Microchip Technology 11LC161T-E/MNY

Overview

11LC161T-E/MNY from Microchip Technology is a 16 Kbit (2,048 × 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, STATUS register with WIP/WEL bits, and hardware block write protection for 0%, 25%, 50%, or 100% of memory array.

For engineers reviewing the 11LC161T-E/MNY datasheet, 11LC161T-E/MNY pinout, 11LC161T-E/MNY application, or 11LC161T-E/MNY equivalent, this device serves as a low-pin-count, automotive-grade nonvolatile memory for firmware storage, calibration data retention, and configuration parameter backup in space-constrained embedded systems with strict power and reliability requirements.

Technical Context

The 11LC161T-E/MNY implements Manchester-encoded serial communication over a single SCIO line, extracting clock and data from one bidirectional signal - eliminating need for separate clock lines and reducing PCB routing complexity. Its internal re-synchronization circuitry tolerates ±0.50% frequency drift per byte and ±0.06 UI edge jitter, enabling robust operation under voltage/temperature variation.

It integrates Schmitt-trigger inputs for noise immunity, output slope control to suppress ground bounce, and a current-limited SCIO driver (±4 mA at VCC = 5.5V). The device uses on-chip high-voltage generation for EEPROM programming and includes auto-erase during self-timed write cycles (max 10 ms).

Key Specifications

Pinout & Package

11LC161T-E/MNY is housed in an 8-lead TDFN (Thin Dual Flat No-lead) package, 3 mm × 3 mm × 0.75 mm body, wettable flank terminations, exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation when viewed top-down.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11AA161T-I/MNY, the 11LC161T-E/MNY delivers automotive temperature qualification and tighter VCC min (2.5V vs. 1.8V), making it irreplaceable in engine bay applications; versus 25LC160D-I/SN, it trades SPI speed and pin-level WP for UNI/O®'s single-pin simplicity and integrated block protection - critical for space- and GPIO-constrained automotive nodes.

Availability

11LC161T-E/MNY is available at Aetrix Electronics and suitable for automotive control modules, ADAS subsystems, and industrial programmable logic controllers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant nonvolatile memory.

Supply support for 11LC161T-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 leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 11LCxxx family was designed specifically for automotive and industrial applications demanding ultra-low pin count, high reliability, and extended temperature operation - delivering UNI/O®-based EEPROMs optimized for harsh environments and resource-constrained microcontrollers.

FAQ

What is the device address of the 11LC161T-E/MNY and how does it differ from other 11XX parts?

The 11LC161T-E/MNY uses a fixed 8-bit device address of 0xA1 (10100001b), where the upper 4 bits (1010) are the UNI/O® family code and the lower 4 bits (0001) identify it as a "161" variant. This distinguishes it from 11LC160T-E/MNY (0xA0) and enables coexistence on the same bus - critical for systems integrating multiple 11XX devices without address conflict. The address is hardwired and not software-configurable.

Does the 11LC161T-E/MNY support page writes, and what happens if a write crosses a 16-byte boundary?

Yes, the 11LC161T-E/MNY supports page writes of up to 16 bytes using its internal page buffer. However, if a write command attempts to cross a 16-byte physical page boundary (e.g., writing from address 0x0F to 0x10), data wraps around to the start of the same page (0x00), overwriting previously loaded bytes. Firmware must enforce page-aligned writes or split multi-page operations - the 11LC161T-E/MNY does not auto-segment across boundaries.

How is write protection implemented on the 11LC161T-E/MNY, and can it be changed dynamically?

Write protection on the 11LC161T-E/MNY is controlled by BP0 and BP1 bits in the nonvolatile STATUS register, set via the WRSR instruction. These bits configure lock granularity: 00 = no protection, 01 = top 1/4, 10 = top 1/2, 11 = full array. Once written, protection persists through power cycles and requires WREN + WRSR to modify - preventing accidental changes during normal operation.

What is the maximum allowed SCIO bus frequency for the 11LC161T-E/MNY, and how is timing tolerance enforced?

The 11LC161T-E/MNY supports a maximum serial bus frequency of 100 kHz (100 kbps bit rate), with minimum period of 10 µs. Timing tolerance is enforced via built-in re-synchronization: it accepts ±0.50% frequency drift per byte and ±0.06 unit interval (UI) edge jitter. The device continuously adjusts its internal clock reference on each MAK bit edge to maintain alignment with the master - essential for stable operation across voltage/temperature variation.

Is the 11LC161T-E/MNY pin-compatible with other packages in the 11XX family, such as SOIC or PDIP?

No, the 11LC161T-E/MNY in TDFN package (MNY suffix) is not pin-compatible with SOIC (SN), PDIP (P), MSOP (MS), or SOT-23 (TT) variants. While all 11XX devices share identical SCIO/VCC/VSS signal functions, the TDFN-8 has three NC pins (1,2,3) and two additional NC pins (6,7), whereas SOIC-8 routes those as NC or unused - physical layout, pad geometry, and thermal pad presence differ. Board redesign is required for package substitution.