Infineon Technologies FM25V10-DG

Overview

FM25V10-DG from Cypress Semiconductor is a 1-Mbit (128K × 8) serial SPI ferroelectric RAM (F-RAM) with no-write-delay operation, 10¹⁴ read/write endurance, and 151-year data retention at +85 °C. It operates from 2.0 V to 3.6 V over –40 °C to +85 °C and delivers up to 40 MHz SPI throughput in Mode 0/3 - used in industrial data loggers for real-time sensor timestamping without write latency.

For engineers reviewing the FM25V10-DG datasheet, FM25V10-DG pinout, FM25V10-DG application, or FM25V10-DG equivalent, key selection criteria include guaranteed bus-speed writes, hardware/software write protection granularity (1/4–full array), unique serial number support (FM25VN10 variant), and RoHS-compliant 8-pin SOIC/DFN packaging with tristatable SO and HOLD suspend capability.

Technical Context

The FM25V10-DG implements a synchronous SPI slave interface with dual-mode support (Mode 0 and Mode 3), where SI latches on SCK rising edge and SO drives on falling edge. Its internal F-RAM array eliminates erase cycles and polling, enabling immediate byte-level write completion after each SPI byte transfer.

Write protection is enforced via three independent mechanisms: hardware WP pin (active-low), software WREN/WRDI instructions, and programmable block protection bits in the nonvolatile status register. The device also integrates a read-only Device ID (manufacturer + density + revision) and optional unique serial number (FM25VN10).

Key Specifications

Pinout & Package

FM25V10-DG is supplied in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch) with gull-wing leads and standard JEDEC MS-012AC footprint. Pin functions are electrically validated per Cypress Document 001-84499 Rev. *K.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MB85RS1MT-FPNSE1 and AT25SF041-SSHD-B, FM25V10-DG uniquely combines guaranteed bus-speed writes, 151-year retention at full temperature range, and integrated hardware/software write protection - making it the sole option for mission-critical, high-write industrial logging where data integrity and longevity are non-negotiable.

Availability

FM25V10-DG is available at Aetrix Electronics and suitable for industrial data loggers, smart meter firmware storage, and medical diagnostic sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for FM25V10-DG 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 nonvolatile memory and PSoC solutions for industrial, automotive, and IoT applications.

The FM25V10 belongs to Cypress's F-RAM product line, engineered specifically to replace serial flash and EEPROM in applications demanding extreme write endurance, zero-latency writes, and extended data retention without battery backup.

FAQ

Is FM25V10-DG pin-compatible with standard 8-pin SOIC serial flash or EEPROM devices?

Yes - FM25V10-DG uses industry-standard SOIC-8 pinout (CS, SCK, SI, SO, WP, HOLD, VSS, VDD) and supports identical SPI command opcodes (e.g., 0x03 Read, 0x02 Write, 0x05 RDSR). No PCB redesign is needed for drop-in replacement of devices like AT25DF041 or SST25VF040B, though timing margins improve significantly due to absence of write delays.

Does FM25V10-DG require external circuitry for write protection?

No - FM25V10-DG integrates three-tiered write protection: hardware (WP pin), software (WREN/WRDI instructions), and configurable block protection (1/4, 1/2, or full array) via status register bits BP0/BP1. External resistors or logic gates are unnecessary unless custom system-level locking is required beyond the device's native capabilities.

What is the maximum sustainable write throughput for continuous logging?

At 40 MHz SPI clock with 8-bit data transfers, FM25V10-DG achieves 5 MB/s theoretical bandwidth. Real-world sustained throughput is ~4.2 MB/s due to opcode/address overhead, supporting continuous 128 KB buffer fills in under 31 ms - sufficient for 100 Hz sampling of 32-bit sensor streams across eight channels.

How does HOLD pin behavior differ from standard SPI slave suspend functionality?

HOLD suspends *any* active memory operation (read, write, status access) mid-byte without corrupting data or requiring reinitialization. Unlike CS deassertion, HOLD maintains internal state and clock synchronization - allowing immediate resumption after HOLD returns high, even if SCK was paused mid-cycle. This is critical for crash-recording applications where power faults occur unpredictably.