Microchip Technology 24C01CT-I/MS

Overview

24C01CT-I/MS from Microchip Technology Inc. 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 industrial temperature range (–40°C to +85°C). It uses Schmitt-trigger inputs and slope-controlled outputs for noise immunity on shared buses in embedded control modules.

For engineers reviewing the 24C01CT-I/MS datasheet, 24C01CT-I/MS pinout, 24C01CT-I/MS application, or 24C01CT-I/MS equivalent, key selection criteria include I²C clock compatibility (100 kHz / 400 kHz), standby current (≤5 µA), page write capability, A0–A1 address pin configuration in MSOP package, and industrial-grade reliability for long-term data logging.

Technical Context

The 24C01CT-I/MS implements a two-wire I²C slave interface with fixed 4-bit control code (1010b) and three programmable chip-select bits (A2–A0), enabling up to eight devices on one bus. Its internal address pointer auto-increments during sequential reads and wraps at 0x7F.

It supports byte and page write modes with self-timed erase/write cycles, acknowledge polling for write completion detection, and built-in VCC threshold detection (<3.8 V) to inhibit writes during undervoltage conditions. The SOT-23 variant omits A2, but the MSOP variant retains all three address pins.

Key Specifications

Pinout & Package

The 24C01CT-I/MS is housed in an 8-pin MSOP (Micro Small Outline Package) with 0.65 mm pitch, measuring 3.0 mm × 3.0 mm × 1.0 mm, suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-SSHM-T and STK24C01M-TP, the 24C01CT-I/MS offers strict 4.5–5.5 V operation ideal for legacy 5V systems, full A0–A2 address pin support in MSOP, and proven industrial qualification - making it optimal for cost-sensitive, voltage-stable embedded control applications.

Availability

24C01CT-I/MS is available at Aetrix Electronics and suitable for smart sensor calibration, embedded system configuration, firmware bootloader storage, and industrial equipment identity tagging requiring stable component supply across multi-year production cycles.

Supply support for 24C01CT-I/MS 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24C01CT-I/MS belongs to Microchip's legacy 24Cxx I²C EEPROM family, designed specifically for reliable, low-power, pin-efficient nonvolatile storage in industrial, automotive, and consumer control systems.

FAQ

What is the maximum I²C clock frequency supported by the 24C01CT-I/MS?

The 24C01CT-I/MS supports I²C clock frequencies up to 400 kHz under industrial temperature conditions (–40°C to +85°C). It is also backward-compatible with standard-mode 100 kHz operation. Timing parameters such as THIGH (≥600 ns), TLOW (≥1300 ns), and TR/TF (≤300 ns) are guaranteed across the full voltage and temperature range, ensuring interoperability with common microcontroller I²C peripherals. The 24C01CT-I/MS does not support Fast-mode Plus (1 MHz) timing.

Does the 24C01CT-I/MS have hardware write protection?

The 24C01CT-I/MS does not include a dedicated write-protect (WP) pin or internal hardware write lock. Write enable is controlled solely by the I²C protocol: the device accepts write commands only when addressed with R/W = 0 and valid ACK responses are exchanged. Protection against unintended writes must be implemented at the system level - for example, by disabling I²C access in firmware or using external logic. This differs from variants like STK24C01M-TP that integrate a dedicated WP pin.

How many 24C01CT-I/MS devices can be connected on the same I²C bus?

Up to eight 24C01CT-I/MS devices can be connected on a single I²C bus using unique combinations of the A0, A1, and A2 address pins. Each pin must be hard-wired to either VCC or VSS to set its logic level, producing a 3-bit chip address that forms the most significant bits of the 7-bit slave address (1010xxx). All eight addresses (1010000b to 1010111b) are valid and non-overlapping, enabling seamless expansion to 8 Kbits of contiguous EEPROM space when software manages address mapping across devices.

What is the purpose of the Test pin on the 24C01CT-I/MS?

The Test pin on the 24C01CT-I/MS is reserved exclusively for factory wafer sort and final test operations. It has no defined function in normal application circuitry and must not be connected to active logic. The datasheet explicitly states it may be tied high, tied low, or left floating without affecting device behavior. Unlike dedicated test interfaces (e.g., JTAG), this pin provides no debug, programming, or diagnostic capability for end users - its presence reflects internal manufacturing test architecture only.

Can the 24C01CT-I/MS perform sequential reads across multiple devices on the same bus?

No, the 24C01CT-I/MS does not support sequential reads across device boundaries. While software can map contiguous logical addresses across up to eight devices using A0–A2 as address bits A8–A10, the internal address pointer rolls over only within each individual device's 128-byte memory space (0x00–0x7F). A sequential read initiated on one 24C01CT-I/MS will wrap from 0x7F back to 0x00 and never cross to the next device on the bus. Inter-device address continuity requires explicit master-controlled addressing with separate Start/Stop sequences per device.