Microchip Technology 24FC01T-E/OT

Overview

24FC01T-E/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 max clock frequency (1.7V–5.5V), and extended temperature operation (–40°C to +125°C) in SOT-23-5 package. It supports 8-byte page writes, 5 ms max write cycle time, and >1 million erase/write cycles - used for configuration storage in automotive body controllers and industrial sensor nodes.

For engineers reviewing the 24FC01T-E/OT datasheet, 24FC01T-E/OT pinout, 24FC01T-E/OT application, or 24FC01T-E/OT equivalent, key selection criteria include its 1 MHz I²C speed at 1.7V supply, E-temp qualification, SOT-23-5 footprint compatibility, and WP-controlled full-array write protection - critical for fail-safe parameter retention in harsh environments.

Technical Context

The 24FC01T-E/OT implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes an 8-byte page latch, HV generator for EEPROM programming, and address pointer logic supporting current-address, random, and sequential read modes.

It operates across 1.7V–5.5V with standby current ≤3 µA (E-temp), active read current ≤1 mA, and features acknowledge polling to detect write completion. The device uses fixed 7-bit client address '1010xxx' with R/W bit, where A0–A2 pins are unconnected and may be left floating or tied to VSS/VCC.

Key Specifications

Pinout & Package

24FC01T-E/OT is housed in a 5-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and exposed pad option (not electrically connected). Pin 1 is marked by a dot or bevelled edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24FC01T-E/OT, the 24AA01T-I/OT trades speed and temperature range for lower unit cost in non-automotive applications, while the AT24C01D-SSHM-T offers matching speed and temp range but sacrifices automotive qualification and requires board redesign - making 24FC01T-E/OT the sole drop-in solution for AEC-Q100-compliant, space-constrained, high-speed EEPROM needs.

Availability

24FC01T-E/OT is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor nodes, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24FC01T-E/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 manufacturer specializing in microcontrollers, analog devices, and memory products, with global design and manufacturing infrastructure.

The 24FC01T-E/OT belongs to Microchip's 24XX01 family of serial EEPROMs, designed specifically for reliable, low-voltage, high-speed nonvolatile storage in automotive, industrial, and medical systems demanding AEC-Q100 compliance and extended temperature operation.

FAQ

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

The 24FC01T-E/OT supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range, unlike the 24AA01 (max 400 kHz) or 24LC01B (max 400 kHz below 2.5V). This enables faster configuration writes in time-sensitive applications such as automotive boot-time parameter loading. The 24FC01T-E/OT maintains timing compliance down to 1.7V, eliminating the need for voltage translation in 1.8V systems.

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

Yes, the 24FC01T-E/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 Vcc is recommended per Microchip's AC characteristics table. Incorrect pull-up values cause timing violations - especially THIGH/TLOW margins - leading to communication failures. The 24FC01T-E/OT's Schmitt-trigger inputs tolerate slow rise times but do not eliminate the need for proper termination.

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

The WP (Write-Protect) pin on the 24FC01T-E/OT is a hardwired control: when pulled high to Vcc, it disables all write operations (byte and page) to the entire 128-byte memory array, while read operations remain fully functional. When pulled low to Vss, normal read/write access is enabled. Unlike software locks, this hardware mechanism remains active during power loss or reset, making it essential for safety-critical applications like medical devices or automotive ECUs where accidental writes must be physically prevented.

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

Yes, the 24FC01T-E/OT shares identical pinout (SCL-Vss-SDA-WP-Vcc), package dimensions, and solder land pattern with 24AA01T-I/OT and 24LC01BT-E/OT in the SOT-23-5 variant. However, electrical differences exist: the 24FC01T-E/OT supports 1 MHz I²C at 1.7V, whereas the 24AA01T-I/OT is limited to 400 kHz and the 24LC01BT-E/OT requires ≥2.5V for 400 kHz operation. System-level validation is required before substitution.

What is the endurance and data retention specification for the 24FC01T-E/OT?

The 24FC01T-E/OT guarantees ≥1,000,000 erase/write cycles and >200 years of data retention at 25°C, per Microchip's DS20001711M datasheet. Endurance is tested at 25°C and 5.5V using page-mode writes; retention degrades logarithmically with temperature - e.g., ~100 years at 85°C ambient. These figures apply specifically to the 24FC01T-E/OT and are validated for the SOT-23-5 package under extended temperature conditions.