Infineon Technologies FM25V02A-DGTR

Overview

FM25V02A-DGTR from Infineon Technologies (formerly Cypress) is a 256-Kbit serial SPI F-RAM organized as 32K × 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 write protection via WP pin, and guarantees 10¹⁴ read/write cycles with 151-year data retention over –40 °C to +85 °C. It serves as a direct hardware replacement for serial EEPROM/flash in high-frequency data logging systems.

For engineers reviewing the FM25V02A-DGTR datasheet, FM25V02A-DGTR pinout, FM25V02A-DGTR application, or FM25V02A-DGTR equivalent, key selection criteria include NoDelay™ write capability, industrial-temperature SPI timing compliance, VDD = 2.0–3.6 V operation, WP/HOLD pin behavior, and SOIC-8 vs. DFN-8 package compatibility in space-constrained embedded designs.

Technical Context

The FM25V02A-DGTR implements a ferroelectric memory array with zero-write-latency architecture: writes complete synchronously with SPI bus transfer-no polling or delay required. Its internal logic includes a dedicated instruction decoder, address counter, and nonvolatile status register supporting software block protection (1/4, 1/2, or full array).

It functions strictly as an SPI slave device with fixed opcode-based command structure (WREN, WRDI, RDSR, WRSR, READ, FAST_READ, WRITE), uses rising-edge SCK sampling for SI and falling-edge SCK driving for SO, and maintains tristate SO during CS HIGH or HOLD LOW states-ensuring deterministic bus arbitration in multi-device SPI systems.

Key Specifications

Pinout & Package

FM25V02A-DGTR is supplied in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch) with gull-wing leads. Pin assignments are electrically identical to the DFN variant but mechanically optimized for through-hole prototyping and reflow-compatible surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MB85RS2MT-FPN-GE1 and AT25SF041B-MAHB-T, FM25V02A-DGTR uniquely balances 32K × 8 density, 40 MHz deterministic writes, HOLD-enabled bus arbitration, and industrial temperature support-making it optimal for real-time embedded logging where latency, reliability, and pin count are constrained.

Availability

FM25V02A-DGTR is available at Aetrix Electronics and suitable for industrial data loggers, smart meter firmware storage, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for FM25V02A-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 security solutions for industrial, automotive, and IoT markets.

The FM25V02A-DGTR belongs to Infineon's F-RAM product line-designed specifically for applications demanding ultra-high endurance, zero-write-latency nonvolatility, and seamless SPI drop-in replacement of legacy EEPROM and flash in resource-constrained embedded systems.

FAQ

What is the function of the HOLD pin during an active SPI transaction?

The HOLD pin suspends the current SPI operation (read or write) when pulled LOW while SCK is LOW. The device retains internal state-including address pointer and status register contents-and ignores subsequent SCK and CS transitions until HOLD returns HIGH. This enables the host CPU to temporarily reclaim the SPI bus for higher-priority tasks without aborting or restarting the memory operation.

Does FM25V02A-DGTR require external pull-up resistors on SI, SO, or WP pins?

WP must be externally pulled to VDD if unused, as its internal pull-up is weak and insufficient to guarantee logic HIGH under noise or leakage. SI and SO do not require external pull-ups: SI is actively driven by the master, and SO is tristated when inactive. The HOLD pin has a weak internal pull-up (typ. 100 kΩ), but a 10 kΩ external pull-up is recommended for robust noise immunity in noisy industrial environments.

How does the FM25V02A-DGTR handle power loss during a write operation?

Because FM25V02A-DGTR performs NoDelay™ writes-completing each byte write synchronously with the SPI frame-the device guarantees atomicity at the byte level. If VDD drops mid-transaction, only the last incomplete byte may be corrupted; all previously transferred bytes are fully committed to the ferroelectric array. No erase cycle or write buffer is involved, eliminating flash-style partial-write corruption risks.

Can FM25V02A-DGTR be used with microcontrollers lacking native SPI hardware?

Yes-FM25V02A-DGTR supports bit-banged SPI using general-purpose I/O pins. Its synchronous protocol (rising-edge sampling, falling-edge output) and lack of timing-critical internal delays allow reliable emulation at ≤1 MHz clock rates. The HOLD and WP pins can be tied HIGH to reduce required GPIO count to three (CS, SCK, bidirectional SI/SO), simplifying integration with low-pin-count MCUs.