Microchip Technology 24FC01T-I/OT

Overview

24FC01T-I/OT from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 1 MHz maximum clock frequency at 1.7–5.5 V, and industrial/extended temperature support (–40°C to +125°C). It features 8-byte page write buffer, Schmitt-trigger inputs, and <1 µA standby current - used for firmware parameter storage in battery-powered IoT sensors and embedded control modules.

For engineers reviewing the 24FC01T-I/OT datasheet, 24FC01T-I/OT pinout, 24FC01T-I/OT application, or 24FC01T-I/OT equivalent, key selection criteria include its 1 MHz I²C speed at low voltage (1.7 V), extended-temp operation up to +125°C, hardware WP pin behavior, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The 24FC01T-I/OT implements a two-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control, supporting byte and page write modes. Its internal architecture includes an 8-byte page latch, HV generator for EEPROM programming, and address pointer auto-increment for sequential reads.

It uses Schmitt-trigger inputs on SDA/SCL with 50 ns spike suppression and slope-controlled outputs to minimize ground bounce. Write protection is implemented via dedicated WP pin tied to VCC (full-array lock) or VSS (enabled), independent of I²C commands.

Key Specifications

Pinout & Package

24FC01T-I/OT is supplied in a 5-lead SOT-23 package (JEDEC MO-178AA), with 1.25 mm pitch, 2.0 mm × 1.25 mm footprint, and exposed pad optional for thermal relief. Pin 1 = SCL, Pin 2 = V_SS, Pin 3 = SDA, Pin 4 = WP, Pin 5 = V_CC. A0–A2 pins are not connected internally and may be left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01T-I/OT, the 24FC01T-I/OT delivers 2.5× higher I²C bandwidth and guaranteed +125°C operation, while AT24C01D-SSHM-T offers comparable speed but sacrifices hardware write protection and compact SOT-23 form factor.

Availability

24FC01T-I/OT is available at Aetrix Electronics and suitable for smart metering, automotive body electronics, industrial PLCs, and medical wearables requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24FC01T-I/OT 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 memory products, with global manufacturing and quality certifications including AEC-Q100 and ISO/TS 16949.

The 24FC01T-I/OT belongs to Microchip's 24XX01 family of serial EEPROMs, designed specifically for robust, low-voltage, high-reliability non-volatile storage in automotive, industrial, and medical applications demanding extended temperature operation and hardware-level data protection.

FAQ

What is the maximum I²C clock frequency supported by the 24FC01T-I/OT?

The 24FC01T-I/OT supports up to 1 MHz I²C clock frequency across its full 1.7 V to 5.5 V V_CC range, unlike the 24AA01T-I/OT (400 kHz max) or 24LC01B (400 kHz, min 2.5 V). This enables faster configuration writes in time-sensitive applications such as factory calibration or firmware updates. The 24FC01T-I/OT maintains timing compliance even at 1.7 V, making it ideal for 1.8 V system interfaces.

Does the 24FC01T-I/OT require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC01T-I/OT requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. For 1 MHz operation, a 2 kΩ pull-up to V_CC is recommended per the datasheet; values scale inversely with bus capacitance and speed. The 24FC01T-I/OT's Schmitt-trigger inputs and slope control ensure clean signal edges even with these external components.

How does the WP pin function on the 24FC01T-I/OT?

The WP (Write-Protect) pin on the 24FC01T-I/OT is a hardware-level enable/disable control: when tied to V_CC, all write operations to the entire 128-byte memory array (00h–7Fh) are inhibited, while reads remain fully functional. When tied to V_SS, normal read/write access is enabled. This behavior is independent of I²C commands and provides fail-safe protection against accidental or malicious writes - a key differentiator from software-only lock mechanisms in alternatives like AT24C01D.

Is the 24FC01T-I/OT pin-compatible with other 24XX01 family members in SOT-23-5 package?

Yes, the 24FC01T-I/OT shares identical pinout (SCL, V_SS, SDA, WP, V_CC) and mechanical footprint with 24AA01T-I/OT and 24LC01BT-I/OT in the SOT-23-5 package. However, electrical differences exist: 24FC01T-I/OT supports 1 MHz I²C and extended temperature (–40°C to +125°C), whereas 24AA01T-I/OT is limited to 400 kHz and industrial grade only. System validation is required before drop-in replacement.

What is the endurance specification for the 24FC01T-I/OT, and how is it tested?

The 24FC01T-I/OT is specified for 1,000,000 erase/write cycles at 25°C and 5.5 V, measured in page mode per Microchip DS20001711M. Endurance is characterized - not 100% tested - but ensured through process qualification and accelerated life testing. Real-world reliability is further enhanced by its >200-year data retention, verified under JEDEC JESD22-A117 stress conditions, making it suitable for infrastructure-grade deployments.