Infineon Technologies FM25H20-DGTR

Overview

FM25H20-DGTR from Infineon Technologies (formerly Cypress) is a 2-Mbit serial SPI F-RAM organized as 256 K × 8, delivering true RAM-like write performance with nonvolatile data retention. It operates at up to 40 MHz SPI clock, supports SPI modes 0 and 3, features hardware/software write protection, and targets industrial data logging and real-time event capture where rapid, reliable writes are critical.

For engineers reviewing the FM25H20-DGTR datasheet, FM25H20-DGTR pinout, FM25H20-DGTR application, or FM25H20-DGTR equivalent, key selection criteria include its NoDelay™ write capability, 10¹⁴ endurance rating, 151-year data retention, low-power sleep mode (3 µA), and drop-in compatibility with serial flash/EEPROM footprints in SOIC-8 and TDFN-8 packages.

Technical Context

The FM25H20-DGTR implements a ferroelectric memory array with zero-write-latency architecture: each byte is committed immediately upon successful SPI transfer without polling or internal erase cycles. Its on-die control logic handles address decoding, status register management, and dual-mode SPI interface synchronization.

Write protection is enforced via three independent mechanisms: hardware WP pin assertion, software WREN/WRDI instruction control, and configurable block protection (1/4, 1/2, or full array) managed through the 3-bit nonvolatile status register. All operations are guaranteed across –40 °C to +85 °C.

Key Specifications

Pinout & Package

FM25H20-DGTR is available in two RoHS-compliant packages: 8-pin SOIC (3.9 mm × 4.9 mm) and 8-pin TDFN (2 mm × 3 mm). The exposed pad on TDFN is unconnected and must be left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MB85RS2MT-FPN-G-BND-ERE1 and AT25DF021A-SHN-T, FM25H20-DGTR uniquely delivers deterministic sub-microsecond writes, 100× higher endurance than flash, and integrated HOLD/WP for robust industrial interrupt handling-making it optimal for real-time data capture systems.

Availability

FM25H20-DGTR is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, and PLC configuration storage requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for FM25H20-DGTR 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, specializing in power management, sensing, connectivity, and memory solutions for industrial, automotive, and IoT applications.

FM25H20-DGTR belongs to Infineon's F-RAM product line, engineered specifically for applications demanding unlimited write endurance, zero write latency, and long-term data integrity without complex firmware overhead.

FAQ

Is FM25H20-DGTR pin-compatible with standard SPI EEPROM or flash devices?

Yes-FM25H20-DGTR uses industry-standard SOIC-8 and TDFN-8 footprints matching common 2-Mbit serial flash and EEPROM packages. Its SPI command set is functionally compatible with standard read/write/opcodes, enabling hardware drop-in replacement without PCB redesign. Pin functions (CS, SCK, SI, SO, WP, HOLD, VDD, VSS) align directly with JEDEC-standard serial memory layouts.

Does FM25H20-DGTR require special initialization or configuration after power-up?

No-FM25H20-DGTR powers up ready for immediate SPI communication. The write enable latch defaults to disabled; users must issue WREN before first write. Status register defaults to unprotected state (WPEN = 0), so hardware WP pin must be tied high if unused. No calibration, trimming, or firmware setup is needed-operation begins on first CS assertion.

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

When HOLD is pulled LOW during any memory operation (read, write, or status access), the FM25H20-DGTR suspends the transaction immediately and tri-states SO. SCK and CS are ignored until HOLD returns HIGH while SCK is LOW. Upon resumption, the device continues from the exact bit position where it paused-ensuring atomicity and eliminating data corruption risk during host CPU context switches.

Can FM25H20-DGTR be used in a 3-wire SPI configuration?

Yes-SI and SO can be wired together (single data line) with appropriate MCU software handling, as confirmed in Cypress Application Note AN98562. This reduces pin count but requires bidirectional GPIO control and disables simultaneous read/write. HOLD and WP pins must still be tied to VDD if unused, and timing margins tighten due to shared signal slew rates.