Microchip Technology 11AA040T-I/MNY

Overview

11AA040T-I/MNY from Microchip Technology Inc. is a 4 Kbit (512 × 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 industrial control and sensor calibration applications.

For engineers reviewing the 11AA040T-I/MNY datasheet, 11AA040T-I/MNY pinout, 11AA040T-I/MNY application, or 11AA040T-I/MNY equivalent, this device is selected for ultra-low-power embedded systems requiring minimal I/O count, robust noise immunity, and guaranteed 1 million erase/write cycles with >200-year data retention.

Technical Context

The 11AA040T-I/MNY implements Manchester-encoded UNI/O® protocol over a single bidirectional SCIO line, eliminating need for separate clock or chip-select signals. Its internal timing recovery circuitry synchronizes to master bit period during start header and re-synchronizes on each MAK edge, tolerating ±0.5% frequency drift per byte and ±0.06 UI input jitter.

It integrates a status register with WIP and WEL bits, block protection (BP0/BP1) for 0%, 25%, 50%, or 100% array write lock, and hardware power-on/off write protection. Write operations are self-timed with 5–10 ms cycle time and require explicit WREN command prior to WRITE or WRSR.

Key Specifications

Pinout & Package

11AA040T-I/MNY is packaged in an 8-lead MSOP (MS) package with exposed pad, measuring 3.0 mm × 3.0 mm × 1.0 mm. Pin 1 is SCIO, Pin 2 is VSS, Pin 3 is NC, Pin 4 is NC, Pin 5 is NC, Pin 6 is NC, Pin 7 is NC, Pin 8 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04C-SSHM-T and BR24G04FJ-WE2, the 11AA040T-I/MNY uniquely delivers single-pin UNI/O® simplicity with full status visibility and configurable block protection - enabling tighter system-level control in resource-constrained designs where pin count and write safety are critical.

Availability

11AA040T-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, smart energy metering, and portable instrumentation requiring stable component supply across extended product lifecycles.

Supply support for 11AA040T-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, interface, and memory solutions for industrial, automotive, and consumer markets.

The 11AA040T-I/MNY belongs to Microchip's UNI/O® serial EEPROM family, designed specifically for ultra-low-pin-count embedded systems where minimizing I/O usage, power consumption, and board area is essential without sacrificing data integrity or configurability.

FAQ

What is the UNI/O® interface used by the 11AA040T-I/MNY?

The 11AA040T-I/MNY uses Microchip's patented UNI/O® bus - a single-wire, Manchester-encoded serial interface that combines clock and data on the SCIO pin. It requires no separate clock or chip-select lines, reducing MCU GPIO usage and PCB routing complexity. The 11AA040T-I/MNY synchronizes to the master's bit period during the start header and maintains timing via MAK-edge re-synchronization.

Does the 11AA040T-I/MNY support hardware write protection?

Yes, the 11AA040T-I/MNY includes multiple hardware write protection mechanisms: power-on/off data protection circuitry prevents spurious writes during voltage transitions; a write enable latch (WEL) must be set via WREN command before any write; and block protection bits (BP0/BP1) allow locking 0%, 25%, 50%, or 100% of the memory array permanently until cleared via WRSR.

What is the maximum write speed and page size of the 11AA040T-I/MNY?

The 11AA040T-I/MNY supports up to 100 kbps bit rate (equivalent to 100 kHz bus frequency) and features a 16-byte page write buffer. Self-timed write cycles complete in 5 ms (byte or page) or 10 ms (ERAL/SETAL). This enables efficient bulk updates - for example, writing 16 calibration coefficients in one transaction instead of 16 separate writes.

How does the 11AA040T-I/MNY handle noise on the SCIO line?

The 11AA040T-I/MNY incorporates Schmitt trigger inputs on the SCIO pin with ≥50 mV hysteresis (0.05×VCC) and output slope control to suppress ground bounce. Its input filter rejects spikes <50 ns, and Manchester encoding provides inherent noise immunity by encoding both clock and data. These features ensure reliable operation in electrically noisy industrial environments such as motor drives or power supplies.

What packages are available for the 11AA040T-I/MNY?

The 11AA040T-I/MNY is offered in an 8-lead MSOP (MS) package (3.0 mm × 3.0 mm × 1.0 mm) with exposed pad, as indicated by the "MNY" suffix. Other variants in the 11AA040 family include PDIP (P), SOIC (SN), TDFN (MN), SOT-23 (TT), TO-92 (TO), and Chip Scale (CS), but the 11AA040T-I/MNY specifically corresponds to the MSOP variant rated for Industrial temperature range (−40°C to +85°C).