Microchip Technology 11LC040T-E/MNY

Overview

11LC040T-E/MNY from Microchip Technology is a 4 Kbit (512 × 8) serial EEPROM with UNI/O® single-I/O bus interface, operating from 2.5V to 5.5V across -40°C to +125°C (Automotive E-temp), featuring 16-byte page write buffer, 1 µA max standby current, and built-in block write protection for automotive body control modules and sensor calibration storage.

For engineers reviewing the 11LC040T-E/MNY datasheet, 11LC040T-E/MNY pinout, 11LC040T-E/MNY application, or 11LC040T-E/MNY equivalent, key selection factors include its automotive-grade temperature range, UNI/O® bus timing tolerance (±0.5% frequency drift per byte), Schmitt-trigger SCIO input for noise immunity, and verified 1,000,000 erase/write endurance at 125°C.

Technical Context

The 11LC040T-E/MNY implements Manchester-encoded UNI/O® protocol over a single bidirectional SCIO line, extracting clock and data from one signal stream without external clock lines. Its internal re-synchronization circuitry tolerates ±0.06 UI input edge jitter and ±0.5% bus frequency drift per byte, enabling robust operation in electrically noisy automotive environments.

It uses an 8-bit instruction register and STATUS register with WIP and WEL bits for real-time write-state monitoring. Memory access includes random read (0x03), current-address read (0x06), and page-write (0x6C) commands, all requiring master-initiated start headers and MAK/NoMAK handshaking sequences.

Key Specifications

Pinout & Package

11LC040T-E/MNY is packaged in an 8-lead MSOP (MN) package with exposed pad, measuring 3.0 mm × 3.0 mm × 1.0 mm. Pin 1 is SCIO (Serial Clock/Data I/O), Pin 2 is VSS (Ground), Pin 3 is NC (No Connect), Pin 4 is NC, Pin 5 is NC, Pin 6 is NC, Pin 7 is VCC (Supply Voltage), Pin 8 is NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04D-SSHM-T and BR24G04FJ-3GE2, the 11LC040T-E/MNY uniquely delivers automotive-grade thermal performance (-40°C to +125°C), integrated UNI/O® protocol compliance, and hardware block protection - making it the only option qualified for safety-critical, high-temperature automotive memory applications requiring minimal MCU pin usage.

Availability

11LC040T-E/MNY is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, and advanced driver assistance systems requiring stable component supply with full AEC-Q100 traceability and extended temperature support.

Supply support for 11LC040T-E/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, with global manufacturing and quality certifications including ISO/TS 16949 for automotive components.

The 11LCxxx family was designed specifically for automotive and industrial applications demanding single-pin serial communication, ultra-low power consumption, and extended temperature reliability - addressing pin-constrained MCU designs in harsh environments.

FAQ

What is the UNI/O® bus interface used by the 11LC040T-E/MNY?

The 11LC040T-E/MNY uses Microchip's patented UNI/O® bus, a single-wire, half-duplex serial interface that combines clock and data into one Manchester-encoded signal on the SCIO pin. This eliminates the need for separate clock lines and reduces MCU pin count versus I²C or SPI. The 11LC040T-E/MNY fully complies with UNI/O® specification v1.1, supporting up to 100 kbps with built-in re-synchronization to tolerate frequency drift and edge jitter.

Does the 11LC040T-E/MNY support hardware write protection?

Yes, the 11LC040T-E/MNY includes hardware-configurable block write protection controlled by BP0 and BP1 bits in its STATUS register. These nonvolatile bits can protect 0%, 25%, 50%, or 100% of the 512-byte memory array. Protection is enforced at the silicon level and remains active even after power cycling. The 11LC040T-E/MNY also features built-in power-on/off write protection circuitry that disables writes during voltage ramp-up or brownout conditions.

What is the maximum write endurance and data retention for the 11LC040T-E/MNY at 125°C?

The 11LC040T-E/MNY is specified for 1,000,000 erase/write cycles and >200 years of data retention when operated continuously at 125°C. These values are validated per Microchip's characterization methodology and documented in DS22067J. The 11LC040T-E/MNY achieves this through optimized oxide thickness and charge-trapping architecture, making it suitable for automotive applications where long-term calibration data integrity is mandatory.

Can the 11LC040T-E/MNY be used with 1.8V microcontrollers?

No, the 11LC040T-E/MNY operates from 2.5V to 5.5V only. It is not compatible with 1.8V logic levels. For 1.8V systems, Microchip's 11AA040 (same density, 1.8–5.5V range, I-temp only) should be considered instead. The 11LC040T-E/MNY's higher minimum VCC ensures robust noise immunity and reliable UNI/O® timing margins in automotive electrical environments where supply ripple and transients are common.

What package type does the 11LC040T-E/MNY use and what are its key mechanical features?

The 11LC040T-E/MNY is supplied in an 8-lead MSOP (MN) package with exposed thermal pad, measuring 3.0 mm × 3.0 mm × 1.0 mm. It features gull-wing leads for standard SMT reflow, RoHS-compliant matte tin plating, and a moisture sensitivity level (MSL) of 1 per J-STD-020. The exposed pad improves thermal dissipation and must be soldered to a thermal land on the PCB for optimal performance in high-temperature automotive applications.