Microchip Technology 24FC512T-I/MS

Overview

24FC512T-I/MS 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). It delivers ultra-low standby current (1 µA max) and supports cascading up to eight devices on a single bus for embedded system configuration storage.

For engineers reviewing the 24FC512T-I/MS datasheet, 24FC512T-I/MS pinout, 24FC512T-I/MS application, or 24FC512T-I/MS equivalent, key selection criteria include 1 MHz I²C timing compliance at 1.7V+, hardware write-protection via WP pin, Schmitt-trigger noise immunity on SDA/SCL, and verified 1 million erase/write cycles with >200-year data retention.

Technical Context

The 24FC512T-I/MS implements a two-wire I²C interface with programmable device addressing via A0–A2 pins, enabling up to eight devices on one bus. Its internal architecture includes a 128-byte page latch, HV generator for EEPROM programming, and memory control logic supporting byte and page writes with self-timed erase/write cycles.

It features Schmitt-trigger inputs on SDA and SCL for robust noise suppression, output slope control to minimize ground bounce, and input filter spike suppression (50 ns). The device samples the WP pin at the Stop bit to enable/disable writes, and uses acknowledge polling to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

24FC512T-I/MS is packaged in an 8-lead MSOP (Micro Small Outline Package), pin-compatible with SOIC-8 and TSSOP-8 footprints but with 3.0 mm × 3.0 mm body and 0.65 mm pitch. This compact surface-mount package supports high-density PCB layouts while maintaining thermal and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA512T-I/MS and AT24C512BN-SH-T, the 24FC512T-I/MS uniquely supports 1 MHz I²C operation across its full 1.7V–5.5V range-enabling faster configuration writes in low-voltage embedded systems without compromising voltage flexibility or endurance.

Availability

24FC512T-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration storage, automotive body control modules, medical device configuration backup, and smart energy meter firmware parameters requiring stable component supply across extended production lifecycles.

Supply support for 24FC512T-I/MS 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, serving industrial, automotive, and consumer markets with high-reliability semiconductor products.

The 24FC512 belongs to Microchip's 24XX512 family of I²C serial EEPROMs, designed specifically for robust, low-power nonvolatile data storage in resource-constrained embedded systems requiring guaranteed write endurance and wide voltage operation.

FAQ

What is the maximum I²C clock frequency supported by the 24FC512T-I/MS across its full voltage range?

The 24FC512T-I/MS supports up to 1 MHz I²C clock frequency when VCC is 2.5V or higher. At VCC between 1.7V and 2.5V, the maximum clock frequency is 400 kHz per Microchip DS20001754Q specification. This dual-speed capability allows the 24FC512T-I/MS to maintain high throughput in both 1.8V and 3.3V/5V systems without redesign.

How does the WP pin function on the 24FC512T-I/MS, and when is it sampled?

The WP (Write-Protect) pin on the 24FC512T-I/MS is sampled at the Stop bit of each write command. When tied to VCC, it disables all write operations-including byte and page writes-while permitting unlimited read access. If tied to VSS, writes are fully enabled. This sampling timing ensures protection remains active even during partial or interrupted write sequences.

What is the page size and write buffer capacity of the 24FC512T-I/MS, and how does it affect programming efficiency?

The 24FC512T-I/MS has a 128-byte page write buffer and physical page boundaries aligned to 128-byte offsets (0x0000, 0x0080, etc.). This allows up to 128 bytes to be loaded into the buffer and written in a single self-timed cycle (≤5 ms), significantly reducing I²C transaction count versus byte-by-byte writes and improving host CPU utilization during bulk data updates.

Does the 24FC512T-I/MS support cascading with other I²C EEPROMs, and how many devices can share one bus?

Yes, the 24FC512T-I/MS supports cascading via three hardware address pins (A0, A1, A2), allowing up to eight devices on a single I²C bus. Each device is assigned a unique 3-bit chip address, enabling contiguous 4 Mbit address space expansion when multiple 24FC512T-I/MS units are deployed-ideal for systems requiring scalable nonvolatile storage.

What are the absolute maximum ratings and operating temperature range for the 24FC512T-I/MS?

The 24FC512T-I/MS has an absolute maximum VCC rating of 6.5V and operates across the industrial temperature range of –40°C to +85°C. Its DC characteristics are specified for VCC = 1.7V to 5.5V and TA = –40°C to +85°C, making it suitable for harsh environments including automotive under-hood and industrial control cabinets.