Microchip Technology 24FC512-I/ST14

Overview

24FC512-I/ST14 from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit memory, operating from 1.7V to 5.5V with 1 MHz clock support, 128-byte page write buffer, and industrial temperature range (–40°C to +85°C) in 14-lead TSSOP package. It enables nonvolatile data storage in space-constrained embedded systems requiring fast write throughput and low standby current.

For engineers reviewing the 24FC512-I/ST14 datasheet, 24FC512-I/ST14 pinout, 24FC512-I/ST14 application, or 24FC512-I/ST14 equivalent, key selection criteria include its 1 MHz I²C speed at V_CC ≥ 2.5V, hardware write-protection via WP pin, Schmitt-trigger noise immunity on SDA/SCL, and cascading capability for up to eight devices on one bus.

Technical Context

The 24FC512-I/ST14 implements a two-wire I²C interface with programmable device addressing via A0–A2 pins, supporting standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes depending on V_CC. Its internal architecture includes a 128-byte page latch, HV generator for EEPROM programming, and address decoder logic enabling contiguous 512 Kbit access across multiple devices when chained.

It uses CMOS EEPROM technology with self-timed erase/write cycles, automatic address pointer incrementing during sequential reads, and acknowledge polling for write-cycle completion detection. The WP pin provides hardware-level protection of the full memory array (0000h–FFFFh) when tied to V_CC, independent of software control.

Key Specifications

Pinout & Package

24FC512-I/ST14 is packaged in a 14-lead Thin Shrink Small Outline Package (TSSOP), 5.0 mm × 6.4 mm body, 0.65 mm lead pitch, with exposed pad option (not electrically connected). Pin 1 is marked by a notch or dot; pins 9–14 are NC (no connect) and must be left unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA512-I/ST14, the 24FC512-I/ST14 delivers 2.5× faster I²C throughput and identical industrial temperature rating, while AT24C512BN-SH-B offers same speed but sacrifices cascading capability and requires PCB redesign due to SOIC-8 packaging.

Availability

24FC512-I/ST14 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy meter firmware storage requiring stable component supply across extended production lifecycles.

Supply support for 24FC512-I/ST14 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24FC512 belongs to Microchip's serial EEPROM product line, engineered for high-speed, low-voltage, and high-reliability nonvolatile storage in industrial, automotive, and medical applications where data integrity and long-term retention are critical.

FAQ

What is the maximum I²C clock frequency supported by the 24FC512-I/ST14?

The 24FC512-I/ST14 supports up to 1 MHz I²C clock frequency when V_CC is 2.5V or higher. At V_CC < 2.5V, the maximum clock rate drops to 400 kHz. This dual-speed capability allows seamless integration into both legacy 400 kHz systems and newer high-throughput designs without changing the 24FC512-I/ST14 part number.

How does the WP pin function on the 24FC512-I/ST14?

The WP (Write-Protect) pin on the 24FC512-I/ST14 is a hardware-level enable/disable control for all write operations. When WP is tied to V_CC, writes to the entire 512 Kbit memory array are inhibited - reads remain fully functional. When WP is tied to V_SS, full read/write access is granted. The pin state is sampled at each Stop condition, ensuring immediate protection activation.

Can multiple 24FC512-I/ST14 devices share the same I²C bus?

Yes, up to eight 24FC512-I/ST14 devices can operate on the same I²C bus using unique combinations of A0, A1, and A2 address inputs. Each device responds only to its assigned 3-bit chip address (bits A2–A0 in the I²C client address 1010 A2 A1 A0 R/W), enabling scalable memory expansion up to 4 Mbit without additional address decoding logic.

What is the page write buffer size of the 24FC512-I/ST14 and why does it matter?

The 24FC512-I/ST14 features a 128-byte page write buffer. This allows the host MCU to transmit up to 128 bytes of data in a single I²C transaction before triggering the internal write cycle. It significantly reduces protocol overhead and bus contention compared to byte-write methods, improving system efficiency in applications like firmware patching or bulk sensor data logging.

Is the 24FC512-I/ST14 qualified for automotive applications?

Yes, the 24FC512-I/ST14 is AEC-Q100 qualified (Grade 2: –40°C to +105°C), making it suitable for automotive body control modules, infotainment systems, and ADAS subsystems. Its 1.7V minimum operating voltage, 1 million endurance cycles, and >200-year data retention meet stringent automotive reliability standards for nonvolatile memory in harsh vehicular environments.