Microchip Technology 11LC040T-I/MNY

Overview

11LC040T-I/MNY from Microchip Technology Inc. is a 4 Kbit (512 × 8) serial EEPROM using the UNI/O® single I/O bus interface. It operates from 2.5V to 5.5V, draws ≤1 µA standby current (I-temp), supports 100 kbps Manchester-encoded communication, and features 16-byte page-write buffering with built-in write protection and >200-year data retention.

For engineers reviewing the 11LC040T-I/MNY datasheet, 11LC040T-I/MNY pinout, 11LC040T-I/MNY application, or 11LC040T-I/MNY equivalent, key selection considerations include its 3-lead SOT-23 package, industrial temperature range (–40°C to +85°C), UNI/O® protocol timing constraints (±0.5% frequency drift tolerance per byte), and block write-protection configuration via STATUS register.

Technical Context

The 11LC040T-I/MNY implements a Manchester-encoded, master-controlled UNI/O® bus where clock and data share the SCIO line. Its internal architecture includes a current-limited slope-controlled output driver, Schmitt-trigger input on SCIO, and re-synchronization logic that tracks master bit period drift (FDRIFT ≤ ±0.5%/byte) and edge jitter (TIJIT ≤ ±0.06 UI).

It uses an 8-bit instruction set (e.g., 0x03 READ, 0x6C WRITE, 0x05 RDSR) with MSb-first transmission, a 16-byte page buffer, and a STATUS register with WIP/WEL/BP0/BP1 bits. Write cycles are self-timed (TWC ≤ 10 ms), and the device enters Standby mode after NoMAK+SAK or a TSTBY ≥ 600 µs high pulse on SCIO.

Key Specifications

Pinout & Package

11LC040T-I/MNY is packaged in a 3-lead SOT-23 (MNY suffix), with pin 1 = SCIO, pin 2 = VSS, pin 3 = VCC. 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 11AA040T-I/MNY, the 11LC040T-I/MNY offers higher minimum VCC (2.5V vs. 1.8V) but identical packaging and timing-making it preferable in 3.3V/5V systems where voltage margin is assured. Versus 24LC04B-I/P, it saves one GPIO and simplifies routing but mandates UNI/O®-capable firmware.

Availability

11LC040T-I/MNY is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply and long-term manufacturability.

Supply support for 11LC040T-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 a focus on embedded control and connectivity solutions.

The 11LC040T-I/MNY belongs to Microchip's UNI/O® Serial EEPROM family, designed specifically for cost-sensitive, space-constrained applications needing minimal GPIO count and ultra-low-power nonvolatile storage.

FAQ

What is the UNI/O® interface used by the 11LC040T-I/MNY, and how does it differ from I²C or SPI?

The 11LC040T-I/MNY uses Microchip's patented UNI/O® bus-a single-wire, Manchester-encoded serial interface where clock and data are combined on the SCIO line. Unlike I²C (2-wire, open-drain) or SPI (4-wire, separate clock/data), UNI/O® requires only one GPIO, eliminates clock skew concerns, and embeds synchronization in the start header. This reduces MCU pin count and PCB routing complexity, making it ideal for compact designs where GPIOs are scarce.

Does the 11LC040T-I/MNY support write protection, and how is it configured?

Yes, the 11LC040T-I/MNY supports hardware-based block write protection via two bits (BP0, BP1) in its STATUS register. These bits are programmed using the WRSR command and allow protection of none, 1/4, 1/2, or the entire memory array. Protection is nonvolatile and persists across power cycles. The write enable latch (WEL bit) must also be set via WREN before any unprotected write can occur-adding a second layer of safety against accidental overwrites.

What is the maximum write speed and timing behavior of the 11LC040T-I/MNY during a page write?

The 11LC040T-I/MNY supports up to 16-byte page writes with a maximum internal write cycle time (TWC) of 10 ms for byte or page operations. After the host transmits the final data byte and a NoMAK, the device initiates auto-erase-and-write. During this time, the WIP bit in the STATUS register reads '1', and the SCIO line is released. Hosts must poll RDSR until WIP = 0 before issuing further commands-ensuring deterministic timing for real-time systems.

Can the 11LC040T-I/MNY operate reliably in electrically noisy environments, and what features support this?

Yes, the 11LC040T-I/MNY is engineered for noise resilience: its SCIO input includes a Schmitt trigger with ≥0.05×VCC hysteresis, and the input filter suppresses spikes <50 ns. Output slope control limits dI/dt to prevent ground bounce. Combined with 4 kV HBM ESD rating and Manchester encoding's inherent clock recovery, these features ensure reliable communication in industrial motor drives, automotive modules, and factory automation equipment.

Is the 11LC040T-I/MNY pin-compatible with other devices in the 11XX family, such as the 11LC080T-I/MNY?

No-while the 11LC040T-I/MNY and 11LC080T-I/MNY share identical 3-lead SOT-23 (MNY) packaging and pinout (SCIO/VSS/VCC), they are not functionally interchangeable without firmware changes. The 11LC080T-I/MNY has double the density (8 Kbit, 1024×8) and same UNI/O® protocol, but address space and timing margins differ. Direct substitution may cause read/write errors unless host software accounts for extended memory mapping and potential timing variations.