Infineon Technologies FM25V20-G

Overview

FM25V20-G from Infineon Technologies (formerly Cypress) is a 2-Mbit serial SPI ferroelectric RAM (F-RAM) logically organized as 256 K × 8, operating at up to 40 MHz with 2.0–3.6 V supply, 10¹⁴ read/write endurance, and 151-year data retention. It serves as a hardware-compatible nonvolatile memory replacement for serial flash and EEPROM in real-time data logging and industrial control systems.

For engineers reviewing the FM25V20-G datasheet, FM25V20-G pinout, FM25V20-G application, or FM25V20-G equivalent, key selection criteria include NoDelay™ write performance, SPI Mode 0/3 compatibility, hardware/software write protection, and industrial temperature support (–40 °C to +85 °C).

Technical Context

The FM25V20-G implements a synchronous SPI slave interface supporting Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), with data latched on SCK rising edge and output on falling edge. Its internal architecture includes an 18-bit address counter, nonvolatile status register, and Device ID register containing manufacturer and product identifiers.

Write operations execute at bus speed without polling-each byte is committed immediately upon successful SPI transfer. The device features dual-layer write protection: hardware-level via active-low WP pin (when WPEN = 1) and software-configurable block protection (1/4, 1/2, or full array) controlled through the status register.

Key Specifications

Pinout & Package

FM25V20-G is available in two RoHS-compliant packages: 8-pin SOIC (3.9 mm × 4.9 mm) and 8-pin TDFN (2 mm × 3 mm) with exposed pad (unconnected). Both packages share identical pin functions and ordering code suffix "-G" denotes SOIC variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MB85RS2MT-FPNSE1 and AT25SF041B-SSHD-B, FM25V20-G uniquely delivers 40 MHz write bandwidth, 10¹⁴ endurance, and 151-year retention in a single SPI-compatible package - making it the only option for high-frequency, long-lifetime, latency-critical nonvolatile storage.

Availability

FM25V20-G is available at Aetrix Electronics and suitable for smart meter data logging, industrial PLC event buffering, medical sensor calibration storage, and automotive telematics black box applications requiring stable component supply across extended product lifecycles.

Supply support for FM25V20-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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, delivering power management, sensing, connectivity, and security solutions for industrial, automotive, and IoT markets.

FM25V20-G belongs to Infineon's F-RAM portfolio - engineered specifically for applications demanding infinite write endurance, instant nonvolatile storage, and elimination of flash/EEPROM write bottlenecks in real-time systems.

FAQ

Is FM25V20-G pin-compatible with standard SPI EEPROMs or flash devices?

Yes - FM25V20-G uses an industry-standard 8-pin SOIC footprint and SPI command set compatible with common serial EEPROMs (e.g., AT25xxx) and flash (e.g., SST25xxx). Pin assignments (CS, SCK, SI, SO, WP, HOLD, VDD, VSS) match directly, enabling drop-in replacement without PCB redesign.

Does FM25V20-G require external high-voltage programming or special write sequences?

No - FM25V20-G performs true RAM-like writes: data is committed instantly upon receipt of each byte over SPI. There are no erase cycles, no high-voltage pulses, no write-enable wait states, and no polling required. A simple WREN instruction enables writes, then standard WRITE opcodes proceed at full bus speed.

How does the HOLD pin function during active memory operations?

The HOLD pin suspends any ongoing SPI transaction (read or write) when pulled LOW while SCK is LOW. The device retains internal state and resumes exactly where it left off when HOLD returns HIGH. This allows microcontrollers to temporarily halt memory access for higher-priority tasks without losing data integrity or requiring re-initialization.

What is the purpose of the EXPOSED PAD on the TDFN package?

The EXPOSED PAD on the 8-pin TDFN variant is electrically unconnected to the die and must remain floating. It serves solely as a thermal and mechanical anchor - improving heat dissipation and solder joint reliability - but carries no signal or power function. PCB layout should isolate it from ground or voltage planes.