Infineon Technologies FM25H20-GTR

Overview

FM25H20-GTR from Infineon Technologies (formerly Cypress) is a 2-Mbit serial SPI F-RAM memory organized as 256 K × 8, featuring NoDelay™ writes, 10¹⁴ read/write endurance, 151-year data retention, 40-MHz SPI interface, and industrial temperature range (–40 °C to +85 °C). It serves as a hardware-compatible replacement for serial flash/EEPROM in high-write-frequency data logging and industrial control systems.

For engineers reviewing the FM25H20-GTR datasheet, FM25H20-GTR pinout, FM25H20-GTR application, or FM25H20-GTR equivalent, key selection criteria include write latency (zero wait states), endurance margin vs. EEPROM, SPI mode 0/3 compatibility, VDD range (2.7–3.6 V), and dual-package availability (SOIC-8/TDFN-8).

Technical Context

The FM25H20-GTR implements ferroelectric nonvolatile memory cells enabling true RAM-like write behavior without erase cycles or polling. Its internal architecture includes an 18-bit address decoder, 3-byte SPI command parser, and nonvolatile status register with WPEN bit controlling hardware write protection via the WP pin.

It operates exclusively as an SPI slave supporting modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), with all data latched on SCK rising edge and output on falling edge. The HOLD pin suspends ongoing transfers synchronously when asserted low while SCK is low, preserving bus state integrity during host interrupts.

Key Specifications

Pinout & Package

FM25H20-GTR 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 share identical pin functions and ordering code suffix "-GTR" denotes tape-and-reel packaging.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY14B102QN-SP and AT25SF041-SSHD-B, FM25H20-GTR uniquely delivers zero-latency writes and 10¹⁴ endurance in an SPI-compatible 8-pin package-making it irreplaceable for high-frequency data capture where timing determinism and longevity are mandatory.

Availability

FM25H20-GTR is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC data logging, automotive body control modules, and medical diagnostic equipment requiring stable component supply across multi-year production programs.

Supply support for FM25H20-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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, delivering power systems, sensors, and memory solutions for industrial, automotive, and IoT applications.

The FM25H20-GTR belongs to Infineon's F-RAM product line, engineered specifically for applications demanding unlimited write endurance, deterministic write timing, and long-term data integrity without backup power or complex firmware management.

FAQ

Is FM25H20-GTR pin-compatible with standard SPI EEPROMs like AT25DF041?

Yes, FM25H20-GTR shares identical 8-pin SOIC/TDFN footprints and SPI command set (including WREN, WRDI, RDSR, WRSR, READ, WRITE) with common serial EEPROMs. It responds to the same opcodes and address formats, enabling drop-in replacement without PCB redesign-though firmware polling loops must be removed due to its NoDelay™ write capability.

Does FM25H20-GTR require external high-voltage programming circuitry?

No. Unlike EEPROM and flash, FM25H20-GTR performs writes using standard VDD (2.7–3.6 V) with no charge pump or high-voltage generator. All operations-including status register writes and memory writes-execute at core logic voltage, simplifying power design and eliminating HV-related noise coupling risks in sensitive analog systems.

How does the HOLD pin behave during an active write operation?

When HOLD is pulled LOW while SCK is LOW, the FM25H20-GTR immediately suspends the current SPI transaction-whether read, write, or status access-and tri-states SO. The internal address counter and command state are preserved. Upon returning HOLD to HIGH (with SCK still LOW), the device resumes exactly where it left off, ensuring atomicity across interrupted transfers in real-time systems.

What is the significance of the "PRELIMINARY" status in the datasheet?

The "PRELIMINARY" designation reflects that the FM25H20 was released prior to full production qualification-however, Infineon confirms full manufacturing release and long-term supply commitment. All electrical specifications, reliability data (10¹⁴ endurance, 151-year retention), and package qualifications are final and production-tested per AEC-Q100 stress standards for industrial use.