Infineon Technologies FM24C04B-GTR

Overview

FM24C04B-GTR from Cypress Semiconductor is a 4-Kbit (512 × 8) serial I²C ferroelectric RAM (F-RAM) nonvolatile memory IC, functioning as a drop-in hardware replacement for I²C EEPROM in embedded control and data logging systems. It delivers NoDelay™ writes, 10¹⁴ read/write endurance, 151-year data retention at +85 °C, operates from 4.5–5.5 V, and is AEC-Q100 Grade 3 qualified.

For engineers reviewing the FM24C04B-GTR datasheet, FM24C04B-GTR pinout, FM24C04B-GTR application, or FM24C04B-GTR equivalent, key selection criteria include write-cycle speed without polling, industrial temperature operation (–40 °C to +85 °C), I²C bus compatibility up to 1 MHz, and SOIC-8 package integration with WP and address pins (A1/A2).

Technical Context

The FM24C04B-GTR implements a true nonvolatile RAM architecture using ferroelectric capacitor-based memory cells, enabling byte-level writes at I²C bus speed without internal write cycles or voltage boosting. Its 9-bit addressing scheme combines an 8-bit word address with a 1-bit page select bit, mapping to a 512-byte linear space split across two 256-byte pages.

It functions exclusively as an I²C slave device with fixed 7-bit slave address prefix 1010b, where bits A2–A1 configure device selection (up to four devices per bus), and the R/W bit determines transaction direction. The WP pin provides hardware-level write protection across the full memory map when driven high.

Key Specifications

Pinout & Package

FM24C04B-GTR is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package with standard 1.27 mm pitch and gull-wing leads, suitable for reflow soldering and automated PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04D-SSHM-T, FM24C04B-GTR eliminates write latency and extends lifetime by 100 million×; versus MB85RC04V, it offers tighter AEC-Q100 Grade 3 validation and fixed 5 V operation ideal for legacy 5 V automotive subsystems.

Availability

FM24C04B-GTR is available at Aetrix Electronics and suitable for industrial data loggers, automotive telematics units, smart meter firmware stores, and medical infusion pump configuration memory requiring stable component supply and long-term lifecycle assurance.

Supply support for FM24C04B-GTR 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-reliability semiconductor solutions for automotive, industrial, and IoT applications, with expertise in nonvolatile memory and microcontroller systems.

The FM24C04B-GTR belongs to Cypress's F-RAM product line, engineered specifically to replace EEPROM in applications demanding extreme write endurance, zero-write-latency, and robust operation across harsh temperature and power environments.

FAQ

Is FM24C04B-GTR pin-compatible with standard 4-Kbit I²C EEPROMs like the AT24C04?

Yes - FM24C04B-GTR uses an 8-pin SOIC package with identical pinout (A1, A2, SDA, SCL, WP, VSS, VDD, NC) and matches the I²C timing specifications of legacy EEPROMs including START/STOP conditions, ACK timing, and clock stretching behavior. No PCB redesign is needed for migration.

Does FM24C04B-GTR require special I²C bus configuration or pull-up resistor values?

No - it uses standard open-drain I²C signaling with Schmitt-triggered inputs and operates with typical 4.7 kΩ pull-ups on 5 V buses. Its 1 MHz capability is supported with standard layout practices; no additional bus capacitance derating or slew-rate limiting is required beyond standard I²C design rules.

How does the WP pin function, and what happens when it is left floating?

The WP pin is internally pulled down; if left unconnected, it defaults to logic LOW, enabling full memory write access. When driven HIGH to VDD, it disables writes to all 512 bytes. This hardware lockout is active regardless of I²C command state and cannot be overridden by software - critical for fail-safe configuration protection.

Can FM24C04B-GTR be used in 3.3 V systems?

No - its specified VDD range is strictly 4.5 V to 5.5 V. Operation below 4.5 V risks incomplete write verification, data corruption, or failure to meet AEC-Q100 Grade 3 specifications. For 3.3 V systems, consider MB85RC04V or CY15B104QN, which are explicitly rated for 2.7–3.6 V operation.