Microchip Technology 24LC256T-I/MNY

Overview

24LC256T-I/MNY from Microchip Technology is a 256-Kbit I²C serial EEPROM in an 8-lead MSOP package, operating from 2.5V to 5.5V with 400 kHz max clock frequency and industrial temperature range (–40°C to +85°C). It features 64-byte page write buffer, hardware write-protection via WP pin, and Schmitt-trigger inputs for noise immunity - used for nonvolatile parameter storage in embedded control systems.

For engineers reviewing the 24LC256T-I/MNY datasheet, 24LC256T-I/MNY pinout, 24LC256T-I/MNY application, or 24LC256T-I/MNY equivalent, key selection criteria include VCC min/max, I²C speed compatibility, page write timing, endurance (1M cycles), and MSOP package footprint with A0/A1 unconnected.

Technical Context

The 24LC256T-I/MNY implements a two-wire I²C interface compliant with standard and fast-mode protocols up to 400 kHz. Its internal architecture includes a 32K × 8-bit EEPROM array, 64-byte page latches, and address decoding logic supporting up to eight devices on one bus via A2/A1/A0 inputs - though A0 and A1 are not connected in the MSOP package, limiting cascading to two devices.

It uses CMOS technology with 3 mA max write current and 1 µA max standby current at I-temp. The device supports byte and page writes with self-timed erase/write cycles (≤5 ms), acknowledges only after completion of internal programming, and incorporates slope-controlled outputs and Schmitt-trigger inputs to suppress ground bounce and noise spikes.

Key Specifications

Pinout & Package

24LC256T-I/MNY is housed in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm pitch, body size 3.0 × 3.0 mm, and exposed pad optional for thermal enhancement. Pin 1 is marked by beveled corner; A0 and A1 pins are not connected per datasheet Note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC256T-I/MNY, the 24AA256T-I/MNY offers broader supply flexibility at identical cost and footprint, while the AT24C256-MSH-T trades proven Microchip compatibility for higher speed and lower VCC - requiring full I²C timing revalidation.

Availability

24LC256T-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended production lifecycles.

Supply support for 24LC256T-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 leading provider of microcontrollers, analog, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and development tools.

The 24LC256 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in space- and cost-constrained embedded systems.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LC256T-I/MNY?

The 24LC256T-I/MNY requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Below 2.5V, functionality is not specified - unlike the 24AA256 variant which supports down to 1.7V. This makes the 24LC256T-I/MNY suitable for stable 3.3V or 5V systems but not for ultra-low-voltage battery operation.

Does the 24LC256T-I/MNY support multi-device addressing on the same I²C bus?

Yes, the 24LC256T-I/MNY supports multi-device addressing using the A2 pin (A0 and A1 are not connected in the MSOP package). With A2 tied to VSS or VCC, up to two devices can share one I²C bus - enabling dual-parameter storage or redundancy without bus contention. Full 8-device cascading requires packages with all three address pins.

How does hardware write-protection work on the 24LC256T-I/MNY?

The WP pin on the 24LC256T-I/MNY provides hardware-level write protection: when pulled high to VCC, all write operations (byte and page) are inhibited while read access remains fully functional. The pin is sampled at the Stop bit of each write command, so toggling WP mid-cycle has no effect - ensuring robust protection against transient faults or software errors.

What is the maximum page write time for the 24LC256T-I/MNY, and how is completion detected?

The 24LC256T-I/MNY has a maximum page write time of 5 ms. Completion is detected via acknowledge polling: after issuing a Stop condition, the host repeatedly sends a Start + control byte (R/W = 0); the device responds with an ACK only once the internal write cycle finishes. This method avoids fixed delays and maximizes bus efficiency in time-sensitive applications.

Is the 24LC256T-I/MNY qualified for automotive applications?

The 24LC256T-I/MNY is rated for industrial temperature (–40°C to +85°C) and is not AEC-Q100 qualified. While it shares the same die as AEC-Q100-qualified variants like the 24LC256-E/MNY, the "I" suffix denotes industrial grade only. For automotive use, the E-grade or explicitly AEC-Q100-certified version must be selected and validated per vehicle OEM requirements.