Microchip Technology 24C01CT-E/MNY

Overview

24C01CT-E/MNY from Microchip Technology is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM operating from 4.5V to 5.5V, featuring 16-byte page write buffer, 1 ms max. write cycle time, and automotive-grade temperature range (−40°C to +125°C). It supports cascading up to eight devices on one bus and delivers ultra-low standby current (5 µA max.) for power-sensitive embedded systems such as automotive body control modules.

For engineers reviewing the 24C01CT-E/MNY datasheet, 24C01CT-E/MNY pinout, 24C01CT-E/MNY application, or 24C01CT-E/MNY equivalent, this device serves as a drop-in replacement for legacy 24C01 variants in automotive infotainment, engine management, and ADAS sensor calibration storage where extended temperature operation and I²C bus noise immunity are critical.

Technical Context

The 24C01CT-E/MNY implements a true two-wire I²C interface with Schmitt-trigger inputs and input filter spike suppression (50 ns), enabling robust operation on electrically noisy automotive buses. Its internal address counter supports sequential reads across the full 128-byte memory space with automatic rollover from address 7Fh to 00h.

Write operations use self-timed erase/write cycles with acknowledge polling support-no external timing control required. Page writes are constrained to 16-byte boundaries; crossing a boundary causes wraparound within the same physical page, requiring firmware-level boundary checks before initiating multi-byte writes.

Key Specifications

Pinout & Package

24C01CT-E/MNY is packaged in an 8-lead DFN (2 mm × 3 mm, 0.5 mm pitch) with exposed pad, optimized for thermal performance and board space efficiency in compact automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-SSHM-T and BR24G01FJ-WE2, the 24C01CT-E/MNY uniquely combines automotive temperature qualification, DFN package with thermal pad, and dedicated Test pin for production testability-making it optimal for space-constrained, thermally demanding automotive modules.

Availability

24C01CT-E/MNY is available at Aetrix Electronics and suitable for automotive body control units, engine management systems, ADAS calibration storage, and infotainment personalization requiring stable component supply across extended product lifecycles.

Supply support for 24C01CT-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, FPGA, and memory solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.

The 24C01CT-E/MNY belongs to Microchip's legacy 24Cxx serial EEPROM family, designed specifically for cost-sensitive, low-power, I²C-based nonvolatile storage in automotive and industrial control applications.

FAQ

What is the maximum I²C clock frequency supported by the 24C01CT-E/MNY?

The 24C01CT-E/MNY supports both standard-mode (100 kHz) and fast-mode (400 kHz) I²C operation. Its AC characteristics guarantee correct timing margins at 400 kHz across the full automotive temperature range (−40°C to +125°C), including minimum clock high/low times and rise/fall time limits. No external speed-select configuration is needed-the device auto-adapts to the master's clock rate.

Does the 24C01CT-E/MNY require external pull-up resistors on SDA and SCL lines?

Yes, the 24C01CT-E/MNY requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Recommended values are 2 kΩ for 400 kHz operation and 10 kΩ for 100 kHz, referenced to VCC. The internal Schmitt-trigger inputs ensure clean signal interpretation even with slower edge rates caused by higher resistance values.

How does page write operation work in the 24C01CT-E/MNY, and what happens if more than 16 bytes are sent?

The 24C01CT-E/MNY features a 16-byte page write buffer. When initiating a page write, the master sends the control byte, word address, and up to 16 data bytes before issuing a STOP condition. If more than 16 bytes are transmitted, the address pointer wraps around within the same 16-byte page, overwriting earlier bytes-no cross-page write occurs. Firmware must enforce page boundaries to avoid unintended data loss.

Is the Test pin on the 24C01CT-E/MNY required to be connected in application circuits?

No, the Test pin on the 24C01CT-E/MNY has no functional role in normal operation and may be left floating, tied high, or tied low without affecting device behavior. It is reserved exclusively for factory wafer sort and final test; no application-level signal conditioning or routing is necessary.

What is the endurance specification for the 24C01CT-E/MNY, and how is it validated?

The 24C01CT-E/MNY is specified for more than 1 million erase/write cycles at 25°C. This value is ensured through characterization-not 100% tested per unit-but reflects statistically validated wear-out behavior across process lots. Endurance remains robust across the full automotive temperature range, with derating models available from Microchip's Total Endurance™ documentation for application-specific lifetime estimation.