Microchip Technology 24FC01T-E/ST

Overview

24FC01T-E/ST 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, and extended temperature operation from –40°C to +125°C. It supports 8-byte page writes, operates down to 1.7V, and delivers ≤1 µA standby current - ideal for low-power industrial sensor nodes and automotive body control modules requiring nonvolatile configuration storage.

For engineers reviewing the 24FC01T-E/ST datasheet, 24FC01T-E/ST pinout, 24FC01T-E/ST application, or 24FC01T-E/ST equivalent, key selection criteria include its 1 MHz I²C speed at 1.7–5.5V, E-temp qualification, SOIC-8 package compatibility, and hardware WP pin behavior under extended thermal stress.

Technical Context

The 24FC01T-E/ST implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes, while the 8-byte page buffer supports burst writes without host intervention between bytes.

Write protection is implemented via a dedicated WP pin: tied to VSS for full read/write access, or to VCC to inhibit all write operations across the entire 00h–7Fh address space. The device uses self-timed erase/write cycles with no external timing components required.

Key Specifications

Pinout & Package

24FC01T-E/ST is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with 150 mil body width and standard 1.27 mm pitch. Pin 1 is marked by a beveled corner or notch on the package top edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01T-I/ST and AT24C01D-SSHM-T, the 24FC01T-E/ST uniquely combines 1 MHz I²C speed, AEC-Q100 qualification, and –40°C to +125°C operation - making it the only drop-in option for automotive and high-reliability industrial designs demanding both performance and thermal robustness.

Availability

24FC01T-E/ST is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor calibration storage, medical infusion pump settings, and smart energy meter firmware ID applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24FC01T-E/ST 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 automotive, industrial, consumer, and communications markets with vertically integrated silicon and software platforms.

The 24FC01T-E/ST belongs to Microchip's 24XX01 family of serial EEPROMs, designed specifically for low-voltage, low-power, and high-reliability nonvolatile storage in space-constrained embedded systems with stringent environmental requirements.

FAQ

What is the maximum I²C clock frequency supported by the 24FC01T-E/ST?

The 24FC01T-E/ST supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range, verified per DS20001711M AC Characteristics Table 1-2. This exceeds the 400 kHz limit of 24AA01/24LC01B variants and enables faster configuration reads in time-sensitive boot sequences. Operation at 1 MHz requires appropriate SDA/SCL pull-up strength (typically 2 kΩ) and controlled bus capacitance.

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

Yes, the 24FC01T-E/ST requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. For reliable 1 MHz operation, a 2 kΩ pull-up to VCC is recommended; for 400 kHz, 4.7 kΩ is typical. Values must be selected based on bus capacitance and VCC level to meet rise-time specifications in DS20001711M Table 1-2.

How does the WP pin function on the 24FC01T-E/ST?

The WP (Write-Protect) pin on the 24FC01T-E/ST is an active-high hardware lock: when tied to VCC, all write operations to the 00h–7Fh memory array are inhibited while read operations remain fully functional. When tied to VSS or left floating, full read/write access is enabled. This behavior is electrically enforced and independent of I²C commands or power sequencing.

Is the 24FC01T-E/ST AEC-Q100 qualified?

Yes, the 24FC01T-E/ST is explicitly AEC-Q100 qualified for automotive applications, as confirmed in the "Features" section of DS20001711M. Its Extended temperature grade (–40°C to +125°C), 1.7V–5.5V operation, and >4 kV ESD protection align with Grade 1 and Grade 0 stress test requirements for passenger compartment and under-hood use cases.

What is the page write capability of the 24FC01T-E/ST?

The 24FC01T-E/ST features an 8-byte page write buffer, allowing up to eight consecutive bytes to be loaded into the on-chip latch before initiating the internal self-timed write cycle. Page writes must stay within a single 8-byte boundary (e.g., addresses 00h–07h); crossing boundaries causes wraparound. Maximum write cycle time is 5 ms, per DS20001711M Table 1-2 Parameter TWC.