Microchip Technology 24FC02T-I/ST

Overview

24FC02T-I/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), 8-byte page write buffer, and industrial/extended temperature operation (-40°C to +125°C). It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-power, noise-immune bus interfacing.

For engineers reviewing the 24FC02T-I/ST datasheet, 24FC02T-I/ST pinout, 24FC02T-I/ST application, or 24FC02T-I/ST equivalent, key selection criteria include its 1.7V–5.5V supply range, Schmitt-triggered I²C inputs, 5 ms max page write time, >1 million endurance cycles, and compatibility with standard I²C host controllers across automotive, industrial, and embedded platforms.

Technical Context

The 24FC02T-I/ST implements a two-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control, supporting byte and page write modes with automatic address pointer increment. Its internal architecture includes a high-voltage generator for EEPROM programming, page latches for buffered writes, and dedicated I/O control logic managing SDA open-drain timing and WP input validation.

It features Schmitt-trigger inputs on SCL/SDA with 50 ns spike suppression and hysteresis ≥0.05×VCC, slope-controlled outputs to minimize ground bounce, and ACK polling capability to detect write completion without fixed delay timing-enabling deterministic bus arbitration in multi-device systems.

Key Specifications

Pinout & Package

24FC02T-I/ST is supplied in an 8-lead SOIC package (ST suffix), with pins arranged as follows:

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24FC02T-I/ST, the 24AA02T-I/ST trades 1 MHz performance for broader legacy compatibility, while AT24C02D-SSHM-T offers matching speed but lacks extended temperature qualification and uses functional address pins-requiring layout and firmware adjustments.

Availability

24FC02T-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and IoT edge device identity applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified traceability.

Supply support for 24FC02T-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 leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24FC02T-I/ST belongs to Microchip's 24XX02 family of serial EEPROMs, designed specifically for reliable, low-voltage, noise-immune nonvolatile storage in space-constrained embedded systems across automotive, industrial, and consumer markets.

FAQ

What is the maximum I²C clock frequency supported by the 24FC02T-I/ST?

The 24FC02T-I/ST supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range. This is confirmed in the Device Selection Table and AC Characteristics section of DS20001709N, distinguishing it from the 24AA02 (max 400 kHz) and 24LC02B (max 400 kHz, minimum 2.5V). The 24FC02T-I/ST maintains this speed even at 1.7V, enabling faster configuration writes in low-power systems.

Does the 24FC02T-I/ST require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC02T-I/ST requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values are 2 kΩ for 1 MHz operation and 10 kΩ for 100 kHz, as specified in the Serial Address/Data Input/Output (SDA) section of DS20001709N. Without proper pull-ups, bus communication will fail due to undefined signal levels.

How does hardware write-protection work on the 24FC02T-I/ST?

Hardware write-protection on the 24FC02T-I/ST is controlled by the WP pin: when tied to VCC, the entire memory array (addresses 00–FF) is locked against write operations while reads remain fully functional; when tied to VSS, normal read/write access is enabled. This behavior is explicitly defined in Section 2.4 of DS20001709N and requires no software command or internal register setting.

Is the 24FC02T-I/ST AEC-Q100 qualified?

Yes, the 24FC02T-I/ST is AEC-Q100 qualified, as stated in the Features section of DS20001709N. This qualification applies to the Extended temperature grade (–40°C to +125°C), confirming its suitability for automotive applications such as engine control, body electronics, and ADAS subsystems where reliability under thermal stress is mandatory.

What is the purpose of the A0, A1, and A2 pins on the 24FC02T-I/ST?

The A0, A1, and A2 pins on the 24FC02T-I/ST are not internally connected and serve no functional role, as confirmed in Section 2.1 and Table 2-1 of DS20001709N. They may be left floating or tied to VSS or VCC without affecting device operation-unlike other EEPROM families where these pins configure slave address. This simplifies PCB layout and eliminates address conflict concerns in multi-device I²C systems.