Microchip Technology 11LC040T-E/SN

Overview

11LC040T-E/SN from Microchip Technology Inc. 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, 100 kbps max bit rate, and built-in block write protection for automotive body control modules, sensor calibration storage, and infotainment configuration memory.

For engineers reviewing the 11LC040T-E/SN datasheet, 11LC040T-E/SN pinout, 11LC040T-E/SN application, or 11LC040T-E/SN equivalent, this page delivers verified electrical specs, UNI/O® timing constraints, SCIO pin behavior under jitter/frequency drift, standby pulse requirements, and real-world substitution guidance for automotive-grade serial EEPROM selection.

Technical Context

The 11LC040T-E/SN implements Manchester-encoded UNI/O® protocol on a single bidirectional SCIO line, eliminating need for separate clock and data lines. It uses internal re-synchronization circuitry to tolerate ±0.50% bus frequency drift per byte and ±0.06 UI input edge jitter, with automatic phase adjustment on every MAK bit.

Its architecture includes a nonvolatile STATUS register (WIP/WEL/BP bits), 16-byte page latches, Schmitt-trigger SCIO input for noise immunity, and slope-controlled output to suppress ground bounce. Write cycles are self-timed (max 10 ms), with endurance of 1 million erase/write cycles and >200 years data retention at 125°C.

Key Specifications

Pinout & Package

11LC040T-E/SN is packaged in 8-lead SOIC (SN) with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC footprint. Pin 1 is SCIO, Pin 2 is VSS, Pin 3 is VCC, Pins 4–8 are NC (no connect).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04D-SSHM-T and BR24G04NUX-10, the 11LC040T-E/SN uniquely delivers single-pin UNI/O® operation with automotive-grade jitter/frequency drift resilience, integrated slope control, and configurable block protection - making it optimal for new designs prioritizing GPIO conservation and under-hood reliability.

Availability

11LC040T-E/SN is available at Aetrix Electronics and suitable for automotive body control modules, engine calibration storage, and infotainment configuration memory requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 11LC040T-E/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with broad automotive qualification and AEC-Q100-compliant portfolio.

The 11LC040T-E/SN belongs to Microchip's UNI/O® serial EEPROM family, designed specifically for automotive and industrial applications demanding minimal pin count, high noise immunity, and guaranteed data integrity under extreme thermal and electrical stress.

FAQ

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

The 11LC040T-E/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, eliminates clock skew issues, and incorporates built-in re-synchronization to handle ±0.50% frequency drift per byte and ±0.06 UI edge jitter - critical for reliable operation in electrically noisy automotive environments.

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

Yes, the 11LC040T-E/SN includes configurable hardware block write protection controlled by BP0 and BP1 bits in its STATUS register. These nonvolatile bits allow locking 0%, 25%, 50%, or 100% of the 512-byte memory array. Protection is enforced at the silicon level - even if software attempts a write, the device ignores it when the corresponding block is protected, ensuring calibration data or safety-critical parameters remain intact.

What is the maximum write speed and timing for the 11LC040T-E/SN?

The 11LC040T-E/SN supports up to 100 kbps bit rate (equivalent to 100 kHz), with typical page write time of ≤5 ms and maximum of 10 ms. Its 16-byte page buffer enables burst writes without intermediate command overhead. Write cycles are self-timed and include auto-erase; no external timing control is needed. The STATUS register's WIP bit allows precise polling to avoid premature read attempts.

How does the 11LC040T-E/SN handle power loss during write operations?

The 11LC040T-E/SN incorporates built-in power-loss protection circuitry that monitors VCC. If voltage drops below safe write threshold during a write cycle, the device aborts the operation and retains pre-write data integrity. Combined with its 1,000,000-cycle endurance and >200-year data retention at 125°C, this ensures robustness against brownouts common in automotive 12V systems - no external capacitors or backup power required.

Is the 11LC040T-E/SN pin-compatible with other devices in the 11XX family?

Yes, the 11LC040T-E/SN shares identical 8-lead SOIC (SN) pinout and UNI/O® protocol with all 11LCXXX and 11AAXXX devices in the same package variant, including 11LC010, 11LC020, 11LC080, and 11LC160. This enables drop-in density upgrades on existing PCBs - only firmware address mapping changes are needed, with no layout or schematic modifications required.