Infineon Technologies S25FS128SDSNFI103

Overview

S25FS128SDSNFI103 from Infineon is a 128 Mb (16 MB) serial NOR flash memory IC with SPI Multi-I/O interface, 1.8 V supply, industrial temperature grade (–40°C to +85°C), and WSON 6 × 5 mm package. It supports Quad I/O, DDR Quad I/O read up to 80 MBps, 256-byte/512-byte page programming, and hardware ECC for single-bit error correction. Used in boot code storage for microcontrollers in industrial control systems.

For engineers reviewing the S25FS128SDSNFI103 datasheet, S25FS128SDSNFI103 pinout, S25FS128SDSNFI103 application, or S25FS128SDSNFI103 equivalent, key selection factors include hybrid/uniform sector erase options, SFDP/CFI support for auto-configuration, OTP array size, AEC-Q100 qualification status, and compatibility with legacy S25FL-P/S families.

Technical Context

This device implements SPI-MIO (Multi-I/O) architecture supporting standard SPI modes 0/3 and DDR operation, enabling high-speed burst reads in XIP mode. Its Eclipse-based MIRRORBIT™ 65-nm process delivers deterministic timing with 133 MHz clock capability for Quad read and 80 MHz for DDR Quad I/O.

The flash integrates dual-sector architecture: eight 4-KB + one 32-KB physical sectors at top/bottom plus uniform 64-KB blocks elsewhere, plus configurable block protection via status register bits and advanced sector protection with password-controlled access to OTP and protected regions.

Key Specifications

Pinout & Package

Package: WSON 6 × 5 mm, 8-pin, Pb-free, with exposed thermal pad (pin 8 = VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S25FS128SDSNFI103, the Cypress alternative trades DDR performance for broader legacy driver support, while the Winbond part offers QPI flexibility at the cost of missing DDR throughput and Infineon's Eclipse architecture power efficiency.

Availability

S25FS128SDSNFI103 is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS modules, medical imaging devices, and smart energy meters requiring stable component supply and long-term lifecycle assurance.

Supply support for S25FS128SDSNFI103 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, sensing, and memory solutions for industrial, automotive, and IoT applications.

The FS-S Flash product line targets high-reliability embedded systems requiring fast, secure, and configurable non-volatile storage with AEC-Q100 qualification and robust data integrity features.

FAQ

Is S25FS128SDSNFI103 pin-compatible with earlier S25FL-S series devices?

Yes - it maintains identical WSON 6×5 mm pinout and SPI command subset compatibility with S25FL-P and S25FL-S families. The CS#, SCK, SI/IO0, SO/IO1, WP#/IO2, and RESET#/IO3 pins map directly, enabling drop-in replacement where DDR mode is not utilized.

Does this part support execute-in-place (XIP) operation?

Yes - it supports continuous read mode for XIP execution from flash memory. The device allows uninterrupted instruction fetches during burst wrap reads, with timing guaranteed up to 133 MHz SDR or 80 MHz DDR Quad I/O, enabling direct CPU code execution without RAM loading.

What is the function of the RESET# pin during normal operation?

When not asserted, RESET# serves as IO3 in Quad I/O mode, expanding the data bus to four lines. During reset, it forces the device into hardware reset state, clearing internal registers and returning to standby mode - independent of CS# deassertion timing.

How is the 1024-byte OTP array accessed and protected?

The OTP array is accessed via dedicated One-Time Program Array commands (0x4B, 0x42). Once programmed, bits cannot be erased. Protection is enforced by status register lock bits and optional password authentication via Advanced Sector Protection commands, preventing unauthorized overwrite or read access.