Infineon Technologies FM24CL04B-G

Overview

FM24CL04B-G from Cypress Semiconductor is a 4-Kbit (512 × 8) serial I²C ferroelectric RAM (F-RAM) nonvolatile memory with NoDelay™ write capability, 10¹⁴ read/write endurance, and 151-year data retention at +85 °C. It operates from 2.7 V to 3.65 V across –40 °C to +85 °C and replaces I²C EEPROM in high-write-frequency applications such as industrial data logging and real-time metering.

For engineers reviewing the FM24CL04B-G datasheet, FM24CL04B-G pinout, FM24CL04B-G application, or FM24CL04B-G equivalent, key selection criteria include write speed at bus frequency (up to 1 MHz), absence of write polling, low active current (100 µA @ 100 kHz), WP-controlled hardware write protection, and SOIC-8 drop-in compatibility with legacy I²C EEPROM footprints.

Technical Context

The FM24CL04B-G implements a true nonvolatile RAM architecture using ferroelectric capacitors, 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 embedded in the slave address byte.

It functions exclusively as an I²C slave device with fixed 7-bit slave ID (0xA0–0xA7), supports standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes, and uses Schmitt-triggered SDA/SCL inputs with open-drain outputs requiring external pull-ups.

Key Specifications

Pinout & Package

FM24CL04B-G is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package with gull-wing leads, RoHS-compliant finish, and standard JEDEC MS-012AC footprint (5.3 mm width, 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04D and MB85RC04V, FM24CL04B-G uniquely delivers guaranteed 1-MHz I²C write throughput, validated –40 °C to +85 °C operation, and Cypress's production traceability for industrial OEMs - making it optimal for high-integrity, high-write-rate deployments.

Availability

FM24CL04B-G is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, automotive body control modules, and medical infusion pumps requiring stable component supply and long-term lifecycle assurance.

Supply support for FM24CL04B-G 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 embedded systems, with expertise in nonvolatile memory, PSoC architectures, and USB connectivity.

The FM24CL04B-G belongs to Cypress's F-RAM product line, engineered specifically to replace EEPROM in applications demanding unlimited write endurance, zero-write-latency, and deterministic timing - especially where power interruption or high-frequency logging is routine.

FAQ

Is FM24CL04B-G pin-compatible with standard 4-Kbit I²C EEPROMs like AT24C04?

Yes - FM24CL04B-G uses an 8-pin SOIC package with identical pinout (VDD, VSS, SDA, SCL, WP, A1, A2, NC) and matches the I²C slave address structure (0xA0–0xA7). No PCB redesign is needed; only firmware timing adjustments may be required to remove EEPROM-style polling delays.

Does FM24CL04B-G require external circuitry beyond standard I²C pull-up resistors?

No - it operates with only two external 4.7 kΩ pull-up resistors on SDA and SCL lines, plus standard decoupling (0.1 µF ceramic capacitor near VDD). Unlike EEPROM, it needs no charge-pump circuitry, high-voltage programming pins, or reset supervisors for reliable write operation.

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

The WP pin is internally pulled down; leaving it unconnected defaults to write-enable mode. When tied to VDD, it disables all write operations across the full 512-byte memory map. This hardware lock is active immediately on power-up and requires no initialization code - ideal for protecting calibration data or firmware parameters.

Can FM24CL04B-G operate at 1 MHz while maintaining full write endurance and data retention specs?

Yes - Cypress specifies full 10¹⁴ endurance and 151-year data retention at 1 MHz operation across the full industrial temperature range (–40 °C to +85 °C), as verified in AC switching characteristics and reliability test reports (Document #001-84455 Rev. *L, pages 11–12).