Infineon Technologies S25FL256SAGMFM003

Overview

S25FL256SAGMFM003 from Infineon is a 256 Mb (32 MB) serial NOR flash memory with SPI Multi-I/O interface, designed for high-reliability military applications requiring extended temperature operation (-55°C to +125°C), hardware ECC, and dual/quad/DDR read modes. It supports 24- or 32-bit addressing, hybrid or uniform sector erase options, and delivers up to 80 MBps Quad DDR read throughput at 80 MHz clock rate with VIO = VCC = 3.0–3.6 V.

For engineers reviewing the S25FL256SAGMFM003 datasheet, S25FL256SAGMFM003 pinout, S25FL256SAGMFM003 application, or S25FL256SAGMFM003 equivalent, key selection criteria include military-grade temperature tolerance, on-die ECC support, programmable sector protection (OTP + ASP), hybrid vs. uniform erase configuration, and compatibility with legacy S25FL-A/K/P families via shared command set and footprint.

Technical Context

This device implements Infineon's 65-nm MIRRORBIT™ Eclipse architecture with dual-voltage operation: core supply (VCC = 2.7–3.6 V) and versatile I/O supply (VIO = 1.65–3.6 V), enabling interoperability with 1.8 V and 3.3 V host systems. Its SPI-MIO interface supports all four clock polarity/phase modes (0 and 3), plus DDR timing for doubled data rate efficiency.

The logic block includes integrated AutoBoot functionality-executing preconfigured Normal or Quad Read at power-up/reset-and Common Flash Interface (CFI) tables for runtime configuration discovery. Sector protection is enforced via Status Register bits, OTP array (1024 bytes), and Advanced Sector Protection (ASP) with boot-code or password control.

Key Specifications

Pinout & Package

Package: 24-ball FBGA (FAB024), 5 × 5 mm, Pb-free, compatible with standard reflow profiles for high-reliability assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial NOR flash applications.

Compared with S25FL256SAGMFM003, the WSON variant sacrifices I/O voltage independence and BGA thermal performance but eases assembly, while the Macronix part reduces cost and complexity at the expense of military temperature rating, ECC, and DDR throughput-making it unsuitable for safety-critical or high-bandwidth use cases.

Availability

S25FL256SAGMFM003 is available at Aetrix Electronics and suitable for aerospace flight control, defense radar signal processing, and tactical vehicle communication systems requiring stable component supply across extended product lifecycles and extreme environmental conditions.

Supply support for S25FL256SAGMFM003 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 German semiconductor manufacturer specializing in power management, automotive ICs, and high-reliability memory solutions for industrial, automotive, and defense markets.

The FL-S family targets military and aerospace applications demanding extended temperature operation, hardware ECC, and seamless migration from legacy S25FL devices-emphasizing data integrity, long-term retention, and secure firmware storage.

FAQ

Does S25FL256SAGMFM003 support both 24-bit and 32-bit addressing modes?

Yes, it supports extended addressing with configurable 24-bit or 32-bit address options. The mode is selected via Configuration Register bit CR3[0], enabling access to the full 256 Mb address space in 32-bit mode while maintaining backward compatibility with 24-bit legacy systems in hybrid sector configurations.

What is the purpose of the VIO pin, and can it operate independently from VCC?

VIO supplies power to the I/O buffer circuitry and can be set independently from VCC within 1.65 V to 3.6 V. This allows direct interfacing with 1.8 V microcontrollers without external level shifters, while VCC remains at 3.3 V to maintain core logic stability-critical for mixed-voltage system integration.

How does the AutoBoot feature function, and how is its target address configured?

AutoBoot executes a preselected Normal or Quad Read command automatically after power-up or hardware reset. The start address is stored in a dedicated 3-byte AutoBoot Address Register (AAR), programmable via standard SPI commands, and retained across power cycles-enabling immediate firmware fetch without host intervention.

Is the 1024-byte OTP array one-time programmable at the factory or in-system?

The OTP array is programmable in-system using standard SPI commands (e.g., Write Enable + Program OTP), but once a bit is set to '0', it cannot be reset to '1'. It is intended for storing immutable values like cryptographic keys, calibration data, or device identifiers during final test or field provisioning.