Microchip Technology 24FC02-E/ST

Overview

24FC02-E/ST from Microchip Technology Inc. is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protection, 1 MHz clock support down to 1.7V, and extended temperature operation from –40°C to +125°C. It features 8-byte page write buffer, Schmitt-trigger inputs, slope-controlled outputs, and >1 million erase/write cycles - deployed in automotive body control modules for storing calibration data and configuration parameters.

For engineers reviewing the 24FC02-E/ST datasheet, 24FC02-E/ST pinout, 24FC02-E/ST application, or 24FC02-E/ST equivalent, key selection considerations include its 1 MHz I²C speed at 1.7V–5.5V supply, E-temp grade qualification, SOIC-8 wettable flanks package, and hardware WP pin behavior under VCC/VSS biasing.

Technical Context

The 24FC02-E/ST implements a two-wire I²C interface with fixed 7-bit client address (1010xxxR/W), no internal A0–A2 decoding, and automatic address pointer incrementation during sequential reads. Its internal architecture includes a high-voltage generator for EEPROM programming, page latches for 8-byte buffering, and dedicated I/O control logic managing SDA open-drain timing and SCL synchronization.

It supports three I²C modes: 100 kHz (VCC < 2.5V), 400 kHz (2.5V ≤ VCC ≤ 5.5V), and full 1 MHz (1.7V ≤ VCC ≤ 5.5V). Write protection is implemented via direct-level-sensitive WP pin logic - tied to VCC disables all writes; tied to VSS enables full read/write access - with no internal register-based locking.

Key Specifications

Pinout & Package

24FC02-E/ST is supplied in an 8-lead SOIC package with wettable flanks (ST suffix), measuring 3.90 mm × 4.90 mm × 1.75 mm. The package supports automated optical inspection (AOI) and improves solder joint reliability in automotive reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24FC02-E/ST, the 24AA02-I/ST trades 1 MHz speed and extended temperature for lower cost, while AT24C02D-SSHM-T offers similar speed but lacks 1.7V operation and automotive qualification - making 24FC02-E/ST uniquely suited for high-reliability, low-voltage, extended-temperature deployments.

Availability

24FC02-E/ST is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24FC02-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO/TS 16949 and AEC-Q200.

The 24FC02 belongs to Microchip's 24XX02 family of serial EEPROMs engineered for robustness in automotive and industrial environments - emphasizing low-voltage operation, high endurance, and AEC-Q100 compliance.

FAQ

What is the maximum I²C clock frequency supported by the 24FC02-E/ST?

The 24FC02-E/ST supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range. This is distinct from the 24AA02 (max 400 kHz) and 24LC02B (max 400 kHz, minimum 2.5V). At VCC < 2.5V, the 24FC02-E/ST automatically complies with 100 kHz timing - ensuring interoperability with legacy I²C masters while enabling high-speed operation where voltage permits. The 24FC02-E/ST datasheet specifies THIGH = 260 ns and TLOW = 500 ns at 1 MHz.

How does the WP pin function on the 24FC02-E/ST?

The WP pin on the 24FC02-E/ST is a level-sensitive hardware write-protect input. When tied to VCC, it disables all write operations (including byte and page writes) to the entire 256-byte memory array, while read operations remain fully functional. When tied to VSS, write capability is fully enabled. Unlike register-based protection, this is purely hardware-enforced with zero firmware overhead - a critical feature for safety-critical automotive applications where unintended writes must be physically prevented.

Is the 24FC02-E/ST AEC-Q100 qualified, and what grade does it meet?

Yes, the 24FC02-E/ST is AEC-Q100 qualified and certified to Grade 1 (–40°C to +125°C ambient). This qualification covers stress tests including accelerated temperature/humidity, high-temperature operating life, temperature cycling, and electrostatic discharge (HBM >4 kV). The "E" in 24FC02-E/ST explicitly denotes Extended temperature grade, and the device is listed in Microchip's official AEC-Q100 qualified parts documentation for automotive use cases.

What package type does the "ST" suffix indicate for the 24FC02-E/ST?

The "ST" suffix in 24FC02-E/ST denotes an 8-lead SOIC package with wettable flanks - a gull-wing lead configuration optimized for automated optical inspection (AOI) and improved solder joint reliability. Its dimensions are 3.90 mm × 4.90 mm × 1.75 mm, with 1.27 mm pitch. This package variant is specifically designed for automotive and industrial applications where solder joint integrity under thermal cycling is critical, and it replaces standard SOIC (e.g., "SN") in high-reliability builds.

Can the A0, A1, and A2 pins on the 24FC02-E/ST be used for device addressing?

No, the A0, A1, and A2 pins on the 24FC02-E/ST are not internally connected and serve no addressing function. The device uses a fixed 7-bit I²C client address (1010xxxR/W) where the three LSBs (xxx) are "don't care" bits - meaning up to eight 24FC02-E/ST devices can share the same I²C bus without address conflicts, regardless of A0–A2 states. These pins may be left floating or tied to VSS/VCC with no impact on operation, simplifying PCB layout and eliminating external jumpers or resistors.