Infineon Technologies S25FS128SAGMFB103

Overview

S25FS128SAGMFB103 from Infineon is a 128 Mbit (16 MB) serial NOR flash memory with SPI Multi-I/O interface, operating at 1.8 V supply. It supports Normal/Fast/Dual/Quad/DDR Quad I/O read modes, 24-/32-bit addressing, hardware ECC, and hybrid/uniform sector erase options. Designed for boot code storage in industrial microcontroller systems requiring XIP capability and AEC-Q100 Grade 2 temperature operation (–40°C to +105°C).

For engineers reviewing the S25FS128SAGMFB103 datasheet, S25FS128SAGMFB103 pinout, S25FS128SAGMFB103 application, or S25FS128SAGMFB103 equivalent, key selection criteria include DDR Quad I/O read bandwidth (80 MBps), 100,000 program-erase cycles, OTP array size (1024 bytes), block protection granularity, and WSON 6 × 8 mm package compatibility with legacy S25FL-S footprints.

Technical Context

This device implements Infineon's Eclipse architecture with 65-nm MIRRORBIT™ technology, enabling true single-bit ECC correction and erase suspend/resume functionality. It supports both SDR and DDR SPI protocols across clock polarity modes 0 and 3, with configurable burst wrap and continuous XIP execution.

The flash integrates SFDP v1.6 and CFI for standardized configuration discovery, and uses dual-bank architecture to enable concurrent read-while-write operations. Sector protection is implemented via status register bits, hardware WP# pin control, and advanced password-protected ASP for individual sector lockdown.

Key Specifications

Pinout & Package

Package: WSON 6 × 8 mm (WNH008), 8-pin, exposed thermal pad, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S25FL128SAGMFI101, this part offers identical functionality with Infineon branding and updated lifecycle support; versus W25Q128JVSIM, it delivers 2.4× higher read bandwidth and mandatory ECC for safety-critical firmware integrity.

Availability

S25FS128SAGMFB103 is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC firmware deployment, and medical imaging system boot memory applications requiring stable component supply and long-term manufacturability.

Supply support for S25FS128SAGMFB103 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 IoT markets.

This device belongs to the FS-S Flash family, engineered for high-reliability embedded boot code storage with integrated security, ECC, and DDR performance in 1.8 V systems.

FAQ

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

The S25FS128SAGMFB103 supports DDR Quad I/O read operations at up to 80 MHz clock frequency, delivering 80 MBps effective bandwidth. This is specified in the AC characteristics section (Table 6.5) of the datasheet and validated across the full Industrial Plus temperature range. The device automatically configures DDR mode upon receipt of the appropriate command sequence and requires proper setup of the configuration registers prior to activation.

Does this part support hardware reset via the RESET# pin?

Yes, the RESET# pin (Pin 8) provides hardware reset functionality. When asserted low for ≥20 ns, it places the device into a known initial state, clearing internal command latches and aborting any ongoing program or erase operation. During normal operation, the pin serves as IO3 in Quad and DDR modes. An internal pull-up resistor maintains high state when unused, eliminating need for external biasing.

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

The OTP array is accessed using dedicated JEDEC-standard One-Time Program commands (0x4B and 0x42). Once programmed, bits cannot be reversed. Protection is enforced by status register lock bits and requires Write Enable before programming. The array resides at fixed address 0x00000000–0x000003FF and is write-protected after first programming unless unlocked via specific unlock sequence - a feature used for storing immutable cryptographic keys and device IDs.

Can this flash be used in a 3.3 V system?

No, the S25FS128SAGMFB103 is strictly a 1.8 V device with absolute maximum VCC rating of 2.0 V. Operation above 2.0 V risks permanent damage. It is incompatible with 3.3 V SPI buses and requires level-shifting circuitry or a dedicated 1.8 V supply rail. The datasheet explicitly defines operating range as 1.7 V to 2.0 V, and all AC/DC specifications are characterized within this window.