Infineon Technologies S25FS256SAGNFI001

Overview

S25FS256SAGNFI001 from Infineon is a 256 Mb (32 MB) serial NOR flash memory IC with SPI Multi-I/O interface, 1.8 V supply, and industrial-plus temperature grade (–40°C to +105°C). It supports Quad I/O, DDR Quad I/O read up to 80 MBps, 256/512-byte page programming, hardware ECC, and hybrid/uniform sector erase options. Used in boot code storage for edge AI gateways requiring fast XIP execution and long-term data retention.

For engineers reviewing the S25FS256SAGNFI001 datasheet, S25FS256SAGNFI001 pinout, S25FS256SAGNFI001 application, or S25FS256SAGNFI001 equivalent, key selection criteria include DDR Quad I/O bandwidth, AEC-Q100 Grade 2 qualification, 20-year data retention, OTP security, and BGA-24 FAB024/FAC024 footprint compatibility.

Technical Context

This device implements Infineon's Eclipse architecture with 65-nm MIRRORBIT™ technology, enabling simultaneous read-while-write via program/erase suspend-resume and burst wrap addressing for XIP. Its SFDP v1.6 and CFI support enable automatic configuration by host boot ROM without hard-coded timing parameters.

The SPI-MIO interface supports four I/O pins (IO0–IO3) with configurable roles including RESET# and WP#, allowing flexible command decoding across standard, dual, quad, and DDR modes. Configuration registers control sector protection granularity, OTP lock status, and voltage detection thresholds.

Key Specifications

Pinout & Package

Package: 24-ball BGA, 6 mm × 8 mm, 0.5 mm pitch (FAB024 footprint) or 4 × 6 ball array (FAC024 footprint), Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S25FS256SAGNFI001, the Infineon S25FS256SAGNFI010 offers identical performance with updated SFDP metadata, while Winbond W25Q256JWSIQ trades DDR bandwidth, ECC, and endurance for lower unit cost-making it viable only in non-safety, non-XIP use cases.

Availability

S25FS256SAGNFI001 is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLCs, 5G small cells, and medical edge gateways requiring stable component supply, long-lifecycle support, and AEC-Q100 qualification.

Supply support for S25FS256SAGNFI001 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, sensor, and memory solutions for automotive, industrial, and communications markets.

The FS-S Flash family targets high-reliability embedded systems requiring fast, secure, and long-life nonvolatile storage-specifically optimized for boot code, firmware, and configuration data in safety-critical and thermally demanding environments.

FAQ

What is the maximum clock frequency supported in DDR Quad I/O mode?

The S25FS256SAGNFI001 supports DDR Quad I/O operation at up to 80 MHz clock frequency, delivering 80 MBps effective read bandwidth. This is specified in the AC characteristics section (Table 6.5) of the datasheet and validated across the full –40°C to +105°C operating range with proper PCB layout and termination.

Does this part support hardware reset via the IO3 pin?

Yes, IO3 functions as active-low RESET# in standard SPI mode. Driving IO3 low for ≥20 µs initiates internal reset, clearing status registers and returning the device to standby state. This function remains available even when IO3 is reassigned as I/O3 in Quad mode, provided the host asserts reset before switching modes.

How is the 1024-byte OTP array protected from accidental overwrite?

The OTP array is permanently locked after first programming via Status Register Bit 7 (SRWD) and the Write Enable Latch (WEL). Once SRWD is set and WEL is cleared, no further writes-including erase or program commands-to any OTP byte are accepted. Lock status is verified by reading the OTP lock bits at address 0x00000400.

Can the S25FS256SAGNFI001 be used in place of S25FL256S without redesign?

No. Although both are 256 Mb SPI NOR flashes, S25FS256S uses Eclipse architecture with different SFDP parameter tables, erase suspend behavior, and OTP mapping versus S25FL256S's FL-S architecture. Pinout is identical, but firmware must be revalidated for command timing, status polling, and protection register usage.