Microchip Technology 11AA020T-I/SN

Overview

11AA020T-I/SN from Microchip Technology Inc. is a 2 Kbit (256 × 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 over –40°C to +85°C industrial temperature range. It is used in space-constrained embedded systems for storing calibration data, configuration settings, or firmware identifiers.

For engineers reviewing the 11AA020T-I/SN datasheet, 11AA020T-I/SN pinout, 11AA020T-I/SN application, or 11AA020T-I/SN equivalent, key selection considerations include its 1.8V minimum supply, Manchester-encoded UNI/O timing compliance, 100 kbps bit rate, built-in block write protection (0%, 25%, 50%, or 100% array), and SOT-23-3 package compatibility with low-pin-count microcontroller GPIOs.

Technical Context

The 11AA020T-I/SN implements a Manchester-encoded, master-controlled UNI/O® bus protocol on a single bidirectional SCIO line, eliminating need for separate clock and data lines. Its internal architecture includes a 16-byte page latch, STATUS register with WIP/WEL/BP bits, and re-synchronization circuitry tolerant to ±0.50% frequency drift per byte and ±0.06 UI edge jitter.

It uses low-power CMOS with slope-controlled SCIO output to suppress ground bounce, Schmitt-trigger input for noise immunity, and auto-erase-before-write with self-timed 5–10 ms write cycles. Write enable latch (WEL) must be set via WREN command before WRITE or WRSR operations, and is automatically cleared after successful write completion.

Key Specifications

Pinout & Package

11AA020T-I/SN is packaged in 3-lead SOT-23 (SN suffix), with pin 1 = SCIO (Serial Clock/Data I/O), pin 2 = VSS (Ground), pin 3 = VCC (Supply Voltage). No NC pins - full functional utilization of all three terminals.

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/SN, the 11AA020T-I/SN offers lowest pin count (3-pin), smallest footprint (SOT-23-3), and lowest standby current (1 µA), making it optimal for ultra-compact, ultra-low-power designs where UNI/O timing constraints are acceptable.

Availability

11AA020T-I/SN is available at Aetrix Electronics and suitable for smart sensor calibration, IoT device identity storage, and industrial control configuration requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.

Supply support for 11AA020T-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 leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 11AA020T-I/SN belongs to Microchip's UNI/O® Serial EEPROM family, designed specifically for cost-sensitive, space-constrained embedded systems needing minimal GPIO usage, ultra-low power consumption, and robust noise immunity in industrial environments.

FAQ

What is the UNI/O® interface used by the 11AA020T-I/SN?

The 11AA020T-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. Unlike I²C or SPI, it requires only one GPIO, no external clock, and provides built-in noise suppression via Schmitt-trigger inputs and slope-controlled outputs. The 11AA020T-I/SN implements this protocol with strict timing compliance to ±0.50% frequency drift and ±0.06 UI jitter tolerance.

Does the 11AA020T-I/SN support write protection, and how is it configured?

Yes, the 11AA020T-I/SN supports hardware-based block write protection via two nonvolatile BP0 and BP1 bits in its STATUS register. These bits are programmed using the WRSR command and allow protection of 0%, 25%, 50%, or 100% of the 256-byte memory array. Protection is enforced at the hardware level - attempts to write to protected blocks are ignored, and no error flag is generated. This feature is fully implemented in the 11AA020T-I/SN and requires no external components.

What is the maximum write speed and page size of the 11AA020T-I/SN?

The 11AA020T-I/SN supports a maximum bit rate of 100 kbps (equivalent to 100 kHz), with typical page write times of 5–10 ms depending on VCC and temperature. Its page buffer holds up to 16 bytes, enabling efficient burst writes within a single physical page (addresses 0x00–0x0F, 0x10–0x1F, etc.). Writing across page boundaries causes wraparound - a behavior explicitly documented for the 11AA020T-I/SN and must be handled in firmware.

Can the 11AA020T-I/SN operate at 1.8V, and what are its current consumption specs?

Yes, the 11AA020T-I/SN is fully specified for 1.8V operation across the industrial temperature range (–40°C to +85°C). At 1.8V, its active read current is ≤1 mA (typical), and standby current is ≤1 µA (max at +85°C). These values are measured and guaranteed per DS22067J-page 3 DC CHARACTERISTICS table, confirming suitability for battery-powered and energy-harvesting applications where low-voltage operation is mandatory.

What package type does the 11AA020T-I/SN use, and are there pin-compatible alternatives?

The 11AA020T-I/SN uses the 3-lead SOT-23 package (indicated by the "SN" suffix), with pin 1 = SCIO, pin 2 = VSS, pin 3 = VCC. There are no pin-compatible alternatives in the same family - other variants like 11AA020-I/P (PDIP-8) or 11AA020-I/MS (MSOP-8) use different footprints and pin counts. The SOT-23 variant is unique to the "T" and "SN" suffixes and is not interchangeable with 8-lead packages without PCB redesign.