Microchip Technology 24FC512T-I/OT

Overview

24FC512T-I/OT from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 1 MHz max clock frequency at V_CC ≥ 2.5V, and hardware write-protect via WP pin. It enables nonvolatile data storage in space-constrained embedded control systems requiring low-power, noise-immune bus interfacing.

For engineers reviewing the 24FC512T-I/OT datasheet, 24FC512T-I/OT pinout, 24FC512T-I/OT application, or 24FC512T-I/OT equivalent, key selection criteria include its 1 MHz I²C speed at 1.7–5.5V supply, 128-byte page buffer, 5 ms max page write time, Schmitt-trigger inputs for noise immunity, and 8-lead SOT-23 package with verified pin mapping.

Technical Context

The 24FC512T-I/OT implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, supports up to eight devices on one bus via A0–A2 address inputs, and uses internal address pointer logic for current-address, random, and sequential read modes. Its architecture includes a 128-byte page latch, HV generator for EEPROM programming, and write-protection logic sampling WP at Stop condition.

It features Schmitt-trigger inputs (SDA/SCL) with 0.05×V_CC hysteresis and slope-controlled outputs to suppress ground bounce. AC timing meets 1 MHz operation down to 2.5V (T_LOW/T_HIGH ≤ 500 ns, T_F ≤ 100 ns), while DC specs guarantee ≤400 µA active current and ≤1 µA standby current across –40°C to +85°C.

Key Specifications

Pinout & Package

24FC512T-I/OT is supplied in an 5-lead SOT-23 package (JEDEC MO-178AA), with body dimensions 2.9 mm × 1.6 mm × 1.1 mm and gull-wing leads. Pin 1 is marked by a dot; lead pitch is 0.95 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA512T-I/OT and AT24C512-SSH-T, the 24FC512T-I/OT uniquely combines 1 MHz I²C speed, 1.7V operation, and 5-lead SOT-23 packaging-enabling high-throughput, ultra-compact, low-voltage embedded storage where pin count and board area are constrained.

Availability

24FC512T-I/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering applications requiring stable component supply and long-term lifecycle support.

Supply support for 24FC512T-I/OT 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 manufacturing and support infrastructure.

The 24FC512 belongs to Microchip's 24XX512 family of I²C serial EEPROMs, designed specifically for reliable, low-power, space-efficient nonvolatile data storage in embedded systems operating across extended voltage and temperature ranges.

FAQ

What is the maximum I²C clock frequency supported by the 24FC512T-I/OT?

The 24FC512T-I/OT supports up to 1 MHz I²C clock frequency when V_CC is 2.5V or higher. At V_CC between 1.7V and 2.5V, the maximum clock frequency is limited to 400 kHz. This dual-speed capability is explicitly defined in Microchip's DS20001754Q datasheet, Table 1-2, and distinguishes the 24FC512T-I/OT from the 24AA512 and 24LC512 variants.

Does the 24FC512T-I/OT require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC512T-I/OT requires external pull-up resistors on both SDA and SCL lines because these pins are open-drain. Recommended values are 2 kΩ for 1 MHz operation and 10 kΩ for 100 kHz; resistor choice must balance rise time, bus capacitance, and drive strength per I²C specification. The 24FC512T-I/OT itself does not integrate internal pull-ups.

How is hardware write-protection implemented on the 24FC512T-I/OT?

Hardware write-protection on the 24FC512T-I/OT is controlled by the WP pin: when tied to V_CC, all write operations (byte and page) are inhibited while reads remain functional; when tied to V_SS, writes are enabled. The WP state is sampled at the Stop condition of each write command, making protection immune to transient glitches during active transfers.

What is the page size and maximum write time for the 24FC512T-I/OT?

The 24FC512T-I/OT has a 128-byte page write buffer, and its maximum self-timed write cycle time is 5 ms for both byte and page writes. This value is guaranteed across the full industrial temperature range (–40°C to +85°C) and supply voltage (1.7V–5.5V), as specified in DS20001754Q, Table 1-1 and Figure 1-1.

Is the 24FC512T-I/OT AEC-Q100 qualified?

Yes, the 24FC512T-I/OT is AEC-Q100 qualified per the device selection table in DS20001754Q, which states "Automotive AEC-Q100 Qualified" for the 24FC512 family. This qualification applies to the industrial temperature grade (I), covering –40°C to +85°C, and confirms reliability for automotive body electronics and infotainment subsystems.