Microchip Technology 24FC04H-E/ST

Overview

24FC04H-E/ST 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 delivers ≤1 µA standby current (E-temp), >1 million erase/write cycles, and >200-year data retention for embedded configuration storage in automotive and industrial control modules.

For engineers reviewing the 24FC04H-E/ST datasheet, 24FC04H-E/ST pinout, 24FC04H-E/ST application, or 24FC04H-E/ST equivalent, this page provides verified electrical specs, SOIC-8 package details, I²C timing compliance at 1 MHz (1.7V–5.5V), WP-controlled memory protection behavior, and validated alternatives for drop-in or functional replacement scenarios.

Technical Context

The 24FC04H-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 supports current-address, random, and sequential read modes, while ACK polling enables precise write-cycle completion detection without fixed delays.

It features a 16-byte page write buffer with self-timed erase/write cycles (≤5 ms), hardware write-protect logic tied to the WP pin, and dual temperature grading (–40°C to +125°C extended range). The device uses no internal connections for A0–A2 pins, simplifying board layout and eliminating external address strapping.

Key Specifications

Pinout & Package

24FC04H-E/ST is supplied in an 8-lead SOIC (SN) package, 3.90 mm body width, with gull-wing leads and JEDEC-standard footprint. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24FC04H-E/ST, the 24AA04H-I/ST trades 1 MHz speed and extended temperature for lower cost, while the AT24C04D-SSHM-T matches speed and temp grade but omits hardware half-array protection - making 24FC04H-E/ST uniquely suited for safety-critical partitioned storage.

Availability

24FC04H-E/ST is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC configuration, and medical device calibration requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-qualified traceability.

Supply support for 24FC04H-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The 24FC04H belongs to Microchip's 24XX04H family of I²C EEPROMs engineered for robust, low-power nonvolatile storage in automotive, industrial, and medical systems demanding extended temperature operation and hardware write protection.

FAQ

What is the maximum I²C clock frequency supported by the 24FC04H-E/ST?

The 24FC04H-E/ST supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range and –40°C to +125°C temperature grade. This is confirmed in Table 1-2 of DS20002119C, distinguishing it from the 24AA04H (400 kHz) and 24LC04BH (400 kHz, 2.5V min). The 24FC04H-E/ST maintains timing compliance even at 1.7V, enabling direct interface with low-voltage MCUs without level shifters.

How does the WP pin function on the 24FC04H-E/ST?

On the 24FC04H-E/ST, the WP pin enables hardware write-protection for the upper half of memory (addresses 100h–1FFh) when tied to VCC; tying it to VSS enables full-array read/write access. This behavior is explicitly defined in Section 2.4 and Figure 6-3 of DS20002119C. Unlike software-based locks, this protection persists through power cycles and cannot be overridden by I²C commands.

Is the 24FC04H-E/ST AEC-Q100 qualified?

Yes, the 24FC04H-E/ST is explicitly listed as "Automotive AEC-Q100 Qualified" in the Features section of DS20002119C. Its extended temperature rating (–40°C to +125°C) and qualification testing meet AEC-Q100 Rev G stress requirements for Grade 1 components, making it suitable for under-hood and safety-related automotive subsystems.

What package type does the 24FC04H-E/ST use, and what are its key mechanical dimensions?

The 24FC04H-E/ST uses the 8-lead SOIC (SN) package, 3.90 mm body width, per Microchip Drawing No. C04-057-SN Rev F. Key dimensions include 1.27 mm pitch, 4.90 mm overall length, 3.90 mm body width, and 1.25–1.75 mm molded thickness. Land pattern recommendations are provided in DS20002119C-page 23 for reliable reflow soldering.

Are the A0, A1, and A2 pins functional on the 24FC04H-E/ST?

No - the A0, A1, and A2 pins on the 24FC04H-E/ST have no internal connection, as stated in Section 2.1 and Table 2-1 of DS20002119C. They may be left floating or tied to VSS/VCC without affecting device operation or addressing. This eliminates external address strapping components and simplifies PCB routing compared to higher-density EEPROMs requiring address pins.