Microchip Technology 24FC01T-I/SN

Overview

24FC01T-I/SN 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 (down to 1.7V), and industrial temperature range (–40°C to +85°C). It features 8-byte page write buffer, Schmitt-trigger inputs, and <1 µA standby current - used for parameter storage in embedded controllers, sensor calibration data retention, and firmware configuration in low-power IoT edge nodes.

For engineers reviewing the 24FC01T-I/SN datasheet, 24FC01T-I/SN pinout, 24FC01T-I/SN application, or 24FC01T-I/SN equivalent, key selection considerations include its 1.7V–5.5V supply range, 1 MHz I²C timing compliance at full voltage, WP pin-based hardware write-protect, 5 ms max page write time, and SOIC-8 (SN) package compatibility with legacy board layouts.

Technical Context

The 24FC01T-I/SN implements a 2-wire I²C interface with master-controlled bus protocol, supporting standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode plus (1 MHz) operation depending on V_CC. Its internal architecture includes an 8-byte page latch, HV generator for EEPROM programming, and address pointer logic enabling current-address, random, and sequential read modes.

It uses Schmitt-trigger inputs and output slope control to suppress noise and eliminate ground bounce. Write protection is implemented via dedicated WP pin tied to V_CC (full-array lock) or V_SS (enabled), with no internal connection to A0–A2 pins - simplifying PCB routing and eliminating external address jumpers.

Key Specifications

Pinout & Package

24FC01T-I/SN is supplied in 8-lead SOIC (SN) package per Microchip drawing C04-018-P. Pin 1 is marked by notch or bevel; pin count and layout match JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01T-I/SN, the 24FC01T-I/SN delivers 2.5× faster I²C writes and maintains full 1 MHz performance across its entire 1.7–5.5V range, while AT24C01D-SSHM-T offers similar speed but lacks automotive qualification - making 24FC01T-I/SN optimal for time-critical, thermally demanding, or automotive-grade applications.

Availability

24FC01T-I/SN is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, medical handheld diagnostics, and automotive body control units requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for 24FC01T-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24FC01T-I/SN belongs to Microchip's 24XX01 family of serial EEPROMs, designed specifically for reliable, low-power, and pin-compatible nonvolatile storage in resource-constrained embedded systems across industrial, automotive, and medical markets.

FAQ

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

The 24FC01T-I/SN supports up to 1 MHz I²C clock frequency when V_CC is between 1.7V and 5.5V. This is higher than the 400 kHz limit of the 24AA01/24LC01B variants and enables faster configuration writes in time-sensitive applications. The 24FC01T-I/SN maintains this 1 MHz rating across its full operating voltage range - unlike some competitors that derate speed below 2.5V.

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

Yes, the 24FC01T-I/SN requires external pull-up resistors on both SDA and SCL lines because it uses open-drain outputs. For 1 MHz operation, a 2 kΩ resistor is recommended; for lower speeds (e.g., 100 kHz), 10 kΩ is typical. These resistors ensure proper signal rise times and bus arbitration integrity, especially in multi-device I²C configurations.

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

The WP (Write-Protect) pin on the 24FC01T-I/SN provides hardware-level write inhibition: when tied to V_CC, the entire 128-byte memory array (addresses 00h–7Fh) becomes read-only; when tied to V_SS, full read/write access is enabled. This feature is active immediately and requires no command sequence - making it ideal for securing factory-programmed data or preventing runtime corruption.

Is the 24FC01T-I/SN AEC-Q100 qualified?

Yes, the 24FC01T-I/SN is AEC-Q100 qualified for automotive applications. This qualification covers stress testing for temperature cycling, humidity, electrostatic discharge (>4 kV), and reliability under extended thermal conditions (–40°C to +125°C extended range option available). The "I" suffix in 24FC01T-I/SN denotes industrial temperature grade (–40°C to +85°C), which is included in the AEC-Q100 scope for component-level qualification.

What is the purpose of the A0, A1, and A2 pins on the 24FC01T-I/SN?

The A0, A1, and A2 pins on the 24FC01T-I/SN are not internally connected and serve no functional role. They may be left floating or tied to V_SS/V_CC without affecting device operation. This design eliminates address configuration complexity and reduces PCB routing requirements compared to EEPROMs requiring external address bits - simplifying layout and lowering BOM cost.