Microchip Technology 24C01CT-I/SN

Overview

24C01CT-I/SN 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 and sensor calibration systems.

For engineers reviewing the 24C01CT-I/SN datasheet, 24C01CT-I/SN pinout, 24C01CT-I/SN application, or 24C01CT-I/SN equivalent, key selection criteria include I²C clock compatibility (100/400 kHz), standby current ≤5 µA, endurance >1 million cycles, data retention >200 years, and SOT-23-6 package footprint for space-constrained PCBs.

Technical Context

The 24C01CT-I/SN implements a two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A0, A1, A2), enabling up to four devices on one bus in SOT-23 configuration. Its internal address pointer supports current-address, random, and sequential read modes.

Write operations use an on-chip 16-byte page buffer with automatic address increment within page boundaries; crossing a 16-byte boundary wraps data instead of advancing to next page. Acknowledge polling is supported to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

24C01CT-I/SN is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (2.9 mm × 1.6 mm × 1.1 mm), optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-SSHM-T and BR24G01NUX-5TR, the 24C01CT-I/SN offers strict 4.5–5.5V operation ideal for legacy 5V systems, verified SOT-23-6 mechanical compatibility, and Microchip's long-term supply commitment for industrial OEMs.

Availability

24C01CT-I/SN is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, energy meter firmware ID storage, and medical diagnostic device log retention requiring stable component supply across extended production lifecycles.

Supply support for 24C01CT-I/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 leading provider of microcontrollers, analog, FPGA, and memory solutions, serving industrial, automotive, and consumer markets with vertically integrated design and manufacturing.

The 24C01CT-I/SN belongs to Microchip's legacy 24Cxx serial EEPROM family, engineered for cost-sensitive, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components.

FAQ

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

The 24C01CT-I/SN supports I²C clock frequencies up to 400 kHz under industrial temperature conditions. At 400 kHz, timing parameters such as THIGH (≥600 ns), TLOW (≥1300 ns), and TR/TF (≤300 ns) must be met using appropriate pull-up resistors-typically 2 kΩ for SDA and SCL. The device remains fully functional at 100 kHz for legacy systems or electrically noisy environments.

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

Yes, the 24C01CT-I/SN requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. For 400 kHz operation, a 2 kΩ resistor to VCC is recommended; for 100 kHz, 10 kΩ is typical. Incorrect pull-up values cause timing violations or bus lockup, and the 24C01CT-I/SN will not drive the lines high internally.

How many 24C01CT-I/SN devices can be connected on a single I²C bus?

Up to four 24C01CT-I/SN devices can share one I²C bus. This is because the SOT-23 package omits the A2 pin, leaving only A0 and A1 for chip-select addressing-yielding 2² = 4 unique addresses. Attempting to connect more than four units causes address collisions and communication failure unless external multiplexing is added.

What happens if a page write crosses a 16-byte boundary in the 24C01CT-I/SN?

If a page write command attempts to cross a 16-byte boundary (e.g., writing 17 bytes starting at address 0x0F), the 24C01CT-I/SN wraps the excess data back to the start of the same page (address 0x00), overwriting previously written bytes. This behavior is documented and requires firmware to split writes at page boundaries-a critical constraint when implementing file-system-like storage on the 24C01CT-I/SN.

Is the 24C01CT-I/SN pin-compatible with other Microchip 24C01 variants in SOT-23?

Yes, the 24C01CT-I/SN is pin-compatible with all Microchip 24C01C variants offered in the 6-lead SOT-23 package-including 24C01C-I/SN and 24C01C-E/SN-sharing identical pinout (VCC, SCL, SDA, VSS, A0, A1), mechanical dimensions, and thermal characteristics. Only temperature grade and marking differ; electrical specifications remain consistent across I- and E-grade SOT-23 versions.