Microchip Technology 24FC04HT-I/OT

Overview

24FC04HT-I/OT from Microchip Technology Inc. is a 4-Kbit I²C-compatible serial EEPROM organized as two 256 × 8-bit blocks, operating from 1.7V to 5.5V with 1 MHz clock support, 16-byte page write buffer, and hardware half-array write-protection (100h–1FFh). It targets embedded system configuration storage, sensor calibration data retention, and industrial controller parameter backup.

For engineers reviewing the 24FC04HT-I/OT datasheet, 24FC04HT-I/OT pinout, 24FC04HT-I/OT application, or 24FC04HT-I/OT equivalent, key selection considerations include its 1 MHz I²C speed at 1.7V–5.5V, industrial/extended temperature range (–40°C to +125°C), 5 ms max page write time, 1 µA standby current, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The 24FC04HT-I/OT implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address counter supports current-address, random, and sequential read modes, while ACK polling enables precise write-cycle completion detection without fixed delays.

It uses a self-timed erase/write architecture with a 16-byte page buffer and hardware write-protect logic tied to the WP pin - when pulled high, it disables writes to addresses 100h–1FFh while allowing full read access across the 000h–1FFh address space.

Key Specifications

Pinout & Package

24FC04HT-I/OT is supplied in a 5-lead SOT-23 package (JEDEC MO-178AA), with compact 2.9 mm × 1.6 mm footprint and 0.95 mm height - optimized for high-density PCBs in portable and space-limited applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA04HT-I/OT and AT24C04D-SSHM-T, the 24FC04HT-I/OT uniquely delivers 1 MHz I²C performance across the full 1.7V–5.5V range and AEC-Q100 qualified extended temperature operation - making it the only option among the three for high-speed, high-reliability automotive and harsh-environment applications.

Availability

24FC04HT-I/OT is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive sensor calibration memory, and medical device parameter backup requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24FC04HT-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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 24FC04H family was designed specifically for robust, low-power, high-speed I²C EEPROM applications in automotive, industrial, and medical systems requiring extended temperature operation and AEC-Q100 qualification.

FAQ

What is the maximum I²C clock frequency supported by the 24FC04HT-I/OT?

The 24FC04HT-I/OT supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range - verified per Microchip DS20002119C AC Characteristics Table 1-2, Param No. 1. This distinguishes it from the 24AA04HT-I/OT (max 400 kHz) and enables faster configuration reads/writes in time-sensitive embedded systems. The 24FC04HT-I/OT maintains this speed even at 1.7V, eliminating need for voltage boosting in 1.8V domains.

Does the 24FC04HT-I/OT require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC04HT-I/OT requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Microchip recommends 2 kΩ for 1 MHz operation (DS20002119C, Section 2.2), and the value must be selected based on bus capacitance and desired rise time. Without proper pull-ups, the 24FC04HT-I/OT cannot drive valid logic-high levels, causing communication failure or intermittent ACK errors.

How does hardware write-protection work on the 24FC04HT-I/OT?

Hardware write-protection on the 24FC04HT-I/OT is controlled by the WP pin: when tied to VCC, writes to memory addresses 100h–1FFh (upper 256 bytes) are inhibited while reads remain fully functional; when tied to VSS, full read/write access is enabled across 000h–1FFh. This is implemented internally - no software command or timing sequence is required. The 24FC04HT-I/OT datasheet confirms this behavior in Section 2.4 and Figure 6-3.

Is the 24FC04HT-I/OT AEC-Q100 qualified?

Yes, the 24FC04HT-I/OT is explicitly AEC-Q100 qualified for automotive applications, as stated in the "Features" section of DS20002119C (page 1). It meets Grade 1 (–40°C to +125°C) requirements and is validated for use in engine control, body electronics, and ADAS subsystems. This qualification covers stress testing, reliability, and parametric verification - confirming suitability beyond standard industrial-grade parts like the 24AA04HT-I/OT.

What is the endurance rating of the 24FC04HT-I/OT, and how is it measured?

The 24FC04HT-I/OT has an endurance rating of 1,000,000 erase/write cycles, specified at 25°C and 5.5V using page-mode writes (DS20002119C, Table 1-1, Param No. 18). This value is not extrapolated - it is characterized and guaranteed per JEDEC standards. Each cycle represents a complete page (up to 16 bytes) write operation, and the rating applies uniformly across all memory locations. Real-world wear leveling is unnecessary due to this high cycle count.