Microchip Technology 24FC1025T-I/SN

Overview

24FC1025T-I/SN from Microchip Technology Inc. is a 128K × 8 (1024 kbit) I²C-compatible serial EEPROM with 1 MHz maximum clock frequency, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features 128-byte page write buffer, hardware write-protection via WP pin, and Schmitt-trigger inputs for noise immunity. Used in embedded systems for firmware storage, calibration data retention, and configuration parameter backup.

For engineers reviewing the 24FC1025T-I/SN datasheet, 24FC1025T-I/SN pinout, 24FC1025T-I/SN application, or 24FC1025T-I/SN equivalent, key selection criteria include I²C speed compatibility (1 MHz at V_CC ≥ 2.5 V), page-write timing (3 ms typical), endurance (1 million cycles), and package-specific layout constraints for 8-lead SOIC.

Technical Context

The 24FC1025T-I/SN implements a two-wire I²C interface with master-controlled clock (SCL) and bidirectional open-drain data (SDA), requiring external pull-up resistors. Its internal address counter supports sequential reads across two 512 kbit blocks (00000h–0FFFFh and 10000h–1FFFFh), with block select bit B0 in the control byte determining segment access.

Write protection is enforced by the WP pin: tied to V_CC, it inhibits all writes while permitting reads; tied to V_SS, full read/write capability is enabled. The A2 pin is non-configurable and must be hard-wired to V_CC; A0 and A1 provide user-selectable chip addressing for up to four devices on one bus.

Key Specifications

Pinout & Package

8-lead SOIC (3.90 mm width) package with standard JEDEC outline; RoHS-compliant matte tin finish; marked "24FC1025I/SN" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC1025-I/SN, the 24FC1025T-I/SN delivers 2.5× faster writes and 1.8 V operation, while AT24C1024-SSHL-T offers identical speed but relaxed pin constraints-making it preferable for space-constrained layouts where A2 routing is problematic.

Availability

24FC1025T-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for 24FC1025T-I/SN 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 company specializing in microcontrollers, analog devices, and memory solutions for embedded control applications.

The 24FC1025T-I/SN belongs to Microchip's FC-series serial EEPROM family, designed specifically for high-speed, low-voltage I²C systems where fast firmware updates and broad supply voltage tolerance are essential.

FAQ

What is the maximum I²C clock frequency supported by the 24FC1025T-I/SN?

The 24FC1025T-I/SN supports up to 1 MHz I²C clock frequency when V_CC is 2.5 V or higher. At 1.8–2.4 V, the maximum clock rate drops to 400 kHz. This dual-speed capability allows designers to optimize for speed in 3.3 V/5 V systems or maintain compatibility in 1.8 V ultra-low-power designs-both within a single part number.

How does the WP pin function on the 24FC1025T-I/SN?

The WP (Write-Protect) pin on the 24FC1025T-I/SN disables all write operations-including byte and page writes-when held high (tied to V_CC). Reads remain fully functional. The pin is sampled only at the Stop condition of each write command, so toggling WP mid-operation has no effect. This behavior makes the 24FC1025T-I/SN suitable for protecting bootloader configuration data in mission-critical systems.

What is the purpose of the A2 pin on the 24FC1025T-I/SN?

The A2 pin on the 24FC1025T-I/SN is a non-configurable chip select input that must be permanently tied to V_CC for proper operation. Unlike A0 and A1, A2 is not used for address selection-it serves as an enable signal. If left floating or connected to V_SS, the device enters an undefined state and will not respond to I²C commands. This design ensures deterministic initialization in systems with multiple EEPROMs.

Can the 24FC1025T-I/SN perform sequential reads across its entire 1024 kbit memory space?

No-the 24FC1025T-I/SN divides its memory into two 512 kbit segments (00000h–0FFFFh and 10000h–1FFFFh), and sequential reads automatically roll over within each segment but cannot cross the boundary between them. To read the full array sequentially, software must issue separate read commands for each block, using the B0 bit in the control byte to select the target segment. This architectural constraint is inherent to the 24FC1025T-I/SN's internal addressing logic.

What package type is used for the 24FC1025T-I/SN?

The 24FC1025T-I/SN uses an 8-lead SOIC (Small Outline Integrated Circuit) package with 3.90 mm body width and standard JEDEC MS-012AC outline. It features RoHS-compliant matte tin (Sn) plating, Pb-free construction, and laser-marked identification including "24FC1025I/SN", year-week date code, and traceability codes. This package is compatible with standard surface-mount assembly processes and automated optical inspection.