Infineon Technologies S25FS128SAGMFB101

Overview

S25FS128SAGMFB101 from Infineon is a 128 Mb (16 MB) serial NOR flash memory IC with SPI Multi-I/O interface, operating at 1.8 V supply, supporting Quad I/O and DDR Quad I/O read modes up to 80 MBps, featuring 65-nm MIRRORBIT™ Eclipse architecture, 100,000 program-erase cycles, and industrial temperature range (–40°C to +85°C). It is used for firmware storage and code execution in embedded microcontroller systems requiring XIP capability.

For engineers reviewing the S25FS128SAGMFB101 datasheet, S25FS128SAGMFB101 pinout, S25FS128SAGMFB101 application, or S25FS128SAGMFB101 equivalent, key selection criteria include SPI-MIO timing compliance, hybrid/uniform sector erase flexibility, OTP array size (1024 bytes), ECC-enabled page programming, and AEC-Q100 grade 3 qualification for automotive control modules.

Technical Context

This device implements a SPI-MIO interface with configurable clock polarity/phase (modes 0 and 3), supports both SDR and DDR command protocols, and integrates Serial Flash Discoverable Parameters (SFDP) and Common Flash Interface (CFI) for runtime configuration discovery. Its internal ECC engine performs single-bit error correction during read operations without software intervention.

The flash array uses hybrid sector architecture - eight 4-KB sectors plus one 32-KB sector at top/bottom address space, with remaining sectors at 64 KB - enabling fine-grained firmware updates while maintaining compatibility with legacy 64-KB block erase tooling.

Key Specifications

Pinout & Package

Package: 8-pin WSON (6 mm × 5 mm, WND008), Pb-free, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S25FL128SAGMFI101 and W25Q128JVSIM, the S25FS128SAGMFB101 uniquely combines DDR Quad I/O bandwidth, on-die ECC, and OTP-based key storage - making it the only option meeting simultaneous requirements for high-speed XIP, functional safety, and cryptographic root-of-trust in industrial edge nodes.

Availability

S25FS128SAGMFB101 is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS ECUs, medical imaging devices, and smart energy meters requiring stable component supply with long-term lifecycle assurance.

Supply support for S25FS128SAGMFB101 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 renewable energy markets.

The FS-S Flash product line delivers high-reliability, low-voltage serial NOR flash optimized for real-time embedded systems requiring fast XIP, robust data integrity, and hardware-enforced security - especially in AEC-Q100 and IEC 61508 environments.

FAQ

What is the maximum supported clock frequency for DDR Quad I/O read operations?

The S25FS128SAGMFB101 supports DDR Quad I/O read at up to 80 MHz clock frequency, delivering 80 MBps effective throughput. This is specified in the AC characteristics section (Table 6.5) of the datasheet and validated across the full industrial temperature range. The device automatically configures internal timing paths when DDR mode is enabled via status register bit SR3[1].

Does this part support hardware reset via the IO3/RESET# pin?

Yes - the IO3 pin doubles as active-low RESET# input. When asserted, it forces the device into hardware reset state, clearing internal command queues and returning to default SPI mode without requiring power cycling. This function is electrically isolated from I/O operations and remains active even during deep power-down mode.

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 erased; protection is enforced by hardware - writing to already-set bits has no effect. Access requires prior Write Enable (0x06) and is blocked if Status Register Block Protection bits are set, preventing accidental overwrite during field firmware updates.

Can hybrid sector erase be mixed with uniform sector erase in the same device?

No - hybrid and uniform sector options are mutually exclusive configurations selected at manufacturing time and fixed per device. The S25FS128SAGMFB101 is configured for hybrid sector layout (eight 4-KB + one 32-KB sectors), and its erase commands (0x20, 0xD8) target only those physical geometries. Uniform 64-KB erase is not supported on this variant.