Microchip Technology 24C01CT-I/MC

Overview

24C01CT-I/MC 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 systems.

For engineers reviewing the 24C01CT-I/MC datasheet, 24C01CT-I/MC pinout, 24C01CT-I/MC application, or 24C01CT-I/MC equivalent, key selection criteria include I²C clock compatibility (100/400 kHz), standby current ≤5 µA, page write capability, A0–A1 address pins (no A2 in SOT-23), and TSSOP-8 package with Pb-free RoHS compliance.

Technical Context

The 24C01CT-I/MC implements a two-wire I²C slave interface with fixed 7-bit device address prefix '1010', where A0 and A1 pins define the lower two chip-select bits (A2 is absent in SOT-23 variant). It supports byte and page write modes, with internal address pointer auto-increment and wraparound at 0x7F → 0x00 during sequential reads.

Its internal architecture includes HV generator for EEPROM programming, X/Y decoders, sense amplifier, and VCC threshold detector disabling write logic below 3.8 V. Noise suppression is achieved via Schmitt-trigger inputs (hysteresis ≥0.05×VCC) and input filter spike suppression ≤50 ns on SDA/SCL.

Key Specifications

Pinout & Package

24C01CT-I/MC is packaged in 6-lead SOT-23 (JEDEC MO-178AA), with pin 1 marked by laser, exposed pad not electrically connected. Pinout differs from 8-pin variants: A2 is omitted, Test pin absent, and pin count reduced to minimize board space in compact designs.

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/MC offers lowest-cost industrial-grade SOT-23 solution with proven noise immunity in 5V systems, but lacks hardware write protection and wide-voltage flexibility - making it optimal for cost-sensitive, fixed-rail embedded control where software-managed writes suffice.

Availability

24C01CT-I/MC is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration memory, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for 24C01CT-I/MC 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions for industrial, automotive, and consumer markets.

The 24C01C family was designed as a cost-optimized, drop-in serial EEPROM solution for space-constrained 5V systems requiring reliable, low-power configuration storage - with the 24C01CT-I/MC variant specifically targeting SOT-23 footprint applications.

FAQ

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

The 24C01CT-I/MC supports both standard-mode (100 kHz) and fast-mode (400 kHz) I²C operation, as confirmed in Table 1-2 of DS21201K. Its AC characteristics - including THIGH, TLOW, and rise/fall times - are fully specified for both speeds across the industrial temperature range (–40°C to +85°C). No external speed limiting is required when using compliant pull-up resistors (e.g., 2 kΩ for 400 kHz).

Does the 24C01CT-I/MC have a hardware write-protect (WP) pin?

No, the 24C01CT-I/MC in SOT-23 package does not include a dedicated WP pin. Unlike 8-pin variants (e.g., 24C01C-I/P), the SOT-23 version omits both the Test and WP functions to accommodate the 6-lead form factor. Write protection is implemented exclusively via I²C command protocol - no hardware-level lockout is available.

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

Up to four 24C01CT-I/MC devices can share one I²C bus, as stated in Section 2.3 and Figure 5-1 of DS21201K. This is because the SOT-23 variant lacks the A2 pin, leaving only A0 and A1 to configure chip-select bits - yielding 2² = 4 unique addresses (1010_00, 1010_01, 1010_10, 1010_11). Attempting more than four will cause address collisions.

What is the page size and boundary behavior during write operations for the 24C01CT-I/MC?

The 24C01CT-I/MC has a 16-byte page buffer and enforces strict page boundaries: writes crossing addresses 0x0F→0x10, 0x1F→0x20, etc., wrap around to the start of the same page instead of advancing to the next. As documented in Section 6.2, software must ensure all bytes in a page write fall within a single 16-byte block (e.g., 0x00–0x0F) to avoid unintended overwrites.

Is the 24C01CT-I/MC compatible with 3.3V I²C systems?

No, the 24C01CT-I/MC is specified only for 4.5V to 5.5V operation per Section 1.0 and Table 1-1. Its VIH minimum is 0.7×VCC (≥3.15V at 4.5V), but it lacks guaranteed functionality below 4.5V. Using it with 3.3V I²C masters risks undervoltage reset, failed ACKs, or corrupted writes - a level-shifter or 5V-tolerant alternative (e.g., AT24C01D) is required for true 3.3V compatibility.