Microchip Technology 24C01CT/SN

Overview

24C01CT/SN from Microchip Technology Inc. is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM designed for nonvolatile data storage in embedded control and configuration applications. It operates from 4.5V to 5.5V, supports 100 kHz and 400 kHz clock rates, features 16-byte page write buffering, and delivers ≤5 µA standby current and >1 million erase/write cycles. It is commonly used in industrial sensor calibration, power supply configuration, and legacy microcontroller-based system parameter retention.

For engineers reviewing the 24C01CT/SN datasheet, 24C01CT/SN pinout, 24C01CT/SN application, or 24C01CT/SN equivalent, key selection considerations include its SOT-23-6 package footprint, A0/A1 address pin support (no A2), industrial temperature range (–40°C to +85°C), and compatibility with standard I²C master timing requirements including Schmitt-triggered SDA/SCL inputs and noise-suppressed bus operation.

Technical Context

The 24C01CT/SN implements a two-wire I²C slave interface with fixed 7-bit device address prefix '1010' and programmable chip select bits A0 and A1 (A2 omitted in SOT-23). Its internal architecture includes a 16-byte page buffer, self-timed write cycle (≤1.5 ms), and voltage threshold detector disabling write logic below 3.8 V.

It uses Schmitt-trigger inputs on SDA and SCL with ≥50 ns spike suppression and hysteresis ≥0.05×VCC, enabling robust operation on noisy buses. The device supports byte and page writes, current/random/sequential reads, and ACK polling for write completion detection - all compliant with standard I²C protocol timing constraints at both 100 kHz and 400 kHz.

Key Specifications

Pinout & Package

24C01CT/SN is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm body height), optimized for space-constrained PCB layouts. Pin 1 is marked by laser dot; pin 1 = VCC, pin 2 = SCL, pin 3 = SDA, pin 4 = A1, pin 5 = A0, pin 6 = VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-SSHM-T and ST24C01-WDT6-TR, the 24C01CT/SN offers optimal balance of industrial-grade reliability, proven 5V-system compatibility, and availability of factory programming - making it ideal for cost-sensitive, volume-manufactured 5V embedded systems requiring long-term data integrity.

Availability

24C01CT/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, legacy microcontroller configuration, and power supply parameter storage requiring stable component supply across multi-year production cycles.

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

The 24C01CT/SN belongs to Microchip's legacy 24Cxx serial EEPROM family, engineered for robust, low-cost nonvolatile data storage in industrial, consumer, and computing applications where I²C interface simplicity and long-term reliability are essential.

FAQ

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

The 24C01CT/SN supports I²C clock frequencies up to 400 kHz under industrial temperature conditions (–40°C to +85°C). At this rate, timing parameters such as THIGH (≥600 ns), TLOW (≥1300 ns), and TSU:DAT (≥100 ns) must be met. For reliable operation above 100 kHz, ensure proper pull-up resistor sizing (e.g., 2 kΩ for 400 kHz) and bus capacitance ≤400 pF. The 24C01CT/SN does not support Fast-mode Plus (1 MHz) or higher speeds.

Does the 24C01CT/SN support write protection?

The 24C01CT/SN does not include a dedicated hardware write-protect (WP) pin - unlike 8-pin variants such as 24C01C-SN. Its SOT-23-6 package omits the WP terminal, so write protection must be implemented in software via address locking or by controlling access through the I²C master. This design simplifies the package but requires host-level safeguards against accidental writes.

How many 24C01CT/SN devices can be connected on the same I²C bus?

Up to four 24C01CT/SN devices can share a single I²C bus, using combinations of A0 and A1 pins (A2 is not present in the SOT-23 package). Each device responds to a unique 7-bit slave address formed by the base '1010' prefix plus the two configurable bits. Valid addresses are 0x50, 0x51, 0x52, and 0x53 - enabling compact multi-device configurations without address conflicts.

What is the page write capability of the 24C01CT/SN?

The 24C01CT/SN features a 16-byte page write buffer, allowing up to 16 contiguous bytes to be written in a single I²C transaction. Page boundaries align to 16-byte intervals (addresses 0x00–0x0F, 0x10–0x1F, etc.). Attempting to cross a boundary wraps data to the start of the same page - so software must enforce alignment or split writes across boundaries to avoid unintended overwrites.

Is the 24C01CT/SN RoHS compliant and lead-free?

Yes, the 24C01CT/SN is Pb-free and RoHS compliant per EU Directive 2011/65/EU. It uses matte tin (Sn) plating on its SOT-23 terminals and conforms to JEDEC J-STD-609A Class 3 marking standards. The 'T' in the part number denotes Pb-free packaging, and the 'SN' suffix confirms the SOT-23-6 package variant - both consistent with Microchip's official RoHS conversion documentation.