Microchip Technology 24FC1025T-I/SM

Overview

24FC1025T-I/SM 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 system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 24FC1025T-I/SM datasheet, 24FC1025T-I/SM pinout, 24FC1025T-I/SM application, or 24FC1025T-I/SM equivalent, key selection criteria include its 1 MHz I²C speed at V_CC ≥ 2.5 V, 5 µA standby current, 3 ms typical page write time, and SOIC-8 package compatibility with board-level space constraints and thermal requirements.

Technical Context

The 24FC1025T-I/SM implements a two-wire I²C interface with slave addressing using A0/A1 pins and mandatory A2 tied to V_CC, enabling up to four devices on one bus. Its internal architecture includes a 128-byte page latch, EEPROM array segmented into two 512 kbit blocks (00000h–0FFFFh and 10000h–1FFFFh), and address pointer auto-increment for sequential reads.

Write operations support byte and page modes with self-timed erase/write cycles; write protection is controlled by the WP pin sampled at the Stop bit. Schmitt-trigger inputs on SDA/SCL and output slope control suppress ground bounce and improve noise immunity in noisy industrial environments.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (3.90 mm body width, 1.27 mm pitch), RoHS-compliant, Pb-free matte tin finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA1025T-I/SM and AT24C1024-SSHL-T, the 24FC1025T-I/SM uniquely delivers 1 MHz I²C performance at 1.8 V minimum supply while retaining full pin compatibility and 128-byte page efficiency-making it optimal for high-throughput embedded configuration storage where timing margins are tight.

Availability

24FC1025T-I/SM is available at Aetrix Electronics and suitable for industrial PLCs, medical sensor modules, smart energy meters, and automotive body control units requiring stable component supply across extended production lifecycles.

Supply support for 24FC1025T-I/SM 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/SM belongs to Microchip's high-speed serial EEPROM product line, designed specifically for industrial and automotive systems demanding fast, low-power, and robust nonvolatile data storage.

FAQ

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

The 24FC1025T-I/SM 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 is 400 kHz. This dual-speed capability allows system designers to optimize for speed in 3.3 V/5 V domains or maintain functionality in ultra-low-voltage 1.8 V applications. The 24FC1025T-I/SM datasheet specifies these limits in Table 1-2 under FCLK conditions.

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

The WP (Write-Protect) pin on the 24FC1025T-I/SM is sampled at the Stop condition of each write command. When tied to V_CC, it disables all write operations-including byte and page writes-while permitting unrestricted reads. If tied to V_SS, writes are enabled. The 24FC1025T-I/SM acknowledges write commands even when WP is active, but no data is programmed. This behavior is documented in Section 6.3 and Figure 1-1 of the DS20001941L datasheet.

What is the memory organization of the 24FC1025T-I/SM?

The 24FC1025T-I/SM contains 1024 kbit (128K × 8) of EEPROM organized into two 512 kbit blocks: addresses 00000h–0FFFFh and 10000h–1FFFFh. Access to each block is controlled by the B0 bit in the I²C control byte. Sequential reads wrap within each block but do not cross boundaries. This segmentation enables independent firmware bank storage or redundant calibration data sets, as defined in Section 5.0 and Figure 5-2 of the 24FC1025T-I/SM datasheet.

Can the 24FC1025T-I/SM be used with a 1.8 V microcontroller?

Yes, the 24FC1025T-I/SM operates across 1.8 V to 5.5 V, making it fully compatible with 1.8 V logic-level microcontrollers. Its I²C interface meets standard voltage thresholds: VIH ≥ 0.7×V_CC and VIL ≤ 0.3×V_CC. At 1.8 V, the maximum clock frequency is 400 kHz, and DC characteristics including 450 µA read current and 5 µA standby current remain valid per Table 1-1. This is confirmed in the Device Selection Table and Electrical Characteristics sections of the 24FC1025T-I/SM datasheet.

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

The 24FC1025T-I/SM uses an 8-lead SOIC (Small Outline Integrated Circuit) package with 3.90 mm body width and 1.27 mm lead pitch, marked "I/SM" per Microchip's packaging specification. It is RoHS-compliant and features Pb-free matte tin (Sn) termination. Package dimensions and marking details are specified in Section 9.0 and Figure 9-1 of the DS20001941L datasheet, and the "T-I/SM" suffix explicitly denotes this SOIC variant.