Manchester-encoded serial interface where clock and data are combined into one SCIO signal. Unlike I²C (2-wire, open-drain) or SPI (4-wire, separate clock/data), UNI/O® eliminates dedicated clock lines and requires only one GPIO pin plus VCC/VSS. This reduces routing complexity and enables use in 3-pin SOT-23 packages like the 11AA020T-I/MNY, while maintaining deterministic timing via master-controlled bit periods and slave re-synchronization.

Can the 11AA020T-I/MNY operate reliably at 1.8V, and what are the key DC characteristics at that voltage?

Yes, the 11AA020T-I/MNY is fully specified for 1.8V operation (minimum VCC). At 1.8V, its active read current is ≤1 mA, standby current is ≤1 µA (I-temp), VIH is 0.2×VCC (≤0.36V), and VOL is ≤0.4V at 200 µA sink. These values ensure compatibility with 1.8V logic families and enable direct connection to low-voltage MCUs without level translation - a key advantage confirmed in DS22067J Table 1-1 and Section 1.0 Electrical Characteristics.

How does the 11AA020T-I/MNY handle write protection, and can it be configured to protect only part of the memory array?

The 11AA020T-I/MNY implements hardware block write protection via two nonvolatile BP0/BP1 bits in its STATUS register. These bits - set using the WRSR command - allow selection of four protection modes: no protection (00), lower 1/4 (01), lower 1/2 (10), or full array (11). For the 2 Kbit 11AA020T-I/MNY, "lower 1/4" protects addresses 0x000–0x03F (64 bytes), enabling secure storage of calibration constants while leaving remaining memory freely writable - as defined in DS22067J Section 4.5 and Table 6-1.

What is the maximum write speed and timing behavior of the 11AA020T-I/MNY during a page write operation?

The 11AA020T-I/MNY supports up to 16-byte page writes with a maximum write cycle time of 10 ms (for ERAL/SETAL) or 5 ms (for byte/page writes), per DS22067J Table 1-2 Parameter 13. During write, the WIP bit in the STATUS register goes high and remains asserted until completion. Host firmware must poll RDSR (0x05) and wait for WIP = 0 before initiating next operation - no fixed delays required. The device automatically handles erase-before-write and internal timing, ensuring deterministic behavior across voltage and temperature.

Is the 11AA020T-I/MNY pin-compatible with other members of the 11AAxxx family, such as the 11AA010 or 11AA040?

Yes, the 11AA020T-I/MNY shares identical pinout, package (3-lead SOT-23), and UNI/O® command set with all 11AAxxx variants including 11AA010 (1 Kbit) and 11AA040 (4 Kbit). All use SCIO/VSS/VCC pin assignments and respond to the same device address (0xA0). Density differences affect only memory map size - not electrical interface or timing - allowing seamless upgrade/downgrade in existing designs without PCB changes, as confirmed in DS22067J Device Selection Table and Pin Function Table.