Microchip Technology 24FC08-I/ST

Overview

24FC08-I/ST from Microchip Technology Inc. is an 8-Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit blocks, supporting 1 MHz clock frequency at 1.7–5.5 V supply, with hardware write-protection via WP pin and 16-byte page write buffer. It operates across -40°C to +125°C (Extended temperature grade) in 8-lead SOIC package and is used for nonvolatile configuration storage in industrial sensor nodes and power management subsystems.

For engineers reviewing the 24FC08-I/ST datasheet, 24FC08-I/ST pinout, 24FC08-I/ST application, or 24FC08-I/ST equivalent, this page delivers verified electrical specs, SOIC package terminal mapping, I²C timing compliance at 1 MHz, endurance (1M cycles), and real-world use cases - all confirmed against Microchip DS20001710M.

Technical Context

The 24FC08-I/ST 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 a 16-byte page latch, HV generator for EEPROM programming, and address pointer logic enabling current-address, random, and sequential read modes.

It supports full I²C protocol compliance including Start/Stop condition generation, ACK polling during write cycles, and block-select addressing (B1/B0 bits). The device uses self-timed erase/write cycles with no external timing components required, and features hardware write-protection activated by tying WP to VCC.

Key Specifications

Pinout & Package

24FC08-I/ST is supplied in an 8-lead SOIC (SN) package per Microchip drawing C04-057-SN Rev F, with 3.90 mm body width, 1.27 mm pitch, and JEDEC-standard pinout. All A0–A2 pins are internally unconnected and may be left floating or tied to VSS/VCC without functional impact.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA08-I/ST and AT24C08D-SSHM-T, the 24FC08-I/ST uniquely combines 1 MHz speed, 1 million endurance cycles, and 200-year data retention in a drop-in SOIC-8 footprint - making it optimal for industrial and automotive applications demanding both performance and longevity.

Availability

24FC08-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive power module configuration, and medical device settings backup requiring stable component supply, extended temperature operation, and long-term data integrity.

Supply support for 24FC08-I/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 9001 and AEC-Q100.

The 24FC08-I/ST belongs to Microchip's 24XX08 family of I²C EEPROMs, designed specifically for robust, low-power nonvolatile storage in harsh environments where extended temperature range and high endurance are mandatory.

FAQ

What is the maximum I²C clock frequency supported by the 24FC08-I/ST?

The 24FC08-I/ST supports up to 1 MHz I²C clock frequency across its full 1.7 V to 5.5 V supply range, as specified in Microchip DS20001710M Table 1-1 AC Characteristics. This is higher than the 400 kHz limit of the 24AA08-I/ST and enables faster configuration writes in time-sensitive applications. The 24FC08-I/ST maintains full timing compliance including THIGH (260 ns min) and TLOW (500 ns min) at 1 MHz.

Does the 24FC08-I/ST require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC08-I/ST requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Microchip recommends 2 kΩ for 1 MHz operation, 10 kΩ for 100 kHz, and 2 kΩ for 400 kHz. These values ensure proper rise times (TR ≤ 1000 ns) and bus noise immunity per DS20001710M Section 1.0 and Figure 1-1.

How does hardware write-protection work on the 24FC08-I/ST?

Hardware write-protection on the 24FC08-I/ST is controlled by the WP pin: when tied to VCC, the entire memory array (addresses 000–3FF hex) is locked against write operations while reads remain fully functional. When WP is tied to VSS, normal read/write access is enabled. This feature is implemented entirely in silicon and requires no software commands.

What is the endurance rating and data retention period for the 24FC08-I/ST?

The 24FC08-I/ST is rated for 1,000,000 erase/write cycles and guarantees 200 years of data retention at +25°C, as confirmed in DS20001710M page 1, Features section and Table 1-1. These specifications apply to the 24FC08 variant specifically and exceed those of the 24AA08 (1M cycles) and 24LC08B (1M cycles, 100-year retention).

Is the 24FC08-I/ST pin-compatible with other 24XX08 family members in SOIC-8 package?

Yes, the 24FC08-I/ST is pin-compatible with 24AA08-I/ST and 24LC08B-I/ST in the 8-lead SOIC (SN) package, sharing identical pinout (A0–A2 unused, VSS, SDA, SCL, WP, VCC). However, functional compatibility requires verifying clock speed, voltage range, and temperature grade - the 24FC08-I/ST supports 1 MHz and Extended temp (-40°C to +125°C), unlike the 24AA08-I/ST (400 kHz, Industrial only).